AD 48-06-05

48-06-05 DOUGLAS: Applies to DC-4 and C-54 Aircraft.

Compliance required by November 1, 1948.

To prevent failure of the aileron hinge eyebolts and the rudder trim tab and elevator trim tab hinges and control horns, the following changes must be made:

1. On airplanes having aileron assemblies P/N 5166075, -1, -500, -501, or -503, replace No. 3 hinge eyebolt P/N 1166013 with new eyebolt P/N 1357234. Airplanes having aileron assemblies P/N 5078609, -1, -500, -501, -502, or -503, do not require this hinge replacement.

2. On elevator and rudder trim tabs replace all hinges and control horns with new parts made of steel.

3. Replace the standard AN bolts in elevator trim tab and rudder trim tab hinges and control horns with new special close tolerance high strength bolts using new AN 310 type nuts, AN 960 washers and AN 380 cotter pins.

Inspection should be accomplished in accordance with Note 51-9-2 except in the case of aircraft in which the standard AN rudder and elevator hinge bolts have not been replaced with new close tolerance high strength bolts using new AN 310 type nuts, AN 960 washers and AN 380 cotter pins. In such cases, inspection should be accomplished at intervals not to exceed 1,000 hours.

(Douglas Service Bulletin DC-4 No. 83 covers the above rework.)