A320 / A321 Noise on Push Back
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A320 / A321 Noise on Push Back
Just wondered if anyone can tell me what the wierd noise is that can be heard from under the floor of an A320 / A321 on push back. The best way of describing it is the loud noise of a car cranking on a flat battery! Same noise also heard after parking on stand. Is it parking brake? Its something unique to Airbus and not heard on a Boeing.
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Out of interest which system(S) power the brakes on the scarebus?
Also does the activation of the PTU cause distracting messages on the ECAM or are they inhibited during start?
Also does the activation of the PTU cause distracting messages on the ECAM or are they inhibited during start?
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Nothing untoward on ECAM.
HYD PTU shows on bottom right hand side of EWD during its self test on engine start. Would also be indicated on HYD page on SD if you were to select it.
Must be at least a week since this question was asked last
HYD PTU shows on bottom right hand side of EWD during its self test on engine start. Would also be indicated on HYD page on SD if you were to select it.
Must be at least a week since this question was asked last
Warning Toxic!
Disgusted of Tunbridge
Disgusted of Tunbridge
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Well I think it sounds like an Alsation in the hold barking. I was wondering once whether to insist before pushback they dealt with the poor dog in distress in the rear hold! Could have been so embarrassing.
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Thanks JEANS42TRF.
To the others who ridicule those of us less well informed - I never knew asking a simple techncial question out of curiosity having just been on 4 airbuses in 3 days would cause so much distress and inconvenience to you all. Apologies.
To the others who ridicule those of us less well informed - I never knew asking a simple techncial question out of curiosity having just been on 4 airbuses in 3 days would cause so much distress and inconvenience to you all. Apologies.
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Here to be corrected, but I think that the Ptu is inhibited during first engine start (so it will not be working) and during 2nd engine start is TESTED (that's when you hear it). So the ptu during the 1st engine start will not Sense any dp since it's inhibited.
[PTU pb sw
AUTO : The bidirectional power transfer unit is armed and both the yellow and the green electrohydraulic valves are open.
The power transfer unit runs automatically when the differential pressure between the green and yellow systems is more than 500 PSI.
Note : The PTU is inhibited during the first engine start and automatically tested during the second engine start. ] from the FCOM but
I don't really get when it kicks in, during the 2nd engine start or between the 2 start???
If it's inhibited it will not work, but if it's tested will it? or it's just a self test?
Anybody?
Note: You would also hear it if you did single engine taxing and when on the gate forgot to switch off the yellow elec pump.
Speevy
[PTU pb sw
AUTO : The bidirectional power transfer unit is armed and both the yellow and the green electrohydraulic valves are open.
The power transfer unit runs automatically when the differential pressure between the green and yellow systems is more than 500 PSI.
Note : The PTU is inhibited during the first engine start and automatically tested during the second engine start. ] from the FCOM but
I don't really get when it kicks in, during the 2nd engine start or between the 2 start???
If it's inhibited it will not work, but if it's tested will it? or it's just a self test?
Anybody?
Note: You would also hear it if you did single engine taxing and when on the gate forgot to switch off the yellow elec pump.
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If I've said it once, I've said it 1000 times, we need a separate PPRune forum dedicated entirely to weird Airbus noises!
How about some weird Boeing noises?
Regards,
Old Smokey
How about some weird Boeing noises?
Regards,
Old Smokey
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A320/321 Noise On Push Back
TASK 32-20-00-810-801- 01
Grinding Noise from the NLG during Taxiing or Towing (Trouble Shooting procedure Weight on Wheels)
NOTE:
The noise is because there is not sufficient lubrication in the shock absorber.This condition does not have an effect on safety.If it is not possible to do the lubrication procedure immediately (because there is not sufficient time or equipment),do it at the first opportunity.
If you mean grinding noise during towing(with tow bar) and taxiing above note answers your question and the TSM Task is given for rectification.
Grinding Noise from the NLG during Taxiing or Towing (Trouble Shooting procedure Weight on Wheels)
NOTE:
The noise is because there is not sufficient lubrication in the shock absorber.This condition does not have an effect on safety.If it is not possible to do the lubrication procedure immediately (because there is not sufficient time or equipment),do it at the first opportunity.
If you mean grinding noise during towing(with tow bar) and taxiing above note answers your question and the TSM Task is given for rectification.