AD 99-22-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
Unsafe Condition
Deflection or interference of crew rest area heat exchangers with flight control cables due to failed nutplate attachment rivets made of lower-strength 1100-F aluminum instead of specified 2017-T4 aluminum, which could result in reduced maximum rudder and elevator surface deflection and reduced controllability.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the crew rest area heat exchangers for deflection or interference with flight control cables. Inspect heat exchanger panels, pitot-static tubes, and air distribution ducts for damage. Replace nutplate attachment rivets with stronger rivets if they are made of 1100-F aluminum. Repair damage as directed by manufacturer under FAA approval.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 400 flight hours or 30 days after the effective date of the AD, whichever occurs earlier.
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Affected Aircraft
Boeing Model 747-400 series airplanes as listed in Boeing Alert Service Bulletin 747-53A2430, including 747-400D and 747-400F series, certificated in any category.
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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