AD 78-18-06

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AD Number:
78-18-06
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
LOCKHEED-CALIFORNIA COMPANY Model L-1011-385 Series Airplanes
Subject:
Duct Fire Seal
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
06/25/1979
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Superseded AD: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Superseded By: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: 78-18-06
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-3498

AD NUMBER:   78-18-06

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

ACTION:  

SUMMARY:  

DATES:   Effective June 25, 1979.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
78-18-06 LOCKHEED-CALIFORNIA COMPANY: Amendment 39-3296 is further amended by amendment 39-3498. Applies to Lockheed-California Company Model L-1011-385 Series airplanes certificated in all categories.

Compliance required as indicated, unless previously accomplished.

To prevent the transfer of potentially hazardous quantities of vapors from the engine compartment into the afterbody of the airplane, accomplish the following:

(a) For airplanes with 7500 or more hours total time in service on the effective date of this AD, within the next 1000 hours time in service, inspect the center engine "S" duct flexible fire seal Part No. 1506933-101 per paragraph (c) below.

(b) For airplanes with less than 7500 hours total time in service on the effective date of this AD, prior to the accumulation of 8500 hours total time in service, inspect the center engine "S" duct flexible fire seal per paragraph (c) below.

(c) Visually inspect the center engine "S" duct flexible fire seal for depth of groove and/or tears per the procedures set forth in paragraph 2.A of Lockheed California Service Bulletin 093-54-030 dated March 28, 1978 (hereinafter referred to as SB 093-54-030).

NOTE: Service Bulletin 093-54-030 dated March 28, 1978 and Service Bulletin 093-54-030, Revision 1, are suitable for demonstrating compliance with paragraphs (c) through (h) of this AD.

(d) If there are no tears, and evidence of grooving is observed, or if groove depth is determined to be less than 0.035 inch using the procedures of paragraph 2.A of SB 093-54-030, the seal may be retained in service with performance of repetitive inspections at intervals not to exceed 1500 hours total time in service.

(e) If there are no tears and seal is worn to a groove depth greater than 0.035 inch but less than 0.050 inch:

(1) Continue worn part in service and reinspect within 1000 hours additional time in service; or

(2) Repair seal per paragraph 2.C of Service Bulletin 093-54-030 dated March 28, 1978 or per paragraph 2.D of Service Bulletin 093-54-030, Revision 1, and reinspect within 8500 hours additional time in service; or

(3) Replace seal with like serviceable part per paragraph 2.B of SB 093-54- 030 and reinspect per paragraph 2.A of SB 093-54-030 within 8500 hours additional time in service.

(f) If seal is worn to a groove depth equal to or greater than 0.050 inch but is intact, within 500 hours additional time in service, repair seals per paragraph 2.C of SB 093-54-030 or replace seal per paragraph 2.B of SB 093-54-030 and reinspect per paragraph 2.A of SB 093-54- 030 within 8500 hours additional time in service.

(g) If seal is worn through or torn, within 250 hours additional time in service repair seal per paragraph 2.C of SB 093-54-030 or replace seal per paragraph 2.B of SB 093-54-030 and reinspect per paragraph 2.A of SB 093-54-030 within 8500 hours additional time in service.

(h) Actions required per this AD may be terminated when chafing protection (Belt Assembly Part Number 1619429-101) is installed per paragraph 2.D of SB 093-54-030 in conjunction with a new, used, or repaired center engine "S" duct flexible fire seal which meets the criteria of paragraph (d) or (e)(2) of this AD. Revert to routine maintenance/inspection practices.

(i) Equvalent inspection procedures and repairs may be used when approved by the Chief, Aircraft Engineering Division, FAA Western Region.

(j) Special flight permits may be issued in accordance with FARs 21.197 and 21.199 to operate aircraft to a base for accomplishment of inspections and/or maintenance required by paragraph (b) of this AD.

(k) Upon request of operator, an FAA maintenance inspector, subject to prior approval of the Chief, Aircraft Engineering Division, FAA Western Region may adjust the initial and repetitive inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for that operator.

Amendment 39-3296 became effective October 13, 1978.

This amendment, 39-3498, becomes effective June 25, 1979.

FOOTER: