AD 2001-17-24
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 707 and 720 | Airworthiness Directives; Boeing Model 707 and 720 Series Airplanes |
Unsafe Condition
Fatigue cracking of the front spar fitting on the outboard engine nacelle, which could reduce the structural integrity of the nacelle and result in separation of the engine from the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install the preventive modification of the front spar fitting on the outboard engine nacelle according to Boeing Service Bulletin 1541, Revision 3, dated February 15, 1967. This includes replacing the front spar fitting with a new, improved fitting and modifying the front spar chord to distribute stress loads over the entire front spar fitting.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 24 months after the effective date of this AD, or prior to the accumulation of 20,000 total flight cycles, whichever occurs later.
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Affected Aircraft
Boeing Model 707 and 720 series airplanes, as listed in Boeing Service Bulletin 1541, Revision 3, dated February 15, 1967; 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 6, 2026
Rights: U.S. Government Public Domain
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