77-18-07 LOCKHEED-CALIFORNIA COMPANY: Amendment 39-3035. Applies to Lockheed-California Company Model L-1011-385 Series airplanes certificated in all categories.
Compliance required as indicated.
To prevent take-off with a possible jammed elevator drive system on the horizontal stabilizer of the primary pitch control system which can result in degradation of the airplane controllability, accomplish the following:
(a) Initiate the following check program prior to next flight after the effective date of this amendment, until the repetitive or the one-time modification requirements of the paragraph (d) have been accomplished on all aircraft of each operator's fleet:
(1) Prior to each take-off conduct an exterior visual check of the elevator/stabilizer surface positions after the full aft controls check and with the control column full forward to assure there is no obvious discrepancy between elevator positions. The pilot in command shall be informed of the results ofthis check.
(2) If obvious discrepancy noted, correct prior to further flight.
(3) No further full aft control column movement may be performed prior to take-off.
NOTES: (1) This check can be accomplished with any one single hydraulic system pressurized by any main hydraulic system pump.
(2) FAA approved Lockheed-California Company Alert Service Bulletin 093- 27-A158, Revision 1 dated August 17, 1977, Paragraph 2.A, covers the same subject.
(b) Within the next thirty days after the effective date of this amendment, unless already accomplished, revise the FAA Approved Lockheed L-1011 Airplane Flight Manual (AFM), LR 25925, to incorporate the Pitch Axis Control Assist Procedures contained in the AFM revision dated June 17, 1977. Flight crews should be informed of these procedures as soon as practicable.
(c) Within the next 150 hours time in service after the effective date of this amendment, unless already accomplished, inspect the elevator quadrant bearingsin accordance with the applicable instructions of the FAA approved Lockheed-California Company Alert Service Bulletin 093-27-A158, Revision 1, dated August 17, 1977 or later FAA approved revisions.
(1) The upper and lower bearings which do not meet the specified acceptable inspection standards must be replaced prior to next flight.
(2) Those inspections accomplished prior to August 17, 1977 will be considered acceptable provided the inspection standards used are equivalent to those specified in the above service bulletin.
NOTE: The inspections accomplished in accordance with the requirements of AD 77-10- 04 are not considered to be equivalent to the inspections required by the paragraph (c), above.
(d) Within the next 1500 hours time in service after the effective date of this amendment, or on or before March 1, 1978, whichever occurs first, unless already accomplished, accomplish either (1) or (2), below.
(1) Modify the elevator drive systems in accordance with the instructions of Paragraph 2.E of FAA approved Lockheed-California Company Alert Service Bulletin 093-27- A158, Revision 1 dated August 17, 1977, or later FAA approved revisions, except as provided in paragraph (e), below. Accomplish this modification at intervals not to exceed 2000 hours time in service; or
(2) Modify the elevator drive systems in accordance with the instructions of the FAA approved Lockheed-California Company Service Bulletin 093-27-158, dated August 10, 1977 or later FAA approved revisions.
(e) The initial modification performed in accordance with the requirements of paragraph (d)(1) need not include the installation of the thrust washer, P/N 1616733-103. However, at the next subsequent modification required by paragraph (d)(1) the installation of the thrust washer, P/N 1616733-103, is required.
(f) Equivalent checks, inspections and modifications may be used when approved by Chief, Aircraft Engineering Division, FAA Western Region.
This supersedes Amendment 39-2898 (42 FR 24721), AD 77-10-04, and Amendment 39- 2956 (42 FR 34865), AD 77-14-06.
This amendment becomes effective September 15, 1977.