AD-47-21-07
Carburator
Air Intake
Category:
navion,
carburator
Applicability: Serial
numbers NAV-4-10 to 20, 22 to 26, 28, 29, 31 to 49, 51, 52, 55 to 58,
60, 63, 73, 76, 79, 82 to 84, 88 to 95, 99 to 104, 106, 108, 110, 112
to 116, 120 to 122, 124, 125, 130, 133, 141, 151, 153, 158, 163,
171.
Supersedes: Was
mandatory Note of AD-782-3
Compliance:
Accomplish prior to August 1, 1947
Procedure:
Some airplanes were delivered with a cork or rubber filler strip
cemented to the upper surface of the 145-42201-71 carburetor air
intake scoop where the scoop fits over the flange of the air mixing
chamber. This strip may becomes dislodged and drawn into the air
induction system. To prevent this, replace the filler strip with a 3
1/8-inch x 5/8-inch dural strip of 0.093-inch thickness,
flush-riveted to the scoop. NAA Field Service Bulletin No. 15 covers
this subject.
AD-47-21-07