Use of extension periods
Thread Starter
Use of extension periods
I'm interested to know what the standard practices are for the use of the 10% tolerance in relation to maintenance checks hours is. e.g a 500 hour check having a 50 hour extension available in the AMP/AMM. Do you treat this buffer as yours to use as a rightm, or do you have to gain an approval through a formal QA/QC sign off process? Thanks!
Permitted Variations
In my organisation in the UK, conditions and permitted periods that can be applied using a variation to a maintenance task are laid down in the AMP.
Maintenance Planning apply for a variation for consideration by Quality, if it meets the AMP criteria, unforeseen circumstances, non-mandatory, not ultimate life etc. it is approved.
Once granted, all variations are notified to the national authority.
Maintenance Planning apply for a variation for consideration by Quality, if it meets the AMP criteria, unforeseen circumstances, non-mandatory, not ultimate life etc. it is approved.
Once granted, all variations are notified to the national authority.
On my side of the pond, if operating under a Part 135 (Air Taxi) certificate the use of extensions will/should be spelled out in the submitted ops specs or 135 maintenance manual. For example, in the EC135 AMM it offers a plus/minus variance in numerous inspections that do not penalize the operator if complied with X hrs before or X hrs after the standard schedule of say 400hrs. However, in order to use that program it must be indicated in the ops specs/manual of record. It is normally not a field function to use it or not unless your a private operator which is another entirely different scenario.
On a side note, some generic extensions found in AD's or in a regulatory format are usually for "scheduling" said aircraft remaining flight time to get to a facility to comply with said maintenance--but not to be used for revenue flights. But this example is a big gray area.
W1
On a side note, some generic extensions found in AD's or in a regulatory format are usually for "scheduling" said aircraft remaining flight time to get to a facility to comply with said maintenance--but not to be used for revenue flights. But this example is a big gray area.
W1
Join Date: Nov 2014
Location: New Zealand
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NZ allows extension unless specifically prohibited. (ADs, ELT, S mode, 24month avionic checks etc.)
My old Part 43 boss ran his whole life on the 10%, pretty pointless with the reforecast date.
My old Part 43 boss ran his whole life on the 10%, pretty pointless with the reforecast date.
