AD 85-23-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | L-1011-385-1 | LOCKHEED-CALIFORNIA COMPANY Model L-1011-385 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-14 | LOCKHEED-CALIFORNIA COMPANY Model L-1011-385 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-15 | LOCKHEED-CALIFORNIA COMPANY Model L-1011-385 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-3 | LOCKHEED-CALIFORNIA COMPANY Model L-1011-385 Series Airplanes |
Unsafe Condition
Inadequate holding torque on slat asymmetry brakes installed on both left and right wings could lead to uncommanded movement of the slat control system, resulting in potential loss of control.
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Required Actions
Conduct functional tests of slat control system brake assemblies at specified intervals, replace brakes with part numbers 672157-115 or later within one year, and ensure holding torque meets specified ranges (1500-2400 inch-pounds) or replace if below thresholds.
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Compliance Time
Within 300 flight hours after the effective date (November 24, 1985) or specified flight hours from the last test, whichever is later. Replacement of P/N 672157-113 or prior brakes must be done within one year after the effective date.
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Affected Aircraft
Lockheed-California Company Model L-1011-385 series airplanes, including L-1011-385-1, L-1011-385-1-14, L-1011-385-1-15, and L-1011-385-3, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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