AFM 4-2
Replacing a Propeller
If the propeller is broken, cracked, or chipped, it must be replaced. If you are unsure of the condition
of a propeller, perform a quick throttle check. A damaged propeller can cause harmful vibrations to
the airframe and will make a buffeting sound during the full throttle check.
It is possible that one propeller blade will break, and the other will remain intact. Replace only the
broken side. Make certain that the two propeller blades are identical. Raised lettering near the center
of the propeller indicates the diameter and pitch (i.e. 15 x 10).
To replace a propeller blade, use the crescent wrench and flathead screwdriver to remove the nut
and screw attached to the propeller yoke. Place the new propeller blade root into the yoke, ensuring
that the printed lettering on the propeller is facing forward. Insert the screw and thread the lock nut
into place and re-tighten. Tighten until the propeller has enough friction to remain in place when
extended.
Remove a propeller using the crescent wrench and flathead screwdriver.
Replacing a Broken Wing Bolt
It is possible for one or more wing bolts to break upon landing. This is normal and prevents damage
to the fuselage and wings. To replace a broken bolt, attempt to use pliers to twist off the broken
shaft. If the bolt is completely recessed, insert the tip of an X-Acto blade into the plastic bolt and twist
counter-clockwise to remove. It may be necessary to tap the backside of the knife to bury it deeper
into the bolt.
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