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Part 9-95 Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 1 of 22
Engineer Licences – Category Instruments
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft
Maintenance Engineer Licences – Category
Instruments
AAC Number Part 9-95
Issue Number Twenty Three
Date Amendment March 2011
This AAC contains information on the following topics applicable
to Aircraft Maintenance Engineer Licences –
Category Instruments:
1. Applicability
2. Definitions
3. Grouping Classifications
4. Licence Ratings and Form of Endorsement
5. Experience Requirements for the Grant of a Licence or Endorsement of a Rating
6. Examination Requirements
1. Applicability
This AAC specifies the requirements for the grant of an Aircraft Maintenance Engineer
Licence and the endorsement of additional ratings to a licence in the Instrument category.
It is to be read in conjunction with CAO Section 100.90 Issue 3 and the corresponding sub-
sections of CAO Section 100.95 Issue 4.
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 2 of 22
Engineer Licences – Category Instruments
2. Definitions
Inertial navigation and reference systems (covered by Instrument Group 9 rating [CASA
basic IK is required as a pre-requisite]) are those inertial navigation systems that initially
measure the six degrees of freedom. The six degrees of freedom measured are linear position
(x, y, z) and rotational attitude (pitch, yaw and roll). The CASA basic IK and Group 9 rating
are not required for licence coverage for Aircraft Heading and Reference Systems that may
well have inertial accelerometers but cannot be described as measuring the six degrees of
freedom. AHRS systems typically have rate gyros, magnetic compass or GPS inputs feeding
into a computer which calculates heading for display. AHRS systems are typically provided
licence coverage by the CASA Instrument Categories Aircraft General Instruments (Group
1) and Remote Indicating Compass Systems (Group 8). The same logic applies to Instrument
Group 20 aircraft, which may or may not have an inertial navigation and reference system
installed.
GPWS & TAWS Maintenance Privileges
Changes in terminology and advances to technology have caused questions to arise regarding
maintenance privileges for GPWS. Enhanced GPWS is a trademark owned by Honeywell -
but through general usage the term became synonymous with all of the Terrain Awareness
and Warning Systems (TAWS) that were available. TAWS is the standard terminology to be
used when describing GPWS systems with forward looking and predictive capabilities. The
table below provides some useful comparisons between the different systems available.
TAWS/GPWS Comparison
MODES/FUNCTIONS
TSO C92
GPWS
TSO C151 Class A TAWS
TSO C151 Class B TAWS
GPWS TAWS
Mode 1 Excessive Rate of Descent
Note 2
Mode 2 Excessive Closure Rate to
Terrain
Mode 3 Negative Climb Rate or
Altitude Loss After Take-Off
Note 2
Mode 4 Flight Into Terrain When
Not in Landing Configuration
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 3 of 22
Engineer Licences – Category Instruments
Mode 5 Excessive Downward Deviation From an ILS
Glide Slope
Forward Looking Terrain
Avoidance Function
Premature Decent Alert
Function
Terrain Awareness
Display
Note 5
Voice Callout 'Five Hundred'
Note 3
Note 4
Notes:
1. The Federal Aviation Administration currently requires that TSO C151 Class B
equipments be limited to aeroplanes with nine passenger seats or less (TSO C-151 Appendix
1 Table 11-1). CAO 20.18 does not require an aeroplane with less than ten seats to carry
GPWS.
2. Class B equipment will not require a radio altimeter. Height above terrain may be
determined by subtracting the elevation of the current position terrain cell from the current
barometric altitude (or equivalent).
3. When the aeroplane descends to 500 ft above the terrain or nearest runway elevation.
4. When the aeroplane descends to 500 ft above the nearest runway elevation.
5. Class B must be capable of driving an optional display.
Composite Indicators Maintenance Privileges
A question that often arises is due to the fact that some GPWS and TAWS have composite
indicators. A 'composite indicator' (defined in CAO 100.90 as; ’an indicator which receives,
processes and/or displays information to and from both instrument and radio systems’.) is
prime category for both category Radio (section 4.1 of appendix 1 to CAO 100.90) and
category Instruments (section 6.1 of appendix 1 to CAO 100.90).
This means is that either category can maintain the indicator - but it would depend on the
nature of the maintenance who should in any particular situation. If the indicator is to be
replaced due to failure of a radio system display - then category radio; failure of an
instrument system display - then category instruments, for total failure, either category.
Subsequent release-to-service may be certified by the category of LAME who can meet the
requirements of the SoM/AMM for testing of the indicator. If other systems are needed to be
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 4 of 22
Engineer Licences – Category Instruments
operated to perform the composite indicator test, then it may be both categories depending on
those related system requirements. On the other hand, if the test can be done by only one
category, then that category. The instrument category GPWS and TAWS maintenance
privileges do not extend to the radio inputs.
Terrain Awareness Warning System (TAWS) Maintenance Privileges.
The two common categories of TAWS are Class A and Class B. Class A TAWS is the
enhanced version of GPWS and always has a display. Class B TAWS has less modes and
functions than GPWS/Class A TAWS eg it is not fed any radar altimeter inputs and may or
may not have a display.
Class A & B TAWS are thus treated like any GPWS and are primarily an instrument
category system. The radio category has maintenance privileges for the radio inputs and
composite indicators as explained above. Radio inputs and thus radio category privileges can
extend to circuit cards with a radio category function.
TAWS B systems all have the capability to feed into an instrument for display or warning
purposes. If the display/warning capability is utilised the system is termed to be a TAWS-B+
system as per CAO 20.18. If the TAWS B+ system feeds a composite indicator then both the
radio and instrument categories have maintenance privileges as explained above.
Database Maintenance Privileges
The database for a TAWS may exclusively reside within the TAWS or it may be resident
within an affiliated/interconnected system.
If the database were to be housed within the TAWS eg Honeywell EGPWS then the update
of that database would be primarily an instrument category privilege.
If the database utilised by a TAWS was that of an interconnected instrument system eg a
FMS then the update of the database would be primarily an instrument category privilege.
If the database utilised by a TAWS was that of an interconnected radio system eg a GPS then
the update of he database would be primarily a radio category privilege.
Further definitions are contained within CAO 100.95 sub-section 2.
3. Grouping Classifications
Instruments category groups are specified in CAO Section 100 95 Issue 4.
Reference should be made to Table 1 of sub-section 4 of this AAC which lists those aircraft
classified Instruments Group 20.
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 5 of 22
Engineer Licences – Category Instruments
4. Licence Ratings and Form of Endorsement
Endorsements of ratings will take the forms as listed in CAO 100.95 Issue 4 para 4.5. Where
a credit for Examination QE is not held the licence shall be endorsed; “ratings held within
this category are limited to non-digital systems only”.
Those aircraft classified as Group 20 are listed in Table 1 below. Endorsements on the
licence are computer generated from tables maintained centrally by Maintenance Personnel
Section. The endorsements will follow as closely as possible the endorsements shown
below.
Form of Licence Endorsement for Aircraft Classified as Category Instruments -
Group 20 - Table 1
AIRCRAFT TYPE LICENCE ENDORSEMENT
Aerospatiale SA330 SA330
Aerospatiale SA332 SA332
Airbus A300 B4 - 200 A300-B4
Airbus A300 B4 - 600/Airbus A310 A300-600/310
Airbus A319/A320/A321 A319/320/321
Airbus A330-200/300 A330-200/300
Airbus A380 A380
AMD Falcon 10/20 AMD F10/20
AMD Falcon 50 AMD F50
AMD Falcon 200 AMD F200
AMD Falcon 900 (excluding 900EX) AMD F900
AMD Falcon 900EX (Note 3) AMD F900EX
