AD 75-07-03 ACTIVE

75-07-03 LOCKHEED: Amendment 39-2133 as amended by Amendment 39-2744. Applies to L-1011-385-1 series airplanes certificated in all categories.

Compliance required as indicated.

To prevent the possibility of an out-of-trim Autopilot upon manual disconnect from occurring at close proximity to the ground, and to prevent operation at speeds at which the airplane may not meet stability requirements with inoperative MACH TRIM and MACH FEEL systems, and to advise the flight crew of possible incorrect failure annunciations, accomplish the following:

(a) Within 100 hours time in service after the effective date of this AD, unless already accomplished,

(1) Install the following placard in full view of the flight crew, "DUAL PITCH TRIM REQ'D TO 100 FT. FOR A/P USE BELOW 100 FT."

(2) Revise L-1011-385-1, FAA Approved Airplane Flight Manual (AFM) Limitations sections as follows: LR 25925 by incorporating pages 1-6 and 1-7 dated March 6, 1975, or later FAA-approved revisions; and LR 25225 by incorporating pages 1-6.2 and 1-6.3 dated March 6, 1975, or later FAA-approved revisions. Also revise appropriate operations manuals to incorporate the TRIM/FEEL system failure limitations included in the above AFM pages.

(b) An operator may remove the placards and discontinue the instructions imposed by this AD on his fleet of airplanes after the following actions have been accomplished.

(1) All Trim Augmentation Computers, Lockheed P/N 672 443-(105, -107 or -109) in service and in spares inventory are modified per Lockheed Service Bulletin 093-22-069, dated November 26, 1974, or later FAA-approved revisions; and

(2) A system of parts pooling is established to insure that only spares, modified as defined in (b)(1), above, are installed.

(c) The Lockheed Company may operate and deliver an airplane to an operator without the placard required by this AD after the individual operator provides written notification to the Lockheed Company that his fleetno longer requires the placard as provided in (b), above.

(d) All Trim Augmentation Computers, Lockheed P/N 672 443- (105, -107, or -109), must be modified in accordance with Lockheed Service Bulletin 093-22-069, dated November 26, 1974, or later FAA - Approved revisions, by July 1, 1977.

(e) Equivalent procedures and modifications may be approved by the Chief, Aircraft Engineering Division, FAA Western Region.

(f) An airplane may be flown to a base for the performance of the work required by this AD, per FAR's 21.197 and 21.199.

(g) For those airplanes not provided for in paragraph (c), above, the Lockheed Company may operate these airplanes without the placard required by this AD if the following actions are accomplished: (1) A Lockheed P/N 672 443-113 Trim Augmentation Computer or later FAA-approved version is installed; and (2) a sign-off indicating compliance with paragraph (g) of the AD is made on the aircraft release form prior to each flight.

Amendment 39-2133 became effective March 27, 1975.

This Amendment 39-2744 becomes effective October 20, 1976.