The Rules of the Air: Navigating GACAR Part 91

Pre-flight Briefing

Welcome back. If Part 61 is about who is allowed to fly, GACAR Part 91 is about how we actually operate an aircraft safely. It is the core set of "traffic laws" for the skies over Saudi Arabia. Whether you're flying a Piper Seneca for a weekend getaway or operating a corporate Gulfstream, Part 91 applies to you.

Core Concepts of Part 91

1. Pilot-In-Command (PIC) Responsibility Part 91 makes one thing absolutely clear: The PIC is the final authority as to the operation of the aircraft. In an emergency, the PIC can deviate from any rule in Part 91 to the extent required to meet that emergency. With great power comes immense responsibility—you must be familiar with all available information concerning that flight before departure.

2. Visual Flight Rules (VFR) vs. Instrument Flight Rules (IFR) Part 91 distinctly separates weather minimums and operational rules depending on your flight rules. It dictates the minimum visibility and distance from clouds to maintain VFR in different classes of airspace, and outlines the strict operational adherence to ATC clearances under IFR.

3. Aircraft Airworthiness You can't fly a broken plane. Part 91 dictates that the PIC is responsible for determining whether the aircraft is in condition for safe flight. While major maintenance is covered in Parts 43 and 145, the pre-flight inspection and go/no-go decision rests entirely on your shoulders under Part 91.

Why Part 91 Matters Even for Airlines

You might wonder, "Don't airlines operate under Part 121?" They do! However, Part 121 (Air Carriers) adds stricter layers on top of Part 91. Part 91 is the foundational layer. Every single flight must satisfy Part 91.

The Captain’s Advice

Part 91 is your daily companion. Never let complacency allow you to forget the basics of airspace clearance, fuel reserves, and right-of-way rules. Memorizing Part 91 doesn't just keep you legal; it keeps you alive.