Prop Safety: Treat Spinning Blades With Respect

It is not just sharp propeller edges that can hurt you when the engine is off.

Tuesday, November 01, 2022 at 08:59 AM ET

Verified

Although you shouldn't be afraid of the propeller, you should understand what it is capable of doing—and never ever become complacent. [Courtesy: Hartzell Propeller]

Key Takeaways:

Propellers pose significant hazards even when the engine is off, due to sharp edges and the potential for unexpected rotation if magnetos are engaged; always treat them with respect and use safe inspection techniques like backward rotation for repositioning.
Hand propping an aircraft requires strict adherence to a two-person, properly trained procedure, as unauthorized or solo attempts are extremely dangerous and can lead to severe accidents.
A turning propeller is the greatest risk, necessitating engine shutdown for passenger loading/unloading; if "hot loading" is unavoidable, passengers must be strictly escorted and approach/depart only from the aircraft's rear.
Promoting unsafe behavior, such as posing with hands on or within the propeller arc, is strongly discouraged as it conveys a dangerous and complacent attitude towards aviation safety.

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The learner stood in front of the airplane, checklist in hand as he performed the preflight inspection.

He double checked that the magnetos were off before moving to the front of the aircraft. The propeller of the Cessna 172 was in the horizontal position so he did not have a clear view of the engine compartment, nor could he see the alternator belt in order to inspect it. He was reluctant to get too close to the propeller as he had been reading about propeller safety—but how was he to finish the inspection without getting close to the prop? This led to a discussion about how to treat a propeller—I submit it should be treated like a big dog that you do not know—it could do something unexpected that could hurt you, so give it the respect it deserves.