ATR 42-200/300 ATR 42
ATR 42-400/500 ATR 42 PEC
Agusta Westland 139 AW139
Avro 146-RJ70/85/100 (Note 6) Avro 146-RJ
BAe HS 748 HS 748
BAe (BH/HS) 125 - 3B/400/600/700 BAe 125 Series to 700
BAe 125 800/Hawker 750/800/850/900
including XP
BAe 125-800/900
BAe 125 1000/Hawker 1000 BAe l25-l000
BAe l46 100/200/300 BAe l46 Series
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 6 of 22
Engineer Licences – Category Instruments
Form of Licence Endorsement for Aircraft Classified as Category Instruments -
Group 20 - Table 1
AIRCRAFT TYPE LICENCE ENDORSEMENT
Beechjet 400A Beechjet 400A
Bell 2l4ST Bell 2l4ST
Boeing 707 - 300 B707-300
Boeing 717-200 B717 Series
Boeing 727 - l00/200 B727-l00/200
Boeing 737-100/200 B737-100/200
Boeing 737 - 300/400 B737-300/400
Boeing 737-600/700/700IGW/800/900 B737-600/700/800/900
Boeing 747 - l00/200/300/SP B747Series
Boeing 747-300 Life Extension B747-300 LE
Boeing 747 – 400 and –400 (910K) note 1 B747-400
Boeing 757 - 200 B757-200
Boeing 767-200/300 B767-200/300
Boeing 777-200/300 B777-200/300
Bombardier Challenger CL 300 Bombardier CL-300
Canadair/Bombardier BD-700 (Global
express)
BD-700
Canadair/Bombardier CL215 CL-215
Canadair/Bombardier CL600/601/604/605 CL600-Series
Canadair Regional Jet 100/200 Series CRJ 100/200 Series
CASA 212-400 CASA 212-400
Cessna 500/501/550/560/560XL/560XLS/S2 C500/550/560/560XL
Cessna 510 Mustang C510
Cessna 525 (SPZ5000 Instrument Suite) C525 Series (SPZ5000)
Cessna 525/525A/525B (Proline 21 Instrument
Suite )
C525 Series (Proline 21)
Cessna 650 C650
Cessna 680 C680
Cessna 750 Cessna 750
Convair 240 Convair 240
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 7 of 22
Engineer Licences – Category Instruments
Form of Licence Endorsement for Aircraft Classified as Category Instruments -
Group 20 - Table 1
AIRCRAFT TYPE LICENCE ENDORSEMENT
Convair 340 Convair 340
Convair 440 Convair 440
Convair 580 (Allison 501) Convair 580
Dassault F 2000 and F2000EX EASy Dassault F2000
De Havilland Canada DHC-7 DHC -7
De Havilland Canada DHC-8 (Excludes 400) DHC-8-100/200/300
De Havilland Canada DHC-8-400 DHC-8-400
Dornier 328 (excluding 328-JET) Dornier 328
Eclipse 500 Eclipse 500
Eurocopter EC225 EC225
Embraer 120 EMB l20
Embraer 135/145 EMB 135/145
Embraer ERJ 170.100 STD & ERJ 170.100
LR
ERJ 170
Embraer ERJ 190.100 ERJ 190
Embraer 500 (Phenom) EMB 500
Fokker F27-MK050 (F-50; Fokker 50) F27-MK050
Fokker F27-l00/200/400/500/600/700 F27 Series
Fokker F28-l000/3000/4000 F28 Series
Fokker F28-MK100 (F-100; Fokker 100) F28-MK100
Grumman Gl59 Gl59
Grumman Gll59 Gll59
Grumman GIV G-IV
Gulfstream 200/IAI Galaxy G200
Gulfstream GIV-X/G450/G350 Gulfstream GIV-X/G450/G350
Gulfstream GV (except GV-SP) GV
Gulfstream GV-SP (500& 550) GV-SP
IAI Westwind 1124 IAI-1124
IAI Astra 1125 IAI-1125
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 8 of 22
Engineer Licences – Category Instruments
Form of Licence Endorsement for Aircraft Classified as Category Instruments -
Group 20 - Table 1
AIRCRAFT TYPE LICENCE ENDORSEMENT
IAI Astra 1125 SPX IAI-1125 SPX
Jetstream 4100 Jetstream 4100
Learjet-24D/24F/25B/25C/31/35/35A/36/36A GL-20/30
Learjet 31A GL-31A
Learjet 45 GL-45
Learjet 55 GL-55
Learjet 60 GL-60
Let L410 and Let L420 Let L420
McDonnell Douglas DC-9-30 DC9-30
McDonnell Douglas DC-9-81/82/83
(MD81; MD82; MD83)
DC9-81/82/83
Raytheon 390 (Premier 1) Raytheon 390
Saab SF340 SF340
Sikorsky S61 S61 Series
Sikorsky S76 S76
Sikorsky S92 S92
Note 1: The –400 (910K) refers to the B747-438 aircraft fitted with the auxiliary fuel tank
in the forward cargo compartment and introduced into the Qantas fleet late 2002. This
aircraft has other modifications that have allowed the aircraft to operate at a higher
MTOW of 910,000 lbs.
