AD 76-14-04

76-14-04 LOCKHEED-CALIFORNIA COMPANY: Amendment 39-2668. Applies to Model L-1011-385 series airplanes, certificated in all categories.

Compliance required as indicated.

To prevent in-flight losses of the main landing gear fixed and hinged strut doors, the requirements of paragraphs (a) and (b) must be accomplished until the modification of paragraph (c) is performed.

(a) Within the next 300 hours' time in service after the effective date of this AD, unless the modification of paragraph (c) is already accomplished, accomplish the following:

(1) Modify the existing landing gear maximum extend speed placard in the airplane flight station to reduce the approved landing gear maximum extend speed (VLE) from 300 KIAS/0.85M to 250 KIAS/0.73M.

(2) Amend the Limitations Section of the Lockheed L-1011 FAA Approved Airplane Flight Manual, LR 25925, as follows:

"Landing Gear Operating Speed, VLO:

Extension, 250 KIAS/O.73M

Landing Gear Extended Speeds, VLE: 250 KIAS/0.73M

The Landing Gear Operating Speed, VLO, and Landing Gear Extended Speed, VLE is 300 KIAS/O.85M when FAA-approved Lockheed Service Bulletins 093-52-010, 093-52-050, 093-52- 051, 093-52-074, and 093-52-078 are accomplished, as applicable."

(3) Amend the Limitations Section of Appendix 7 of the Lockheed L-1011 FAA Approved Airplane Flight Manual, LR 25925, to add the following limitations:

"Flights with landing gear extended in accordance with this Appendix are prohibited unless paragraphs (i) or (ii) or (iii), below, are accomplished:

(i) FAA-approved Lockheed Service Bulletins, 093-52-010, 093-52- 050, 093-52-051, 093-52-074 and 093-52-078 are accomplished, as applicable.

(ii) VMO is reduced to 250 KIAS, and an FAA-approved airspeed/Mach indicator with a maximum speed pointer set at 250 KIAS is installed, and the FAA- approved aural overspeed warning is reset for 250 KIAS.

(iii) All main landing gear fixed and hinged strut doors are removed prior to flight."

(b) Within the next 800 hours' time in service after the effective date of this AD, and at 800 hours' time in service intervals thereafter, perform visual integrity inspections of the main landing gear fixed and hinged strut doors in accordance with instructions of the L-1011 Maintenance Manual, Sections 32-12-02 and 32-12-03 dated June 23, 1976 or later FAA- approved revisions, and accomplish repairs and replacements as necessary.

(c) Within the next 9000 hours' time in service after the effective date of this AD, unless already accomplished, modify the main landing gear fixed and hinged strut doors by incorporation of the following FA-approved Lockheed-California Company Service Bulletins, as applicable, or later FAA-approved revisions or equivalent modifications approved by the Chief, Aircraft Engineering Division, FAA, Western Region.

Service Bulletin Date 093-52-010 June 12, 1972 093-52-050 May 27, 1975 093-52-051 December 7, 1973 093-52-074October 7, 1975 093-52-078 June 16, 1975

(d) The requirements of paragraphs (a) and (b) may be removed after the modification of paragraph (c) has been accomplished.

Equivalent modifications and replacements may be approved by the Chief, Aircraft Engineering Division, FAA, Western Region.

Airplanes may be flown to a base for the accomplishment of the modifications required by this AD, per FAR's 21.197 and 21.199, provided the requirements of paragraph (a) are observed.

This amendment becomes effective July 14, 1976.