Key numbers

032 PerformanceChapter 7

Aircraft classes

Class	Criteria
A	All jets; or turboprop with MOPSC >9 or MTOW >5700 kg
B	Prop, MOPSC ≤9, MTOW ≤5700 kg
C	Prop, MOPSC >9 or MTOW >5700 kg

Screen heights

Condition	Height
Class B / Class A normal	50 ft
Class A dry T/O	35 ft
Class A wet T/O	15 ft

Clearway & TODA

Item	Value
Clearway max	50% TORA
Clearway min width	75 m each side
Clearway max slope	1.25%
TODA (typical max)	150% TORA

V-speed minimums

Speed	Value
VY (jets)	1.32 VMD
VR (Class A)	≥ 1.05 VMCA, ≥ V1
V2 (turbojet)	≥ 1.13 VSR
V2 (turboprop)	≥ 1.08 VSR
V2 / VMCA	≥ 1.10 VMCA
VREF Class B	≥ 1.3 VSO
VREF Class A	≥ 1.23 VSR0
VMCA	≤ 1.2 VS1
Class B T/O safety (MEP)	1.1 × VMC
Class B T/O safety (SEP)	1.2 × VS1

Service ceilings

Type	Service ceiling ROC
Piston/prop	100 fpm
Jet	500 fpm
Performance (AEO)	300 fpm
Absolute	0 fpm

Class B factors

Factor	Multiplier
No stopway/clearway TORR	TODR × 1.25
With stopway/clearway TORR	× 1.0
With stopway/clearway ASDR	× 1.3
With stopway/clearway TODR	× 1.15
Landing LDR (regulatory)	× 1.43
Dry grass T/O	× 1.2
Wet grass T/O	× 1.3
1% upslope T/O	× 1.05
1% downslope landing	× 1.05

Class A landing

Item	Factor
Turbojet LDR	× 1.67 (60% runway)
Turboprop LDR	× 1.43 (70% runway)
Wet runway	× 1.15
Landing climb CG	3.2% min
Discontinued approach (2 eng)	2.1% min

OEI segments (2 engines)

Segment	Min CG
2nd (≥400 ft)	2.4%
3rd / 4th	1.2%

Climb & planning

Item	Value
Class B en-route ROC	300 fpm
Net gradient adjustment	Gross + 0.5%
AEO factor (VMC planning)	× 0.77
Wind factoring T/O	50% HW, 150% TW
VEF to V1 delay	2 s
Brake cooling wait	53 min
ETOPS (non-approved)	60 min OEI
Drift-down obstacle (Class A)	2000 ft
Contamination threshold	>0.3 mm, >25% area
Max crosswind contaminated	10 kt
PCN/ACN exceedance	10%

Speed relationships

Item	Note
Long range cruise	4% above max range
LRC mnemonic	Eat Chicken Tikka Masala
Climb angle °	Gradient % × 3/5
VSR vs VS	VSR ≈ 6% above VS