Note 2: Lancair aircraft are now manufactured by Lancair in kit form and by Columbia as
complete certificated aeroplanes.
Note 3: Holders of an AMD 900 rating in the instrument category need only to supply SOE
in chapters 22 and 34 (navigation) appropriate to the AMD 900EX to be eligible for the
rating.
Note 4: Where a S76 instrument rating has a limitation applied to a specific autopilot
system fitted, the limitation applies only to the autopilot system and associated
components.
Note 5: A S76 instrument rating with the SPZ7600 limitation also allows certification for
the SPZ760 and SPZ7000 systems fitted to the S76.
Note 6: Holders of an Avro 146-RJ70 rating may certify for the Avro 146-RJ70/85/100
only after completing the appropriate CAR 214 training. Licence endorsements will be
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 9 of 22
Engineer Licences – Category Instruments
Form of Licence Endorsement for Aircraft Classified as Category Instruments -
Group 20 - Table 1
AIRCRAFT TYPE LICENCE ENDORSEMENT
updated at licence renewal.
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 10 of 22
Engineer Licences – Category Instruments
5. Experience Requirements for the Grant of a Licence or
Endorsement of a Rating
The minimum experience time period required for the grant of a licence is four years aircraft
maintenance or aircraft component maintenance. The four years maintenance experience
includes two years aircraft maintenance experience in the category being applied for.
In addition to the four general and two years category experience, the applicant also needs to
have satisfied the Schedule of Experience (SOE) requirements for the Group being applied
for. The minimum practical experience required for the grant of a licence or the endorsement
of an additional rating is specified as follows:
(a) For aircraft classified as Group 20 the minimum practical experience is specified
within this AAC (Table 2) and in a document published by CASA titled
“Schedule Of Experience Instrument 20." Minimum practical experience
requirements may also be specified within an approved Accelerated Training or
Practical Consolidation Training (PCT) Program.
(b) For instrument systems classified Groups 1, 3, 5, 7, 8, 9 and 10 the minimum
practical experience is specified within this AAC (Table 4) and in a document
published by CASA titled “Schedule Of Experience Instrument 1, 3, 5, 7, 8, 9
and 10" (Form 919).
If the information within the AAC is found to conflict with that provided within SOE
documents then the AAC is to be taken as the authoritative document. The experience
reductions detailed within the tables are only a guide to the assessing AWI. If the complexity
of an aircraft or aircraft group being used as the basis for a reduction is not comparable to the
aircraft or aircraft group being sought, then the AWI may vary the experience reduction
applied accordingly. Because of these uncertainties LAME’s are encouraged to have their
particular situation assessed by an AWI prior to compiling their SOE.
Only central office AWI may assess SOE reductions applicable to:
(a) Competency Technical Category applicants (overseas & current/discharged
military personnel who have been employed as aircraft engineers);
(b) accelerated training program applicants; and
(c) practical consolidated training applicants.
When determining the minimum hours an individual will require for a Group 20 instrument
rating, reference is to be made to Tables 1 and 2. Table 1 titled “Schedule Of Experience
Complexity Comparison For Group 20", lists aircraft types that are considered to be of
similar complexity. Applicants should first consult this table to establish which “List"
includes the aircraft for which they seek a rating. Following this, applicants should consult
Table 2 titled “Instrument Base Hours Requirement”. The appropriate hours in Table 2 are
then transcribed into the SOE.
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 11 of 22
Engineer Licences – Category Instruments
For the grant of an additional Group 20 Type rating, the minimum hours set out in Table 2
may be reduced. Refer to Table 3 titled “Rating Reduction” to identify the reduction that
may be claimed.
When determining the minimum hours an applicant will require for Groups 1, 3, 5, 7, 8, 9
and 10 instruments rating, reference is to be made to Tables 4 and 5. Table 4 provides
applicants the base hours required and Table 5 provides applicants with reductions that may
be applicable to their own situation.
However, it should be noted that the final decision to grant a reduction rests
with the airworthiness inspector at the time of processing the licence
application.
Practical experience in the Instrument Category may be gained concurrently with experience
in the Electrical and/or Radio Categories.
Section 5 - Table 1 - Schedule of Experience Complexity Comparison for Group 20
Aeroplanes List 1 Aeroplanes List 2 Aeroplanes List 3 Helicopters List 1
AMD F10/20 A300-B4 A319/320/321 AW139
AMD F200 A300-600/A310 A330-200/300 Bell 214 ST
AMD F50 Avro 146-
RJ70/85/100
A380 EC225
AMD F900 B707-300 B737-600/7/8/9 SA330
AMD F900EX B717-200 B777-200/300 SA332L Series
ATR 42-200/300 B727-100/200 ERJ 170 S61 Series
ATR 42-400/500 B737-100/200 ERJ 190 S76
BAe 125-Series to
700
B737-300/400 S92
BAe 125-
800/Hawker 800/900
B747-Series
BAe 125-
1000/Hawker 1000
B747-400
BAe 146 Series B757-200
BD-700 B767-200/300
Beechjet 400A CRJ 100/200 Series
C500/550/560XL DC9-30
C510 Mustang DC9-81/82/83
C525 EMB 135/145
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 12 of 22
Engineer Licences – Category Instruments
Section 5 - Table 1 - Schedule of Experience Complexity Comparison for Group 20
Aeroplanes List 1 Aeroplanes List 2 Aeroplanes List 3 Helicopters List 1
C650 F28 Series
C680 F28-MK 100
C750 B747 (LE)
CL300
CL600/601/604/605
CASA 212-400
Convair 240
Convair 340
Convair 440
Convair 580
Dassault F2000
DHC-7
DHC-8-100/200/300
DHC-8-400
Eclipse 500
Dornier 328
EMB 120
EMB 500
F27 Series
F27-MK050
G-IV
GV
GV-SP
G129
G1159
G200
GIV-X/G450/G350
GL-20/30 Series
GL-45
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 13 of 22
Engineer Licences – Category Instruments
Section 5 - Table 1 - Schedule of Experience Complexity Comparison for Group 20
Aeroplanes List 1 Aeroplanes List 2 Aeroplanes List 3 Helicopters List 1
GL-55
GL-60
HAMC Y12(II)
HS 748
IAI-1124
IAI-1125 & IAI-
1125
Jetstream 4100
Let L420
MU300/Beechjet
400
Raytheon 390
SF340
Section 5 - Table 2 - Instrument Base Hours Requirement
ATA Chapter
Area
Helicopters
List 1
Aeroplanes
List 1
Aeroplanes
List 2
Aeroplanes
List 3
21 15 (#4) 15 30 10
22 100 100 100 50
24 10 * 10 * 20 * 20 *
27 -- 15 20 10
28 10 20 30 10
29 5 * 10 * 10 * 10 *
31 10 40 55 20
34 100 100 100 50
35 -- 20 20 20
36 5 (#4) 5 10 10
49 -- 10 * 10 * 10 *
77 to 79 10 10 10 10
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 14 of 22
Engineer Licences – Category Instruments
* Denotes total hours applicable to Instrument or Electrical category.
Note 2: No more than 50% of any ATA chapter area requirement specified in this AAC can
be met by the inclusion in the SOE of checks/inspections carried out as a result of ATA 5-
20 or ATA 5-50.
Note 3: Relevant maintenance simulator training, limited to 20% of the total hours in any
task area, may be accepted as appropriate experience. If a reduced requirement has
already been applied, then only 10% of the total hours for any task area would be allowed.
Note 4: SOE requirement only applies if the system is fitted to the aircraft.
This table denotes the percentage reduction in the SOE base hour requirements applicable
when applying for a Group 20 instrument rating.
Section 5 - Table 3 - Rating Reduction
Seeking Instrument Type Ratings Reduction
1st aircraft instrument type rating Nil
2nd aircraft instrument type rating 25%
3rd aircraft instrument type rating 50%
4th & subsequent aircraft instrument type rating 75%
Note 1: The above table represents the general reductions that may be claimed by
applicants applying for aeroplane or helicopter instrument ratings. This table is not
designed to account for the “ifs, buts and what abouts”. If a person believes that they
should have a different reduction to that normally available via the table, then the person
must refer to paragraph 3.10 of the Schedule of Experience and make representation
accordingly.
Note 2: Paragraph 3.10 of the Schedule of Experience provides for SOE reduction if an
applicant believes that the hours for a particular ATA chapter represents an onerous task.
Onerous tasks include:
those that cannot be easily satisfied due to inherent reliability of systems and
equipment; and
those that the applicant believe they have already satisfied via experience on systems
and equipment which are closely allied to those being applied for.
A claim for a reduced experience requirement (beyond that provided by Table 3) may also
be based on the evidence provided by previously submitted SOE. Any application for a
reduction in SOE requirements should be submitted as soon as possible after obtaining the
SOE.
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 15 of 22
Engineer Licences – Category Instruments
Section 5 - Table 3 - Rating Reduction
Note 3: Where an aircraft is of the same basic type but different dash number, they will be
treated as one (1) rating for the purposes of the Rating Reduction Table 3.
Note 4: The holder of an Instrument licence rated Group 1 applying for a Group 20
aircraft rating may be granted a 20% reduction from the hours required in Table 2. This
reduction is in addition to the reduction specified in this table to a maximum of 75%. The
reduction is limited by ATA chapter dependent on other lower group instrument ratings
held. ATA chapter grant is limited as follows:
ATA 21 Airconditioning/Pressurisation – Group 10 required
ATA 22 Autoflight – Group 5 or 7 required
ATA 34 Navigation Systems (instrument) Group 8 required
Note 5: CASA has historically delineated between helicopter and aeroplane ratings when
determining allowable SOE reductions. This delineation is no longer being made by CASA;
however, the applicant for SOE reduction must have experience in all applicable ATA
chapters of the rating being applied for the reduction to be granted. eg the holder of a
group 20 instrument helicopter rating may or may not have air conditioning/pressurisation
experience, such a person would still need to get full SOE in ATA Chapter 21.
Note 6: The maximum reduction in SOE base hours is 75% unless specifically stated.
Section 5 - Table 4 – Lower Groups Instruments Base Hours Requirement
Group Experience Task Area Full
Hours
Group 1
General Instrument
Systems
Scheduled Maintenance
Gyroscopic Instruments, Oxygen and Pneumatic
Systems
Engine Instruments & Engine Indicating Systems
Direct Reading Compasses (minimum 6
calibrations)
Fuel Indicating Systems (minimum 6 calibrations)
Pitot Static & Associated Instruments & Systems
(minimum of 6 pitot-static leak tests)
100 hours
50 hours
40 hours
15 hours
15 hours
50 hours
Group 3
Autopilots/Flight
Directors Single Axis
Autopilots/Flight Directors Single Axis
40 hours
Group 5
Autopilots/Flight
Directors Multi Axis
Autopilots/Flight Directors Multi Axis 60 hours
Group 7
Autopilots/Flight
Directors Helicopters
Autopilots/Flight Directors Helicopters 60 hours
Group 8
Remote Indicating
Remote Indicating Compass Systems
(minimum of 2 calibrations)
30 hours
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 16 of 22
Engineer Licences – Category Instruments
Section 5 - Table 4 – Lower Groups Instruments Base Hours Requirement
Group Experience Task Area Full
Hours
Compass Systems
Group 9
Inertial Navigation and
Inertial Reference
Systems
Inertial Navigation and Inertial Reference Systems 25 hours
Group 10
Pressurisation Systems
Pressurisation Systems 25 hours
Section 5 - Table 5 – Lower Groups Instrument Rating Reductions
This table denotes the percentage reductions in the SOE base hours requirement, which is
applicable when applying for a lower Instrument Group rating.
Rating Held Group Experience Sought
1 3 5 7 8 9 10
Inst Group 3 30%
Note 4
Inst Group 5 100%
Note 4
50%
Inst Group 7 50% 50%
Inst Group 20 80% 80% 80% 80% 80% 80% 80%
Airframe Group 10 100%
Airframe/Engine 10%
Note 1: Only Holders of Group 20 types that have systems relating to the group sought
may be granted the reduction.
Note 2: Holders of an engine and/or airframe licence may be granted a reduction of 10%
in the hours required for each of the Group 1 task areas.
Note 3: Relevant maintenance simulator training, limited to 20% of the total hours in any
task area, may be accepted as appropriate experience. If a reduced requirement has
already been applied then only 10% of the total hours for any task area would be allowed.
Note 4: Experience claimed in gaining a Group 5 rating may be counted towards the
experience required for a Group 3 rating. An applicant who is using Group 3 experience
towards a Group 5 rating has a 30% reduction in the SOE requirement for Group 5
systems.
