AD-47-21-10
Propeller
Guide Pins
Category:
navion,
propeller, hartzell
Applicability: Serial
numbers NAV-4-2 Through NAV-4-1010 with Hartzell HC-12X20-1
Propellers.
Supersedes: Was
mandatory note 9 of AD-782-3
Compliance:
Accomplish not later than September 1, 1947
Procedure:
The propeller control piston guide pins, Hartzell P/N A-11,
require additional safetying in order to prevent loosening and
subsequent loss of engine oil. This is accomplished by the
installation of a 3/32-inch steel dowel through the guide pin.
NAA Field Service Bulletin No. 30 covers this rework.
AD-47-21-10