FAR 91.213 – Inoperative Instruments and Equipment
This regulation clearly states what the PIC must do to ensure airworthiness with inoperative equipment. Much of the regulation talks about a Minimum Equipment List (MEL) but that is a topic for another article. We are concerned with paragraph (d)(2) which lists four documents that must be checked to determine airworthiness.
1. Type Certificate
2. Aircraft Equipment List
3. FARs (91.205)
4. Airworthiness Directives (ADs)
Let’s look at each of these documents individually:
Every airplane (non-experimental) is certified with a type certificate which describes the approved components, limitations and certification basis referencing specific regulations. This document will describe the C172 is designed to fly with a Lycoming IO-360 engine, has a wing, rudder, elevator, etc. If something is broken and you need to look at this document then you probably need to speak with a mechanic for additional guidance.