81-26-51 R3 LOCKHEED-CALIFORNIA COMPANY: Amendment 39-4328 as amended by Amendment 39-4555 is further amended by Amendment 39-4722.
Applies to Lockheed Model L-1011-385 series airplanes, serial numbers 1052 and subsequent, certificated in all categories.
Compliance is required as indicated, unless previously accomplished.
To detect cracks in the Fuselage Station (FS) 1363 bulkhead lower caps, fuselage skin, adjacent web, and web horizontal stiffeners; and to prevent failure and possible sudden decompression of the airplane, accomplish the following:
A. Compliance Schedule:
1. Compliance is required within 300 landings after the effective date of this AD for the inspection specified in paragraph C., below, on all aircraft having accumulated 10,000 or more landings, as of the effective date of this AD. Previously accomplished inspections per paragraph B. or F., below, or per Accomplishment Instructions, Section 2, of Lockheed L-1011 Service Bulletin 093-53-208, Revision 1, dated December 23, 1981, or later revisions approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region, satisfy this initial inspection requirement.
2. Aircraft having accumulated less than 10,000 landings as of the effective date of this AD amendment must have an initial inspection as specified in paragraph C. below prior to accumulating 10,300 landings.
3. Repetitive inspections in accordance with paragraph C., below, are required on all affected aircraft until the permanent modification specified in Section 2, Accomplishment Instructions, of Lockheed L-1011 Service Bulletin 093-53-207, Revision 1, dated October 12, 1982, or later revisions approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region, is accomplished which terminates the repetitive inspections required by this AD.
(a) If the initial inspection was accomplished in accordance with paragraph B. below, within an additional 300 landings after the initial inspection, or within 100 landings after the effective date of this amendment, whichever is later, inspect internally at intervals not to exceed 2000 landings and externally at intervals not to exceed 600 landings thereafter in accordance with paragraph C. below.
(b) If the initial inspection was accomplished in accordance with Accomplishment Instructions, Section 2, of Lockheed L-1011 Service Bulletin 093-53-208, Revision 1, dated December 23, 1981, within an additional 600 landings after the initial inspection, or within 300 landings after the effective date of this amendment, whichever is later, inspect internally at intervals not to exceed 2000 landings and externally at intervals not to exceed 600 landings thereafter in accordance with paragraph C. below.
(c) The 2000 landings internal inspection intervals may be increased to 4000 landings if the external support angle (P/N 1561639) is also inspected in accordance with Section 2,Accomplishment Instructions, of Lockheed L-1011 Service Bulletin 093-53-209, dated October 27, 1981, and no damage is found.
(d) Any area with bulkhead cap repairs must be inspected at an interval not to exceed 500 landings. If the bulkhead cap repair had been accomplished prior to the effective date of this AD, the next X-ray inspection to the bulkhead cap must be accomplished within 500 landings from the date of the repair or within 500 landings from the last X-ray inspection, whichever is earlier.
B. Accomplishment Instruction - Option 1:
1. Remove both main landing gear fairing panels 195B, left hand side and 196B right hand side, or remove splash panels, Lockheed L-1011 P/N 1541920-101 and -102, and
2. Perform a close visual inspection for cracks in Fuselage Station 1363 bulkhead, left hand side. Inspect from the main landing gear wheel well, paying particular attention to web and horizontal stiffeners at bulkhead cap, above and below water line 140.
3.Perform a close visual inspection for cracks in fuselage skin between Fuselage Stations 1363 and 1403, left hand side, paying particular attention to the area between Stringers 44 and 46.
4. Perform a close visual inspection for cracks in Fuselage Station 1363 bulkhead, right hand side. Inspect from the main landing gear wheel well, paying particular attention to the web and horizontal stiffeners at the bulkhead cap, above and below water line 140.
5. Perform a close visual inspection for cracks in the fuselage skin between Fuselage Stations 1363 and 1403, right hand side, paying particular attention to the area between Stringers 20 and 22.
Or, in lieu of B.1. thru B.5.
6. Inspect for cracks in FS 1363 bulkhead cap and surrounding areas in accordance with the inspection procedure called out in Section 2, Accomplishment Instructions, of Lockheed Service Bulletin 093-53-206, Revision 1, dated October 19, 1981, or Accomplishment Instructions, Section 4 or 5 of Lockheed L-1011 Service Bulletin 093-53-A212, dated December 7, 1981.
C. Accomplishment Instructions - Option 2
Inspect for cracks in FS 1363 bulkhead cap and surrounding areas in accordance with the inspection procedures specified in Section 2, Accomplishment Instructions, of Lockheed L-1011 Service Bulletin 093-53-228, dated April 22, 1983, or later revisions approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.
D. If cracks are found in the lower cap, adjacent web, fuselage skin, or web stiffeners, they must be repaired before further flight in a manner approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.
E. If cracks are found only in the Lockheed P/N 1518531-121 reinforcing strap and not repaired, reinspect externally in accordance with paragraph C., above, at intervals not to exceed 250 landings until a repair or permanent modification is incorporated in a manner approved by theManager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.
F. Alternate means of compliance which provide an equivalent level of safety may be used when approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.
G. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the inspection requirements of this AD.
The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1).
All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Lockheed-California Company, P.O. Box 551, Burbank, California 91520, Attention: Commercial Support Contracts, Dept. 63-11, U-33, B-1. These documents also may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Los Angeles Aircraft Certification Office, 4344 Donald Douglas Drive, Long Beach, California.
Amendment 39-4328 became effective March 11, 1982, and was effective earlier to those recipients of Telegraphic AD T81-26-51, dated December 11, 1981.
Amendment 39-4555 became effective February 9, 1983.
This Amendment 39-4722 becomes effective September 21, 1983.