AD 51-21-03

51-21-03 LUSCOMBE: Applies to Model 11A Airplanes.

Compliance required prior to 50 hours additional flight time and not later than October 15, 1951, and each 50 hours thereafter unless Luscombe P/N 11-5417-D is installed.

Inspect rudder control system bellcrank, P/N 11-5417, located under forward cabin floor, for cracks, loose rivets, or deformation. If this bellcrank is damaged in any way, it must be repaired or replaced with the late type, P/N 11-5417-D.

The early type bellcrank may be identified by its having four rivets or four AN 3 bolts attaching the center bearing block to the bellcrank. The late type bellcrank has 10 rivets attaching the center bearing block to the bellcrank, and this bearing block is longer to accommodate the added rivets.

If the early type bellcrank is installed and is found undamaged, or is repaired and reinstalled, this inspection must be repeated each 50 hours of flight time. If the late type bellcrank is found to be installed, or is installed to replace the early type, only routine maintenance inspections are required.

In installing either type of bellcrank in the rudder system, the system must be rigged in accordance with Luscombe Airplane Corp., Drawing 11-5402. Care must be taken not to overtension the rudder cables, since this overtensioning can cause failure of the bellcrank.