AD 91-24-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | MD-11 | Airworthiness Directives: McDONNELL DOUGLAS MD-11 Series Airplanes |
| aircraft | The Boeing Company | MD-11F | Airworthiness Directives: McDONNELL DOUGLAS MD-11 Series Airplanes |
Unsafe Condition
Fatigue cracking and possible structural failure of the outboard flaps due to cracks in the outboard flap inboard and outboard closure rib spindle support fittings and delamination of the upper skin of the outboard flaps.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a borescope inspection of spindle support fittings within 30 days after the AD's effective date or before 400 landings, whichever is later. Conduct a visual inspection of the upper skin for cracks and delamination within 30 days after the AD's effective date. If no issues found, either repeat inspections at specified intervals or modify the fittings as per the service bulletin. If cracks (less than 1 inch) are found, modify fittings or incorporate a permanent repair. For larger cracks or delamination, perform a permanent repair approved by the FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 30 days after the effective date of this AD or prior to the accumulation of 400 landings, whichever occurs later
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Affected Aircraft
McDonnell Douglas MD-11 series airplanes, certificated in any category (models MD-11 and MD-11F)
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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