AD 85-20-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | L-1011-385-1 | LOCKHEED-CALIFORNIA COMPANY Model L-1011 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-14 | LOCKHEED-CALIFORNIA COMPANY Model L-1011 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-15 | LOCKHEED-CALIFORNIA COMPANY Model L-1011 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-3 | LOCKHEED-CALIFORNIA COMPANY Model L-1011 Series Airplanes |
Unsafe Condition
Potential of major structural damage to the airplane due to flutter divergence as a result of water retention in the elevator trailing edge panels.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect elevator trailing edges for water entrapment using X-ray, moisture meter, or in-situ balance check within 300 hours time-in-service after the effective date. Depending on inspection results, reinspect at intervals of 3,500, 7,000, or 1,100 hours time-in-service, or replace panels before further flight if unbalance exceeds limits. Discontinue inspections after modification per Service Bulletin 093-55-027.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 300 hours time-in-service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Lockheed-California Company Model L-1011 series airplanes incorporating Kevlar/Nomex honeycomb elevator trailing edge panels.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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