AD 77-21-03

77-21-03 PIPER: Amendment 39-3056. Applies to Model PA-36-285, Serial Nos. 36-7360001 through 36-7760003 certificated in all categories.

To prevent hazards in flight associated with rudder spar cracks, accomplish the following:

(a) Within the next 50 hours in service from the effective date of this AD unless previously accomplished within the past 50 hours in service and at intervals not to exceed 100 hours in service from the last inspection, inspect the rudder spar at hinge attachment points for cracks using a magnifying glass of at least ten power.

(b) If cracks exist replace the rudder assembly with a new rudder assembly Piper Part No. 98125-04 or equivalent.

(c) Upon the incorporation of rudder assembly, Piper Part No. 98125-04 or equivalent, compliance with the requirements of this AD may be dispensed with.

(d) Equivalent inspection and repairs must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.

(e) Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region may adjust the inspection intervals specified in this AD.

(Piper Service Bulletin No. 518 refers to this subject.)

This amendment is effective October 18, 1977.