AD 64-04-06

64-04-06 PRATT READ: Amdt. 685 Part 507 Federal Register February 12, 1964. Applies to All Model PR-G1 Gliders.

Compliance required as indicated.

Due to a deteriorating condition of the wood structure supporting the aft elevator bellcrank, resulting in loss of elevator control, accomplish the following within 25 hours' time in service after the effective date of this AD unless already accomplished within the last 75 hours' time in service, and at intervals thereafter not to exceed 100 hours' time in service from the last inspection, or one year, whichever occurs first.

(a) Remove the stabilizer and elevators and any other obstructing structure necessary to gain access to the aft internal fuselage area (tail cone section).

(b) With the use of a light and mirror, visually inspect for deterioration both the front and rear side of the wood bulkhead in the vicinity of its support of the aft elevator bellcrank.

(c) If indications of deterioration of the wood structureare found, repair that bulkhead in accordance with an FAA approved repair before further flight, or replace with a part having the same part number, or an FAA approved equivalent before further flight.

NOTE: After installation of a new or repaired bulkhead, it should be ascertained that the elevator is functioning properly throughout the entire range.

This directive effective March 13, 1964.