AD 79-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-10-10 | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, -10F, and -40 Series Airplanes |
| aircraft | The Boeing Company | DC-10-10F | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, -10F, and -40 Series Airplanes |
| aircraft | The Boeing Company | DC-10-40 | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, -10F, and -40 Series Airplanes |
Unsafe Condition
Failures of the bolts attaching the aft engine mount to the pylon bulkheads of the Number 1, 2, and 3 engines on the DC-10-10 and -10F, and the Number 1 and Number 3 engines of the DC-10-40 airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Check the integrity of each of the four main aft mount to pylon bulkhead bolts using a box wrench. Replace bolts if any nut movement is detected. Inspect bolts within 600 hours' time in service after the effective date and every 3,600 hours thereafter following Service Bulletin 54-72. Discontinue inspections after installing inconel bolts specified in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight, within 600 hours' time in service after the effective date, and thereafter at intervals not to exceed 3,600 hours' time in service.
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Affected Aircraft
McDonnell Douglas Model DC-10-10, -10F, and -40 Series airplanes certificated in all categories with more than 3,000 hours' total time in service.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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