AD 2001-18-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 | Airworthiness Directives; Boeing Model 747-400 Series Airplanes |
Unsafe Condition
Cracking and buckling of the front edge of the crew rest heat exchanger, which could result in a jam of the rudder or elevator control cables, and consequent reduced controllability of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the part number and shop code of the shell of the crew rest heat exchanger. If the shell has a certain part number and shop code, or if the shop code cannot be determined, remove the shell assembly, measure the thickness of the wall adjacent to the forward flange, remark the part if necessary, and replace the shell assembly with a new one if necessary.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 18 months of the effective date.
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Affected Aircraft
Boeing Model 747-400 series airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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