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 17 of 22
Engineer Licences – Category Instruments
This table denotes the percentage reduction in the SOE base hours requirement
Section 5 – Table 6 - Rating Reduction - Holder of Group 20 Airframe / Engine
Categories converting to an initial Group 20 Instrument Rating for a given
Type Rating
ATA
Chapter
Topic Area Reduction available Focus for
Remaining SOE
21-
(30/31)
Airconditioning General
Pressurisation Systems
25% Indication and
control
22 Autoflight Systems 25% Indication and
control
24 Electrical Power 25% Indication and
control
27 Flight Control Systems - Stall
Warning
50% Indication and
control
28 Fuel Systems 50% Indication and
control
29 Hydraulic Power 50% Indication and
control
31
31-31
31-60
Indicating & Recording Systems
Air Data System
Pitot Static System
Clocks
Flight Data Recorder
EFIS EICAS
25%
34
Navigation Systems:
General
Radio Interface
ACARS, SELCAL, LARP,
INS/IRS
Compass
Flight Management System
Ground Proximity Warning
TCAS
25%
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 18 of 22
Engineer Licences – Category Instruments
Section 5 – Table 6 - Rating Reduction - Holder of Group 20 Airframe / Engine
Categories converting to an initial Group 20 Instrument Rating for a given
Type Rating
ATA
Chapter
Topic Area Reduction available Focus for
Remaining SOE
35 Oxygen Systems:
Passenger/ Crew
100%
36 Pneumatic Systems 25% Indication and
control
49 APU 50% Indication and
control
77-79 Engine Indicating Systems Oil
Systems
50% Indication and
control
6. Examination Requirements
This section details the examinations required to be passed prior to the issue of a licence or
endorsement of additional ratings in the instrument category.
Section 6 – Table 1 - Examination Requirements
EXAMINATION CODE LICENCE GROUPS
1 3 5 7 8 9 10 20
Core Subjects
Airworthiness Administration AA * * * * * * * *
Electrical Fundamentals QA * * * * * * * *
Aerodynamics and Maintenance
Practices
QB * * * * * * * *
Basic Logic and Semi-
conductor Theory
QC * * * * * * * *
AC Theory and Power Systems QD * * * * * * * *
Digital Techniques, Computer
and Electrical Devices
QE ** ** ** ** ** ** ** **
Specific Group Subjects
Aircraft General Instruments - I IA * * * * * * * *
Aircraft General Instruments - II IZ * * * * * * * *
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 19 of 22
Engineer Licences – Category Instruments
Section 6 – Table 1 - Examination Requirements
EXAMINATION CODE LICENCE GROUPS
Single Axis Radio Coupled
Autopilots/Flight Director
ID * #
Multi-Axis Radio Coupled
Autopilot/Flight Directors
IF * #
Helicopter Autopilot/Flight
Directors
IH * #
Remote Indicating Compass
Systems
IJ * #
Inertial Navigation and Inertial
Reference Systems
IK * #
Pressurisation IM * #
Specific Group
Written IS #
Oral IO #
* Denotes the prerequisite examinations to be passed for each group of type.
# Denotes the examinations to be passed for Group 20 as applicable.
** Denotes a credit for examination QE is only necessary where certification is required
for a system classified as digital in accordance with sub-section 2 of CAO Section 100.95
issue 4 or for the initial issue of a licence after 1 July 1989.
Note 1: A separate specific type examination (IS) is required for each additional rating in
group 20.
Note 2: The written examination IS will only be available for Group 20 aircraft NOT
classified high capacity should a mandatory training course acceptable to the Authority
as required in CAO 100.95 para 5.2 not be available.
Note 3: An applicant for Group 20 must hold examination credits for all those groups
which form the specific aircraft installation concerned.
Note 4: Where an aircraft in Group 20 is considered by the Authority to be sufficiently
similar to an aircraft for which a rating is held, IS becomes IO.
Note 5: Applicants who hold an examination credit for IF may be granted exemption from
examination ID.
Note 6: Applicants who have not qualified or have not been granted a credit with respect
to examination QE will have their licences endorsed accordingly, ie, “ratings held within
this category are limited to non-digital systems only” This limitation will be lifted upon
passing examination QE. The endorsement will be made in section xiii of the licence.
