Maintenance Release Under Commercial Pressure
An H125 operated by a small charter company has an MEL item open: the standby attitude indicator is unserviceable. The MEL permits dispatch for 10 days provided a specified operational procedure is followed and the aircraft remains within certain conditions. It is day 9. The aircraft is scheduled for a 06:00 departure carrying a survey team into mountainous terrain, which the MEL conditions exclude. The operator's account manager asks you to 'sign it out anyway, it's only one day over and the weather is fine'. Separately, you notice the aircraft's maintenance release document was completed by the previous shift but the CRS (certificate of release to service) box is unsigned. The previous engineer has gone home. The aircraft is otherwise serviceable.
1. Can you release the aircraft for the survey flight with the standby attitude indicator unserviceable?
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No. The MEL is a permission with conditions, and one of those conditions excludes the intended operation (mountainous terrain). Day 9 versus day 10 is irrelevant because the limiting factor is the operational condition, not the calendar. Dispatching outside the MEL conditions is a violation of the approved MEL and of CAR 84. The correct action is to have the item rectified before the flight, or to decline the dispatch. The account manager's assurance about weather does not change the MEL.
2. What is the status of the unsigned CRS, and what may you do about it?
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An unsigned CRS means the aircraft has not been validly released to service for that maintenance. You cannot simply sign in the previous engineer's name - that would be a false certification. You may only issue a CRS if you have personally satisfied yourself that the maintenance was performed correctly, which means reviewing the work pack, inspecting the work, and confirming approved data and parts. If you can do that, you sign in your own name and take responsibility. If you cannot verify the work, the aircraft is not released until the previous engineer or another authorised person completes the certification properly.
3. How do the MEL issue and the CRS issue interact, and what is your overall decision?
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They are independent grounds for refusing release, and either alone would prevent the flight. The MEL condition is not met for the intended route, and the CRS is invalid. The overall decision is: no release for the 06:00 survey flight. Rectify the standby attitude indicator or replace it, and resolve the CRS by proper verification and signature. Document both refusals, notify the operator in writing, and escalate the unsigned-CRS practice - it suggests a shift-handover weakness that could recur. Commercial pressure is not a factor in the decision.