When installing propellers, what must be matched and secured correctly?

• A.Any propeller can go on any motor because they are interchangeable in all cases
• B.Each propeller's designated position and direction of rotation, secured as specified by the manufacturer
• C.Propellers should be left finger-loose so they self-tighten in flight

Why

Many designs use different propellers for clockwise and counterclockwise motors. Installing a propeller in the wrong position or failing to secure it can produce loss of thrust or ejection in flight.

Source: FAA-G-8082-22 Ch. 12 · ACS knowledge area: Maintenance and Preflight Inspection Procedures · From the Maintenance & Preflight Inspection practice bank (MNT-033).

Practice this category as a full test

More Propeller Installation questions

• During a preflight inspection you find a small nick and a hairline crack near the hub of one propeller. What is the correct action?
• What should a careful inspection of the airframe and arms look for before flight?
• When you rotate a motor by hand during preflight, it feels gritty and makes a scraping sound unlike the other motors. What should you do?
• Under 14 CFR 107.15, when may a remote pilot in command operate a small unmanned aircraft that he or she knows is not in a condition for safe operation?
• How does required maintenance for a small unmanned aircraft differ from that for most manned aircraft?