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Sequence of Decision for Airworthiness
2010-03-18

Sequence of Decision for Airworthiness Is it required by FAR 91.2095 or 91.213(d)(2)(ii)
If not Is it required by VFR-day type certificate requirements
If not Is it required by Airworthiness Directive?
If not Is it required by FARs 91.107, 91.171, 91.185, 91.205, 91.207, 91.209 or FAR 91.213(d)(2)(ii)
If not The inoperative must be removed or deactivated by a qualified mechanic and placarded as "inoperative". All work done must be logged and if removed the weight and balance must be calculated and corrected. FAR 43.9

Depending on flight conditions certain basic instruments are required. The groups are flight, engine, navigation and communication. If any required instruments are missing it is up to the pilot to determine the legality of flight. In general, if the aircraft received its airworthiness certificate with a device installed and operational, then it is required for every flight.
FAR 91.213 (a) Vs (d) says that you may (or may not) takeoff in an aircraft depending on how it meets four equipment requirements.
Non-turbine and without a master Minimum Equipment List. (MEL)
Item not required by FAR, MEL, or AD
Item removed or deactivated, placarded, maintenance log entries made, dated and signed by qualified and certified technician. The technician must determine that (3) above is not a hazard.
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