1. Ques: What happens if you're outstation and the deffered defects in ADDL is expiring and aircraft is to be dispatched soon?
Ans: If it is under CAT B or C, you must raise a RIE (Repair Interval Extension) form but you ONLY raise it once you're back in Singapore. As an LAE outstation, you are required to call your DE/SFM for their approval. Once approved, the DE/SFM will give you a serialised number to be entered in the ADDL under the "#MEL REPAIR INTERVAL EXTENSION FORM CONTROL NUMBER" and you can dispatch the aircraft. As for defects under CAT A or D in similiar situations, you'll have to ground the aircraft.
2. Ques: Why is it that during pressurisation test on ground, the differential pressure is only 4psig whereas in flight it is around 8.9psig?
Ans: This is because on ground the ambient pressure is higher whereas in flight the pressure is lesser. This is why the pressure difference between ambient and cabin in flight is greater. Cabin pressure is always maintained around 18.7psig.
Fahmi
3 comments:
sea level is 14.7 psi, why at 8000ft it is 18.9 psi? higher altitude exert lesser pressure right?
what i feel y is 4psid is because we cant take too high pressure(14.7+4=18.7).it is for our comfort. in air the psi is lower, so we can have higher differential pressure but cant over 8.9 due to the structural.
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