1. C172 Performance

2. Aim
To determine take-off and landing distances using flight manual data for the Cessna 172SP

3. Objectives Calculate Take Off Distance Required for C172SP
Calculate Landing Distance Required for C172SP
Practice problems
State TEM, Airmanship, and Human Factors considerations

4. 1. Calculate TODR – 172SP TODR - 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

5. 1. Calculate TODR – 172SP TODR - C172SP
Calculate TODR given the following information:
Aerodrome: YBAS
ATIS: YBAS H
RWY: 30
WIND: 330/18
VIS:
WX: CAVOK +
CLD:
TMP: 29
QNH: 1005
Weight: 1157 Kg (2550 lbs)

6. 1. Calculate TODR – 172SP TODR - C172SP
We can start by gathering the relevant information from the ERSA
Elevation: 1789ft

7. 1. Calculate TODR – 172SP TODR - C172SP
We can start by gathering the relevant information from the ERSA
Elevation: 1789ft
TODA: 8983ft (2738m)
Slope: 0.3% up

8. 1. Calculate TODR – 172SP TODR - C172SP
Fill out the W&B + Performance form with the known data
YBAS 30
To determine pressure height:
Determine pressure variation from ISA
1013 hPa – 1005 hPa = +8hPa
Multiply variation by the pressure lapse rate, 30ft per 1 hPa
+8 hPa x 30ft = +240ft
Apply the variation to the aerodrome altitude
Since QNH is less than ISA, pressure altitude will be higher
1789ft + 240ft = 2029ft
1005 hPa
2029ft
29⁰C
330/18
Bitumen
0.3% up
2550 lbs
8983ft

9. 1. Calculate TODR – 172SP TODR - C172SP Determine Wind Components:
YBAS
Headwind
Component
= 17kts 30
1005 hPa
2029ft
29⁰C
330/18
H17/X09
Crosswind
Component
= 9kts
Bitumen
0.3% up
2550 lbs
8983ft

10. 1. Calculate TODR – 172SP TODR - C172SP Take-off Distance - Tables
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 = 205ft
205ft / 1000 = 0.205
0.205 x 29 = 6ft
2035ft + 6ft = 2041ft
2420ft – 2190ft = 230ft
230ft / 1000 = 0.23
0.23 x 29 = 7ft
2190ft + 7ft = 2197ft

11. 1. Calculate TODR – 172SP TODR - C172SP Take-off Distance - Tables
Our pressure temperature was 29⁰C so we must interpolate between 2197ft and 2041ft
2197ft – 2041ft = 156
156ft / 10 = 15.6
15.6 x 9 = 140ft
2041ft + 140ft = 2181ft

12. 1. Calculate TODR – 172SP TODR - C172SP Take-off Distance - Tables
Our headwind wind component was 17KTS so we must decrease our TODR
17 / 9 = 1.9
Therefore we can decrease our TODR by 19%
2181ft x 0.81 = 1767ft

13. 1. Calculate TODR – 172SP TODR - C172SP
This chart does not factor in CAO 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
1005 hPa
2029ft
29⁰C
330/18
Bitumen
0.3% up
2550 lbs
2032ft (619m)
8983ft

14. 2. Calculate LDR – 172SP LDR - C172SP
These 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

15. 2. Calculate LDR – 172SP LDR - C172SP YBAS
For this example we will use the same data that we used for the TODR tables 30
1005 hPa
2029ft
29⁰C
330/18
H17/X09
Bitumen
0.3% up
2550 lbs
1767ft
8983ft

16. 2. Calculate LDR – 172SP LDR - C172SP YBAS
We start by filling out the W&B + Performance form
LDA is 7999ft 30
1005 hPa
2029ft
29⁰C
2550 lbs
7999ft

17. 2. Calculate LDR – 172SP LDR - C172SP Landing 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 = 40ft
40ft / 1000 = 0.04
0.04 x 29 = 1ft
1420ft + 1ft = 1420ft
1495ft – 1455 = 40ft
40ft / 1000 = 0.04
0.04 x 29 = 1ft
1455ft + 1ft = 1456ft

18. 2. Calculate LDR – 172SP LDR - C172SP Landing Distance - Tables
Our pressure temperature was 29 ⁰C so we must interpolate between 1456ft and 1420ft
1456ft – 1420 = 36
36 / 10 = 3.6
3.6 x 9 = 32ft
1420ft + 32ft = 1452ft

19. 2. Calculate LDR – 172SP LDR - C172SP Landing Distance - Tables
Our headwind wind component was 17KTS so we must decrease our LDR
17 / 9 = 1.9
Therefore we can decrease our LDR by 19%
1452ft x 0.81 = 1176ft
NOTE: When calculating landing distance prior to departure we assume nil wind.

20. 2. Calculate LDR – 172SP LDR - C172SP Landing Distance - Tables
This chart does not factor in CAO so we must increase this value by 15%
1176ft x 1.15 = 1352ft (412m)

21. 2. Calculate LDR – 172SP LDR - C172SP Landing Distance - Tables YBAS
We then enter the LDR into the W&B + Performance form and compare it to our LDA 30
1005 hPa
2029ft
29⁰C
2550 lbs
1352ft
7999ft

22. 2. Practice
C172SP
Calculate TODR and LDR given the following information:
Aerodrome: YPPF
ATIS: YPPF C
RWY: 03L
WIND: 020/20
VIS:
WX: CAVOK +
CLD:
TMP: 15
QNH: 1013
Weight: 1157 Kg (2550 lbs)

23. 2. Practice
C172SP
Calculate TODR and LDR given the following information:
Aerodrome: YPPF
ATIS: YPPF E
RWY: 21L
WIND: 150/15
VIS:
WX: CAVOK +
CLD:
TMP: 30
QNH: 998
Weight: 1157 Kg (2550 lbs)

24. Questions?