78-26-11 PIPER AIRCRAFT CORPORATION: Amendment 39-3380. Applies to Piper PA-31-350 Navajo Chieftain aircraft, Serial Numbers 31-5001 through 31-7852151, certificated in all categories.
Compliance required within the next 25 hours of operation after the effective date of this AD.
To insure free operation of the elevator control system, accomplish the following:
1. Install cable guide tube, Piper Part Number 71045-2, around the lightening hole in the frame at Fuselage Station 87.50, in accordance with the "Instructions" section of Piper Service Bulletin 621, dated October 13, 1978, or later edition approved by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region.
2. Install nylon spiral sleeving around hydraulic line in accordance with the above referenced instructions.
3. Adjust elevator control cable tension in accordance with the above referenced instructions and instructions contained in the Piper PA-31-350 Navajo Chieftain Service Manual.
Compliance with the provisions of this AD may be accomplished in an equivalent manner approved by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region.
This amendment becomes effective January 4, 1979.