AD 76-09-07

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AD Number:
76-09-07
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
LOCKHEED-CALIFORNIA COMPANY Model L-1011-385 Series Airplanes
Subject:
S-Duct Assembly
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
05/10/1976
Make:
Lockheed Martin Corporation
Model:
L-1011-385-1 | L-1011-385-1-14 | L-1011-385-1-15 | L-1011-385-3
Product Type:
Aircraft
Product Subtype:
Large Airplane
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 76-09-07
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-2596

AD NUMBER:   76-09-07

SUBJECT HEADING:   LOCKHEED-CALIFORNIA COMPANY Model L-1011-385 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective May 10, 1976.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
76-09-07 LOCKHEED-CALIFORNIA COMPANY: Amendment 39-2596. Applies to Lockheed-California Company Model L-1011-385 series airplanes, certificated in all categories, that have a Part I configuration center engine S-duct installed (See NOTE).

Compliance required as indicated.

To prevent possible separation of the center engine S-duct assembly due to failure of the articulating joints, accomplish the following:

(a) For airplanes with 4,500 or more hours' time in service on July 14, 1975, comply with paragraphs (c) and (d) within the next 250 hours' time in service after July 14, 1975 unless already accomplished.

(b) For airplanes with less than 4,500 hours' time in service on July 14, 1975, comply with paragraphs (c) and (d) within the next 250 hours' time in service after July 14, 1975 or before the accumulation of 4,500 hours' time in service, whichever occurs later, unless already accomplished.

(c) Accomplish the following actions in accordance with paragraphs 2A(1) and 2A(2) of Lockheed Alert Service Bulletin 093-54-A019, Revision 2, dated April 20, 1976, or later FAA- approved revision, or an FAA-approved equivalent.

(1) Visually inspect all alignments units (leaf springs and spring cartridges) installed at the forward articulating joint of the S-duct assembly for damaged units or worn attachment holes; and, if damage is found, repair, as necessary.

(2) Visually inspect the forward ring of S-duct assembly articulating joint, for cracks at all alignment unit locations. If cracks are found, either accomplish the modifications described in paragraph (f), below, or repair, as necessary, before further flight.

(d) Accomplish the following actions in accordance with paragraphs 2A(3) or 2A(4) or 2A(5) of Lockheed Alert Service Bulletin 093-54-A019, Revision 2, dated April 20, 1976, or later FAA-approved revision, or an FAA-approved equivalent.

(1) Inspect the upper half of the forward ring on the aft side of the S-duct assembly articulating joint for cracks using a dye penetrant method.

(2) If cracks are found, either accomplish the modifications described in paragraph (f), below, or repair, as necessary, before further flight.

(e) Until the center engine S-duct modifications of paragraph (f) have been accomplished, repeat compliance with the inspection and repair requirements of paragraphs (c) and (d) at intervals not to exceed 800 or 1600 or 2400 hours' time in service since the last inspection, whichever is appropriate, in accordance with the conditions and repetitive inspection interval criteria established by paragraphs 2A(1), 2A(2), and 2A(3) or 2A(4) or 2A(5) of Lockheed Alert Service Bulletin 093-54-A019, Revision 2, dated April 20, 1976, or later FAA-approved revision or an FAA-approved equivalent.

(f) The repetitive inspections required by paragraph (e) may be discontinued after the center engine S-duct forward articulating joint is modified in accordance with Part I of Lockheed Service Bulletin 093-54-019, dated November 4, 1975, or later FAA-approved revision, or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region.

(g) Special flight permits may be issued in accordance with FAR's 21.197 and 21.199 to operate airplanes to a base where the inspections required by this AD can be performed.

NOTE: For the purpose of determining applicability, Part I configuration center engine S- ducts are identified as those utilizing two leaf spring and twelve spring cartridge type alighment units around the forward articulating joint as described by Lockheed Alert Service Bulletin 093-54- A019. Part I configuration S-duct may be found on, but not necessarily limited to, aircraft serials 1002 through 1037.

This supersedes Amendment 39-2256, AD 75-14-07, as amended by Amendments 39- 2299 and 39-2360. Compliance with AD 75-14-07 may be credited for compliance with either the initial inspection requirements of paragraph (a) or (b) and the repetitive inspection requirements of paragraph (e).

This amendment becomes effective May 10, 1976.

FOOTER: