AD 85-23-01

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AD Number:
85-23-01
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
LOCKHEED-CALIFORNIA COMPANY Model L-1011-385 Series Airplanes
Subject:
Control System Brake Assy.
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
11/24/1985
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Superseded AD: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Superseded By: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: 85-23-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-5155

AD NUMBER:   85-23-01

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

ACTION:  

SUMMARY:  

DATES:   Effective November 24, 1985.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
85-23-01 LOCKHEED-CALIFORNIA COMPANY: Amendment 39-5155. Applies to Lockheed Model L-1011-385 series airplanes, certificated in any category. Compliance required as indicated, unless previously accomplished. To detect inadequate holding torque on slat asymmetry brakes installed on both LH and RH wings and to take corrective action, accomplish the following:

A. On aircraft having P/N 672157-115 or prior part number brakes:

(1) Conduct a functional test of each P/N 672157-115 or prior part number slat control system brake assembly within 300 flight hours after the effective date of this AD, or 3000 flight hours from the last test, whichever is later. Thereafter, conduct the same test at intervals not to exceed 3000 flight hours from the last test.

(2) If the left and right slat asymmetry brake holding torque measures 1500 inch-pounds or more, but less than 2400 inch-pounds, the airplane may continue in service.

(3) If the left or right slat asymmetry brake holding torque measures less than 1500 inch-pounds, but more than 1300 inch-pounds, the aircraft may be flown in that condition for the time necessary to replace the brake assembly, but not more than 500 flight hours from the time the deficient brake was found.

(4) If the left or right slat asymmetry brake holding torque measures less than 1300 inch-pounds, prior to further flight, replace the brake assembly with one having a holding torque of 1700 inch-pounds or more, but less than 2400 inch-pounds.

B. The following alternate procedure may be applied to P/N 672157-115 or prior part number brakes:

(1) Conduct a functional test within 300 flight hours after the effective date of this AD, or 4000 flight hours from the last test, whichever is later, if the last test substantiated that the brake holding torque was at least 1700 inch-pounds. Thereafter, conduct the same test at intervals not to exceed 4000 flight hours from the last test.

(2) If the left and right asymmetry brake holding torque measures 1700 inch- pounds or more, but less than 2400 inch-pounds, the airplane may continue in service.

(3) If the left or right slat asymmetry brake holding torque measures less than 1700 inch-pounds, but more than 1300 inch-pounds, the aircraft may be flown in that condition for the time necessary to replace the brake assembly, but not more than 500 flight hours from the time the deficient brake was found.

(4) If the left or right slat asymmetry brake holding torque measures less than 1300 inch-pounds, prior to further flight, replace the brake assembly with one having a holding torque of 1700 inch-pounds or more, but less than 2400 inch-pounds.

C. Replace P/N 672157-113 or prior part number brakes with P/N 672157-115 or later part number brakes within one year after the effective date of this AD.

D. On aircraft having P/N 671157-117 (with "lip seal" instead of "O-ring" seal) or later part number brakes:

(1) Conduct a functional test of each P/N 672157-117 or later part number brake assembly within 300 flight hours after the effective date of this AD, or 4000 flight hours from the last test, whichever is later. Thereafter, conduct the same test at intervals not to exceed 4000 flight hours from the last test.

(2) If the left and right asymmetry brake holding torque measures 1500 inch- pounds or more, but less than 2400 inch-pounds, the airplane may continue in service.

(3) If the left or right slat asymmetry brake holding torque measures less than 1500 inch-pounds, but more than 1300 inch-pounds, the aircraft may be flown in that condition for the time necessary to replace the brake assembly, but not more than 500 flight hours from the time the deficient brake was found.

(4) If the left or right slat asymmetry brake holding torque measures less than 1300 inch-pounds, prior to further flight, replace the brake assembly with one having 1700 inch- pounds or more, but less than 2400 inch-pounds of holding torque.

E. Alternative means of compliance with this AD which provide an acceptable level of safety may be used when approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.

F. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for accomplishment of tests or modifications required by this AD.

NOTE: Instructions to accomplish these tests and modifications are found in these Lockheed Service Bulletins:

(1) S/B 093-27-216, Revision 2, dated July 19, 1983, or later when approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.

(2) S/B 093-27-269, dated July 19, 1983, or later when approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.

(3) S/B 093-27-274, dated July 19, 1983, or later when approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.

All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to the 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 at 4344 Donald Douglas Drive, Long Beach, California.

This amendment becomes effective November 24, 1985.

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