Embed Size (px)
Citation preview
C172 Performance
Aim
To determine take-off and landing distances using flight manual data for the Cessna 172SP
Objectives1.Calculate Take Off Distance Required for C172SP2.Calculate Landing Distance Required for C172SP3.Practice problems4.State TEM, Airmanship, and Human Factors
considerations
1. Calculate TODR – 172SPTODR - C172SP
These tables can be found in the aircraft flight manual. We use these tables to work out take-off distances for the C172SP
This data is only true when the aircraft is flown to the prescribed conditions
TODR - C172SPCalculate TODR given the following information:
Aerodrome: YBAS
ATIS: YBAS H 042322 RWY: 30WIND: 330/18VIS: WX: CAVOK + CLD: TMP: 29 QNH: 1005
Weight: 1157 Kg (2550 lbs)
1. Calculate TODR – 172SP
TODR - C172SPWe can start by gathering the relevant information from the ERSA
Elevation: 1789ft
1. Calculate TODR – 172SP
TODR - C172SPWe can start by gathering the relevant information from the ERSA
Elevation: 1789ftTODA: 8983ft (2738m)Slope: 0.3% up
1. Calculate TODR – 172SP
TODR - C172SPFill out the W&B + Performance form with the known data
To determine pressure height:1. Determine pressure variation from
ISA1013 hPa – 1005 hPa = +8hPa
2. Multiply variation by the pressure lapse rate, 30ft per 1 hPa
+8 hPa x 30ft = +240ft3. Apply the variation to the
aerodrome altitudeSince QNH is less than ISA, pressure altitude will be
higher1789ft + 240ft = 2029ft
YBAS
30
2029ft1005 hPa
29⁰C330/18
Bitumen0.3% up2550 lbs
8983ft
1. Calculate TODR – 172SP
TODR - C172SPYBAS
30
2029ft1005 hPa
29⁰C330/18
Bitumen0.3% up2550 lbs
8983ft
Determine Wind Components:
Crosswind Component = 9kts
Headwind Component = 17kts
H17/X09
1. Calculate TODR – 172SP
TODR - C172SP
Once we have gathered all the relevant data we can then go to the performance charts to determine our TODR
Our pressure height was 2029ft, temperature 29⁰C, so we must interpolate between 2000ft and 3000ft for 20⁰C and 30⁰C
2240ft – 2035ft = 205ft205ft / 1000 = 0.2050.205 x 29 = 6ft2035ft + 6ft = 2041ft
2420ft – 2190ft = 230ft230ft / 1000 = 0.230.23 x 29 = 7ft2190ft + 7ft = 2197ft
Take-off Distance - Tables
1. Calculate TODR – 172SP
TODR - C172SP
Take-off Distance - TablesOur pressure temperature was 29⁰C so we must interpolate between 2197ft and 2041ft
2197ft – 2041ft = 156156ft / 10 = 15.615.6 x 9 = 140ft2041ft + 140ft = 2181ft
1. Calculate TODR – 172SP
TODR - C172SP
Take-off Distance - TablesOur headwind wind component was 17KTS so we must decrease our TODR
17 / 9 = 1.9Therefore we can decrease our TODR by 19%2181ft x 0.81 = 1767ft
1. Calculate TODR – 172SP
TODR - C172SPThis chart does not factor in CAO 20.7.4 so we must increase this value by 15%
1767 x 1.15 = 2032ft
We then enter the TODR into the W&B + Performance form and compare it to our TODA
YBAS
30
2029ft1005 hPa
29⁰C330/18
Bitumen0.3% up2550 lbs
8983ft2032ft (619m)
1. Calculate TODR – 172SP
LDR - C172SPThese tables can be found in the aircraft flight manual. We use these tables to work out landing distances for the C172SP
This data is only true when the aircraft is flown to the prescribed conditions
2. Calculate LDR – 172SP
LDR - C172SPFor this example we will use the same data that we used for the TODR tables
YBAS
30
2029ft1005 hPa
29⁰C330/18
H17/X09Bitumen0.3% up2550 lbs
8983ft1767ft
2. Calculate LDR – 172SP
LDR - C172SPWe start by filling out the W&B + Performance form
LDA is 7999ft
YBAS
30
2029ft1005 hPa
29⁰C2550 lbs
7999ft
2. Calculate LDR – 172SP
LDR - C172SPLanding Distance - Tables
We can now use the performance charts to determine our LDR
Our pressure height was 2029ft, temperature 29⁰C, so we must interpolate between 2000ft and 3000ft for 20⁰C and 30⁰C
1460ft – 1420ft = 40ft40ft / 1000 = 0.040.04 x 29 = 1ft1420ft + 1ft = 1420ft
1495ft – 1455 = 40ft40ft / 1000 = 0.040.04 x 29 = 1ft1455ft + 1ft = 1456ft
2. Calculate LDR – 172SP
LDR - C172SPLanding Distance - Tables
Our pressure temperature was 29 ⁰C so we must interpolate between 1456ft and 1420ft
1456ft – 1420 = 3636 / 10 = 3.63.6 x 9 = 32ft1420ft + 32ft = 1452ft
2. Calculate LDR – 172SP
LDR - C172SPLanding Distance - Tables
Our headwind wind component was 17KTS so we must decrease our LDR
17 / 9 = 1.9Therefore we can decrease our LDR by 19%1452ft x 0.81 = 1176ft
2. Calculate LDR – 172SP
NOTE: When calculating landing distance prior to departure we assume nil wind.
LDR - C172SPLanding Distance - Tables
This chart does not factor in CAO 20.7.4 so we must increase this value by 15%
1176ft x 1.15 = 1352ft (412m)
2. Calculate LDR – 172SP
LDR - C172SPLanding Distance - Tables
We then enter the LDR into the W&B + Performance form and compare it to our LDA
YBAS
30
2029ft1005 hPa
29⁰C2550 lbs
7999ft1352ft
2. Calculate LDR – 172SP
2. PracticeC172SP
Calculate TODR and LDR given the following information:
Aerodrome: YPPF
ATIS: YPPF C 180245 RWY: 03LWIND: 020/20VIS: WX: CAVOK + CLD: TMP: 15 QNH: 1013
Weight: 1157 Kg (2550 lbs)
C172SPCalculate TODR and LDR given the following information:
Aerodrome: YPPF
ATIS: YPPF E 200015 RWY: 21LWIND: 150/15VIS: WX: CAVOK + CLD: TMP: 30 QNH: 998
Weight: 1157 Kg (2550 lbs)
2. Practice
Questions?
