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IRS Alignment

Old 24th Aug 2020, 11:09
  #1 (permalink)  
Thread Starter
 
Join Date: Feb 2019
Location: Azerbaian, Baku
Age: 33
Posts: 5
IRS Alignment

Hello guys, I hope your duties are going well.
I have doubt about IRS ALIGNMENT PROCEDURES on A320 a/c. It was the second time I was told that " Bahruz, try don't ALIGN IRS during REFUELLING procedure! ''.
Actually, I was not able to find it anywhere ( I mean, neither in FCOM nor in AFM), why that is prohibited or not recommended to do?
He explained to me that, '' when the refuelling is going on, an a/c getting shake off and your IRS unable to understand and as if it should make a '' false alignment' ''.
Have you ever had like this matter?
Thanks all in advance!
Bahruz is offline  
Old 26th Aug 2020, 00:20
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Join Date: Jul 2005
Location: At the OMT
Posts: 145
The idea is feasible but probably under certain conditions such as cold weather, high oleo pressure, starting refuel from very light load causing a heavy drop, but can't say the aircraft settling during refueling has ever caused me a problem when aligning the ADIRUs. I think you'd have a problem specifically saying it was the refueling causing a problem when pax and freight loading could also be going on also. Sudden settling is more noticeable on the A330/340, and they have never caused me a problem either. If the ADIRUs do not like the excess movement, you get an ECAM message and just do a re-align, so does not cause much of a problem anyway, which I have seen if towing the aircraft during an alignment which could be an excess airframe movement or change of GPS location if using GPS align.

Generally, most of the time I'll have the ADIRUs on for refuel (pitch and roll inputs to FCMCs required), and it is the crew who do the alignment and I've never seen a crew hold off until refuel is complete either.

Having said all that, I'd also need to check the AMM ADIRU alignment procedure for any warnings and cautions which would override my experience.
Tom Sawyer is offline  
Old 26th Aug 2020, 17:41
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Join Date: Feb 2019
Location: Azerbaian, Baku
Age: 33
Posts: 5
I read your answer, Thanks, man!
Bahruz is offline  

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