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35 ft
TAKE OFF SPEEDS (FAR-JAR §
25.107)
V1 V Speed
If I am aware of a failure after V1
I MUST follow on take off with OEI :
35 ft
from that point, I am
sure to reach 35ft
before the end of the
take-off distance available
A project supported by AIRBUS and the CAAC
Date of the module
 V1 : Take off decision speed chosen by the applicant:
BR V1 VR VLOF
V2
35 ft
TAKE OFF SPEEDS (FAR-JAR §
25.107)
V1 V Speed
If I am aware of a failure after V1
I MUST follow on take off with OEI :
I am too fast to brake
safely before the end
of the accelerate-stop
distance available
A project supported by AIRBUS and the CAAC
Date of the module
Summary : In Operations,
if the pilot is aware of a failure :
 V1 : Take off decision speed chosen by the applicant:
V1
stop continue
before V1 after V1
BR V1 VR VLOF
V2
35 ft
TAKE OFF SPEEDS (FAR-JAR §
25.107)
A project supported by AIRBUS and the CAAC
Date of the module
 V1 definition for flight tests
VEF : Engine Failure speed
During flight tests, the critical engine is made
inoperative at VEF
VEF  VMCG : the aircraft must remain under
control to follow on the take off
A project supported by AIRBUS and the CAAC
Date of the module
 V1 definition for flight tests
VEF : Engine Failure speed
During flight tests, the critical engine is made
inoperative at VEF
V1 = VEF+ speed gained during the time necessary to
recognize the failure and react to it
Actual VEF V1
engine failure
Failure recognized
Pilot ready to act
About 1 s.
A project supported by AIRBUS and the CAAC
Date of the module
 V1 : limits
VMCG VEF V1
VMBE
VR
VMBE : Maximum Brake Energy Speed
(maximum speed for full braking to a complete stop)
A project supported by AIRBUS and the CAAC
Date of the module
 V1 : Decision Speed
 VR : Rotation Speed : the pilot pulls the stick to set
the take off attitude
V1 VR VLOF
V2
35 ft
BR
TAKE OFF SPEEDS (FAR-JAR §
25.107)
A project supported by AIRBUS and the CAAC
Date of the module
 VR : limits
VR may not be less than
V1
1.05 VMCA
the speed that allows reaching V2 before reaching a
height of 35 ft
a speed that, if the aeroplane is rotated at its
maximum practicable rate, will result in a satisfying
VLOF
A project supported by AIRBUS and the CAAC
Date of the module
 V1 : Decision speed
 VR : Rotation speed
 VLOF : Lift off speed : at which the aircraft first
becomes airborne
V1 VR VLOF
V2
35 ft
BR
TAKE OFF SPEEDS (FAR-JAR §
25.107)
A project supported by AIRBUS and the CAAC
Date of the module
 VLOF : limits
when lift off is limited by the
geometry of the aeroplane, or by
elevator power, the margins may be
reduced to 1.08 and 1.04
may not be less than
1.10 VMU (AEO)
1.05 VMU (OEI)
may not be higher than
VTIRE
= maximum speed for tires resistance
A project supported by AIRBUS and the CAAC
Date of the module
 V1 : Decision Speed
 VR : Rotation Speed
 VLOF : Lift Off Speed
 V2 : Take off climb Speed : V2 must be reached at
least at 35 ft height
V1 VR VLOF
V2
35 ft
BR
TAKE OFF SPEEDS (FAR-JAR §
25.107)
A project supported by AIRBUS and the CAAC
Date of the module
 OEI Take off :
 V2 must be maintained
until reaching the
acceleration height
(400 ft minimum)
 AEO Take off :
 the climb speed is 10 to
15 kt higher than V2
 V2 :
must be reached at least at 35 ft above TO surface
A project supported by AIRBUS and the CAAC
Date of the module
 V2 : limit
is the greater of
1.2 VS or 1.13 VS1g
(before oct 2000)
1.1 VMCA
V2  V2min
A project supported by AIRBUS and the CAAC
Date of the module
SUMMARY
V1
VR
VLOF
V2
35 ft
VMCG VEF VMBE
1.05 VMCA
1.10 VMU(AEO)
1.05 VMU(OEI) VTIRE
1.2 VS
1.1 VMCA
V1 VR V2
on the take off card
TAKE OFF SPEEDS (FAR-JAR §
25.107)
A project supported by AIRBUS and the CAAC
Date of the module
1 - Take-off speeds
2 - Take-off distances and lengths available
　
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