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 20 of 22
Engineer Licences – Category Instruments
Section 6 – Table 1 - Examination Requirements
EXAMINATION CODE LICENCE GROUPS
Note 7: After 1 July 1989 a pass in examination QE will be required prior to the initial
issue of a licence in the instrument category.
Note 8: A credit for examination QB may be granted to a person who holds credit for
examinations BA, BB and BC.
Note 9: The requirement for a pass in examination IZ will be effective from 1 July 1989.
(Prior to 1 July 1989, IA incorporated IZ).
Note 10: A specific type oral examination IO is also required for each rating in Group 20
where the practical experience for that rating is gained within an approved Practical
Consolidation Training (PCT) Program.
Mandatory Training Courses - Group 20
As specified in paragraph 5.2 of CAO Section 100.95 Issue 4, all applicants for a Group 20
Instrument rating, for aircraft classified Group 20 and listed in Table 1 of sub-section 4 of
this AAC, are required to have successfully completed a relevant training course acceptable
to the Authority as a prerequisite to gaining the rating.
For a variety of reasons courses and/or examinations may not be available to personnel who
are trying to gain a type course examination credit. CASA no longer allocates resources to
the maintenance, update or delivery of Group 20 Specific Type examinations. Aircraft type
training is an activity that CASA believes should be commercially delivered.
Situations may arise where AME are unable to access type course training and associated
examination credit. AME so affected are encouraged to contact CASA so that the
individual’s particular circumstances can be reviewed.
Should an aircraft not be listed, then one of the following applies:
(a) A training course acceptable to the Authority is available.
(b) The aircraft is not on the Australian register and no CASA examination will be
provided; or
(c) The aircraft has just been placed on the Australian register. Therefore, the
candidate should contact the Authority to ascertain if the Authority is able to
provide the examination.
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 21 of 22
Engineer Licences – Category Instruments
Waiver of Mandatory Specific to Type Instrument Training Course Requirements –
Instrument Group 20
CASA recognizes that some Group 20 Aircraft (mainly Corporate Jet) have instruments fits
that are substantially the same for different aircraft types. The CASA approved courses for
such aircraft are often comprised of two sections – a general aircraft type course and a
specific to type instrument course.
If a LAME holds a Group 20 instrument category rating, pertaining to a particular instrument
fit e.g. Collins Proline 21, and wants to gain a subsequent Group 20 instrument rating on an
aircraft with the same instrument fit, that LAME may apply to Maintenance Personnel
Licensing for recognition of that rating.
Whilst the applicant would still be expected to complete the general aircraft type course it is
possible that the specific to type instrument course training requirement would be waived.
Possible MPL determinations include:
Grant of IS upon completion of the general aircraft type course; and
Schedule of Experience reductions.
The following Table is for historical purposes only as CASA no longer carries
out Specific Type Examinations
Instrument - Group 20 Specific Type Examinations and Examination
Codes - Table 2
EXAMINATION DESCRIPTION CODE
AIRCRAFT TYPE PART 1 PART 2
Aerospatiale SA 330 IS001 Nil
AMD Falcon 10/20 IS003 IS004
AMD Falcon 50/200 IS005 IS006
AMD Falcon 900 IS007 IS008
BAe (BH/HS) 125-
3B/400/600/700/800
IS053 IS054
Bell 214ST IS055 Nil
Canadair CL600/601 IS101 IS102
Cessna 500/550/560 IS103 IS104
Cessna 650 IS105 IS106
Gates Learjet 20/30 Series IS241 IS242
Gates Learjet 55 IS243 IS244
Airworthiness Advisory Circular (AAC)
Administration and Procedure – Aircraft Maintenance Engineer
Licences – Category Instruments
Part 9-95, Issue 23 – March 2011 Administration and Procedure – Aircraft Maintenance Page 22 of 22
Engineer Licences – Category Instruments
Instrument - Group 20 Specific Type Examinations and Examination
Codes - Table 2
EXAMINATION DESCRIPTION CODE
AIRCRAFT TYPE PART 1 PART 2
Grumman G159 IS245 IS246
Grumman G1159 IS247 IS248
IAI Westwind 1124 IS311 IS312
Saab SF340 IS541 IS542
Sikorsky S76 IS545 Nil