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during engine start or shutdown, if the aircraft is moving ?
On A320 family,electrical transients
during engine start/shutdown
– Automatic switch of BSCU channel
Alternate braking temporarily takes over
Greater braking efficiency in ALTN for same pedal deflection
Possible jerk if the aircraft is moving
© AIRBUS 2005 S.A.S. All rights reserved. Confidential and proprietary document.
One/two engine taxi 24 14th Performance & Operations Conference Bangkok, 4-8 April 2005
F.A.Q.
 On Single Aisle,why does Airbus recommend to not brake
during engine start or shutdown, if the aircraft is moving ?
(cont’d)
Braking is allowed during engine start/shutdown
 FCOM wording clarified at next revision (sept 05) :
“during engine start or shutdown,a slight jerk forward may occur
if brakes are applied when the aircraft is moving”
© AIRBUS 2005 S.A.S. All rights reserved. Confidential and proprietary document.
One/two engine taxi 25 14th Performance & Operations Conference Bangkok, 4-8 April 2005
Contents
 Introduction
 Why should I perform an “engine out” taxi ?
 Conditions to perform an “engine out” taxi
 F.A.Q. :
Do I need APU ?
Can I perform an “engine out” taxi in icing conditions ?
Can I brake during engine start/shutdown on S.A. ?
Can I perform the flight control check ?
 Conclusion
© AIRBUS 2005 S.A.S. All rights reserved. Confidential and proprietary document.
One/two engine taxi 26 14th Performance & Operations Conference Bangkok, 4-8 April 2005
F.A.Q.
 Can I perform the flight control check during an “engine out”
taxi ( All FBW) ?
 On a system point of view,no objection
Ground tests found fully acceptable
 But, recent isolated in-service event led to necessity of flight
control check in takeoff configuration , in terms of electrical
and hydraulic power.
Therefore with all engines started.
As all the failures cannot be automatically monitored
© AIRBUS 2005 S.A.S. All rights reserved. Confidential and proprietary document.
One/two engine taxi 27 14th Performance & Operations Conference Bangkok, 4-8 April 2005
F.A.Q.
 Can I perform the flight control check during an “engine out”
taxi ( All FBW) (cont’d) ?
 New procedure to be incorporated to all FBW for commonality
purposes :
 Can be performed during engine warm up period.
The flight control check has to be performed
after all engine starts, followed by the autobrake
max selection.
© AIRBUS 2005 S.A.S. All rights reserved. Confidential and proprietary document.
　
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