AD 2007-25-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 | Airworthiness Directives; Boeing Model 747-400 Series Airplanes |
Unsafe Condition
Cracking and buckling of the forward or rear heat exchanger shell of the air distribution system of the crew rest area, which could result in jamming of the rudder and/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 forward and rear heat exchanger shells of the air distribution system of the crew rest area for discrepancies (cracks, creases, deformation, deflection, and interference with control cables). Replace any discrepant forward or rear heat exchanger shell before further flight. Identify the part number, shop code, and build date of the forward and rear heat exchanger shells, and take applicable corrective actions to eliminate the need for repetitive inspections.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight for Work Package 1 (replacement of discrepant heat exchanger shells). Within 24 months for Work Package 2 (inspection to identify part number, shop code, and build 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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