AD 2001-23-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747 | Airworthiness Directives; Boeing Model 747 Series Airplanes |
Unsafe Condition
Discrepancies in the installation of the midspar fuse pins of the inboard and outboard struts, which could result in loss of the secondary retention capability of the fuse pins, migration of the fuse pins, and consequent loss of the strut and engine from the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the installation of the midspar fuse pins of the inboard and outboard struts for discrepancies, as specified in the AD. If discrepancies are found and the primary nut has backed off and contacts the secondary retention washer, perform the terminating modification before further flight. If discrepancies are found but the primary nut does not contact the secondary retention washer, repeat inspections at intervals not exceeding 90 days and perform the terminating modification within 18 months after the initial finding or before March 21, 2001, whichever is later. The terminating modification involves replacing the primary nut of the midspar fuse pin, installing a torque strip, conducting a detailed visual inspection of the fuse pin threads for damage, and replacing them if necessary.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 6 years after the effective date of the AD (December 31, 2001) for the terminating modification.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 747 series airplanes, line numbers 1 through 1046 that have accomplished Airworthiness Directives 95-10-16, 95-13-05, 95-13-06, or 95-13-07; and line numbers 1047 through 1271 inclusive, 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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