AD 75-16-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-10-10 | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, DC-10-10F, DC-10-30, DC-10-30F, DC-10-40 Airplanes |
| aircraft | The Boeing Company | DC-10-10F | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, DC-10-10F, DC-10-30, DC-10-30F, DC-10-40 Airplanes |
| aircraft | The Boeing Company | DC-10-30 | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, DC-10-10F, DC-10-30, DC-10-30F, DC-10-40 Airplanes |
| aircraft | The Boeing Company | DC-10-30F (KC-10A, KDC-10) | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, DC-10-10F, DC-10-30, DC-10-30F, DC-10-40 Airplanes |
| aircraft | The Boeing Company | DC-10-40 | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, DC-10-10F, DC-10-30, DC-10-30F, DC-10-40 Airplanes |
Unsafe Condition
Detachment of the flap vane assembly due to insufficient support from the outboard flap vane assembly supports.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct dye penetrant inspection, installation check, and flap actuation per Alert Service Bulletin A57-48. Limit flap settings to 35 degrees and speed to 175 knots when using 35-degree flaps. Affix placards indicating the 175 knot limit. Modify outboard flap vane assembly supports per Service Bulletin 57-48 or 57-51 within specified landing limits, and replace modified parts before 2000 landings.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 150 hours time in service for inspections; within 5 days for placarding; within 450 landings or 2450 landings depending on landing count at AD effective date for modifications; replace parts prior to 2000 landings after modification.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
McDonnell Douglas DC-10-10, DC-10-10F, DC-10-30, DC-10-30F (KC-10A, KDC-10), DC-10-40 airplanes certificated in all categories.
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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