PC-12
Flight Crew Commercial
Flight Crew Last 90 Days 30; Flight Crew Total 1300; Flight Crew Type 50
Communication Breakdown
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural MEL / CDL; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Logbook Entry; MEL; Manuals
Aircraft was MELed for an AHRS connectivity issue on DATE and was legally deferred. It states there 'may be inoperative'. However; upon looking closer 1 AHRS is required for dispatch; meaning the MEL on DATE should of been a grounding issue. This was caught on DATE around XA:49 local. It was flown on DATE for four flights. Arrival airports were all VFR. Ultimately; confusion with the MEL layout played a factor as well as not being caught by maintenance when deferred via a phone call with them and some paperwork.
PC-12 Captain reported improper MEL caused four flights of an aircraft with AHRS connectivity issues to fly in a non airworthy condition.