AD 71-17-09

71-17-09 SCHWEIZER AIRCRAFT: Amdt. 39-1272. Applies to SGS 1-23H. Type Gliders.

To prevent severe oscillations and vibrations resulting from excessively loose rudder fittings accomplish the following:

(a) Within the next 25 hours time in service unless accomplished within the last 75 hours time in service and thereafter at intervals not to exceed 100 hours time in service, inspect the lower and upper rudder and fin hinges P/N 1A-107-2, P/N 23H704-16 & -17, P/N 1A-105-2 and P/N 23H705-21, to assure that neither the fore and aft nor the sidewards free-play exceeds five-thousandths (0.005) inches.

(b) If free-play in excess of the limits set forth in paragraph (a) is found, replace hinges and their connecting bolts with parts of the same part number or with FAA approved equivalent parts; or incorporate a modification described in Schweizer Aircraft Corporation Service Bulletin No. 102-23-2 dated 29 June 1971 or an FAA approved equivalent modification. Equivalent partsor modifications must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.

(c) The compliance times may be increased by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region upon receipt of substantiating data submitted through an FAA Maintenance Inspector.

This amendment becomes effective August 26, 1971.