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Composition and Effect
All Engine Acceleration Capability
- 130 Knots
6 mm of slush -- 10-20 % reduction in all engine acceleration
13 mm of slush -- 20-40 % reduction in all engine acceleration
All engine
acceleration
Kt/sec
Dry
6 mm
13 mm
747 767 757 737
Dry
6 mm
13 mm
Dry
6 mm
13 mm
Dry
6 mm
13 mm
4.0
3.0
2.0
1.0
0.0
A project supported by AIRBUS and the CAAC
Date of the module
Composition and Effect
Engine Out Acceleration Capability
-- 130 Knots
6 mm of slush -- 15-50 % reduction in engine out acceleration
13 mm of slush -- 30-110 % reduction in engine out acceleration
747
0.0
1.0
2.0
3.0
4.0
6 mm
1/4"
1/4"
1/2"
13 mm
1/2"
Dry all
engine
-0.5
OEI
DRY
767 757 737
6 mm
13 mm
OEI
DRY
6 mm
13 mm
OEI
DRY
6 mm
13 mm
OEI
DRY
Dry all
engine
acceleration
Kt/sec
Dry all
engine Dry all
engine
A project supported by AIRBUS and the CAAC
Date of the module
Composition and Effect
One Engine Inoperative Deceleration Capability 1
30 Knots
Deceleration
Kt/sec
Dry
6 mm
1/2"
13 mm
Dry
6 mm
13 mm
Dry
6 mm
13 mm
Dry
6 mm
13 mm
8.0
6.0
4.0
2.0
0.0
747 767 757 737
 Dry - AFM performance - includes maximum braking, spoilers,
idle thrust
 Slush - includes wheel braking, spoilers, reverse thrust,
and slush drag
A project supported by AIRBUS and the CAAC
Date of the module
1 - Take-off speeds
2 - Take-off distances and lengths available
3 - Take-off flight path
4 - Take-off data influence
5 - Maximum allowed take-off weight calculation
6 - Wet and contaminated runway
7 - Flexible take-off and Derated take-off
Table of Contents
A project supported by AIRBUS and the CAAC
Date of the module
:
Reduction of
Probability of
failure
Maintenance
Costs
Operating
Costs
A project supported by AIRBUS and the CAAC
Date of the module
Flexible temperature:
The temperature at which
the maximum take off thrust
would allow to take off at no
more than the actual TOW.
Flexible take-off : Principle
Actual
temp
Flexible
temp
m
temperature
RTOW
2nd sgt
MTOW
Runway
actual
TOW
A project supported by AIRBUS and the CAAC
Date of the module
 Instead of setting the
 take-off thrust corresponding
to the actual temp,
 the thrust is reduced to a value
equal to the take off thrust
corresponding to the flexible
temp
Actual
temp
Flexible
temp
m
Thrust  75% take off
thrust (actual t°c)
temperature
RTOW
2nd sgt
MTOW
Runway
actual
TOW
Flexible take-off: Principle
A project supported by AIRBUS and the CAAC
Date of the module
Thrust reductioncannot exceed 25%
Tflex > Tref;Tflex > OAT;Tflex  Tflex.max
Take-off is forbidden on a contaminated runway
The thrust of takeoff is not considered as a takeoff operating limit
A project supported by AIRBUS and the CAAC
Date of the module
Flexible take off: Operating conditions
 is not authorized:
 on contaminated runway
 on wet runway (unless you could take in account the
increasing of stop distance).
 where items affecting performance involves
significant increase in crew workload (Ex: inoperative
equipment, reversers..).
A project supported by AIRBUS and the CAAC
Date of the module
engine
engine engine
engine
engine
Certified Certified Certified Certified Certified
Reduced takeoff thrust
A project supported by AIRBUS and the CAAC
Date of the module
For the A340-500/600, two
new derate levels have been
added: 32% and 40%
A project supported by AIRBUS and the CAAC
Date of the module
 Which one shall be favored?
1. Derated thrust;
2. Flexible thrust.
A project supported by AIRBUS and the CAAC
Date of the module
 Flexible takeoff
1. Standard way to reduce
takeoff thrust
2. Only one takeoff chart
3. Posibility to go TOGA
　
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