AD Amdt-39-9867
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747 | Airworthiness Directives; Boeing Model 747 Series Airplanes |
Unsafe Condition
Fatigue cracking of the fuselage frames at body stations 300 and 320 adjacent to the nose wheel well (NWW), which could result in collapse of the NWW pressure bulkhead and subsequent rapid decompression of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a one-time inspection to detect fatigue cracking of the vertical beam webs and chords of the NWW at BS 300 and BS 320, and repair if necessary. Conduct repetitive visual inspections to detect fatigue cracking of the inner chord and web of the fuselage frames at BS 300 and BS 320, from the NWW side panel outboard to stringer 39, and repair any detected cracking.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to the accumulation of 10,000 total flight cycles or within 50 flight cycles after the effective date of this AD, whichever occurs later.
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Affected Aircraft
Boeing Model 747 series airplanes with line numbers 1 through 678 inclusive where the Section 41 frame replacement in zone 1 per Boeing Service Bulletin 747-53-2272 has not been accomplished.
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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