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Precision Computations
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1Pans-Ops PD Initial Course Circling
PRECISION APPROACH
GUIDANCE
ICAO FPP
Beijing, China
Pans-Ops PD Initial Course Circling 2
OAS Computation
Collection of all required data and maps
Computation of OAS template coordinates and surface equations.
W z= 0.0285 x 9.01
X z= 0.027681 x + 0.1825y 18.18
Y z= 0.023948 x + 0.210054 y 23.18
Z z= 0.025 x -22.5
Plotting of OAS surfaces upto 300m.
Pans-Ops PD Initial Course Circling 3
Selection of FAP Altitude
Selection of desired segment length
(say 5NM)
(5*6076*Tan 3)+50+26 = 1668 ft
~ 1700 ft
FAP Height above THR
1700/3.2808 8 = 510.2 m
Pans-Ops PD Initial Course Circling 4
Computation of of FAP Distance
(510.2-15) / Tan 3 = 9448.97 m
~ 9450 m
Width at FAP
X z= 0.027681 x + 0.1825 y 18.18
510.2 = 0.027681*9450+0.1825 y 18.18
y = (510.2+18.18-261.59)/0.1825
y = 1461.86 ~ 1462 m
Pans-Ops PD Initial Course Circling 5
Extension of Precision
FAP Height 510.2
Extension required = 510.2-150 = 360.2
(360.2-15) / Tan 3 = 6586.8 m ~ 6587 m Width at 6587
360.2= 0.027681 x + 0.1825 y 18.18
360.2=0.027681*6587+0.1825y 18.18
y = (360.2+18.18-182.34)/0.1825
y ~ 1074 m
Pans-Ops PD Initial Course Circling 6
Extension of Precision
W z=0.0285 x -9.01
360.2= 0.0285 x 9.01
x = (360.2+9.01)/0.0285
x ~ 12955 m
z= 0.027681 x + 0.1825 y 18.18
360.2= 0.027681*12955+0.1825y 18.18
Y ~ 108
Pans-Ops PD Initial Course Circling 7
Extension of Precision
C(316,51), C (10842,98)
D(-286,142), D(5438,918)
New C x = ((10842-316)*360.2/300)+316
= 12954.22
New C y = ((9851)*360.2/300)+51
= 107.43
New D x = ((5438+286)*360.2/300) 286
= 6586.6
New D y = ((918142)*360.2/300)+142
= 1073.7
Pans-Ops PD Initial Course Circling 8
Extension of Precision
New Limits
D (6587, 1074), C (12955,108)
Precision Surfaces may also be extended graphically just by computation of percentage increased required.
% Increase = 360.2*100/300 = 120.07%
Existing length 6 cm, New 7.2042
(Plotting Errors ?)
Pans-Ops PD Initial Course Circling 9
Assessment of OAS
Penetration Yes
Approach or Missed approach
Computation of equivalent for Missed App
Computation of OCHps
Determination of SOC position.
Is assessment of Basic ILS required ?
Pans-Ops PD Initial Course Circling 10
Missed Approach
Same as conventional
OCH adjustment computation, if required.
Pans-Ops PD Initial Course Circling 11
Questions