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