A320 Engine Start Query
Thread Starter
Joined: May 2009
Posts: 5
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From: New Delhi,India
A320 Engine Start Query
Hi everyone!
I have a question for all A320 mechs out there.Consider the following scenario:
1)Aircraft on ground with both engines shut down.
2)APU unserviceable although HP ground air cart is available.
3)No ground power supply available.
In such a case, is it possible to start engines on batteries alone? Are there any maintenance manual/FCOM procedure references for this?
Thnkx in advance!!
I have a question for all A320 mechs out there.Consider the following scenario:
1)Aircraft on ground with both engines shut down.
2)APU unserviceable although HP ground air cart is available.
3)No ground power supply available.
In such a case, is it possible to start engines on batteries alone? Are there any maintenance manual/FCOM procedure references for this?
Thnkx in advance!!
Joined: Apr 2004
Posts: 775
Likes: 2
From: near EDDF
Originally Posted by maninder.jessel
...In such a case, is it possible to start engines on batteries alone? ...
Originally Posted by maninder.jessel
...Are there any maintenance manual/FCOM procedure references for this?...
Joined: Jul 2007
Posts: 83
Likes: 0
From: UK
I have no evidence of this but I am led to believe by a bus driver that this is possible. You must select both fadecs on manually which will use batt power until dedicated genny comes on at around 7% n2. Varies between eng type of course.
Joined: Feb 2009
Posts: 30
Likes: 0
From: Singapore
Theoretically it is possible to start the engine under the stated conditions ,if you press the EMER GEN TEST switch . When you press the EMER GEN TEST switch you are able to power 28V DC EssBus(4PP) by batery2 ,and battery1 powers static inverter and static inverter 115V AC powers AC ESS Bus (4XP) and static inverter bus 901XP..
If these buses are powered you can get power for IGN A, Captain PFD/ND and Upper center display unit E/WD , other LRUs related to engine start are also powered.
Make sure your batteries are in good condition. EMER GEN TEST switch is momentary contact switch,you should keep it pressed till your start is complete and you power the aircraft with engine power(IDG).
This is not an approved procedure and you should follow the approved AMM and FCOM procedures to start the engine.
Never experiment with aircraft systems,follow approved safe procedures and practices.
If this was asked in a oral interview to test the knowledge of the candidate, the above explanation is theoretical answer.
If these buses are powered you can get power for IGN A, Captain PFD/ND and Upper center display unit E/WD , other LRUs related to engine start are also powered.
Make sure your batteries are in good condition. EMER GEN TEST switch is momentary contact switch,you should keep it pressed till your start is complete and you power the aircraft with engine power(IDG).
This is not an approved procedure and you should follow the approved AMM and FCOM procedures to start the engine.
Never experiment with aircraft systems,follow approved safe procedures and practices.
If this was asked in a oral interview to test the knowledge of the candidate, the above explanation is theoretical answer.
