AD 78-07-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 Series Airplanes |
Unsafe Condition
Failure of the over-wheelwell fuselage frame(s) lower fittings manufactured with 7075-T6 aluminum alloy material.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect for evidence of cracking using optical inspection aids with a minimum of 2X magnification. If no cracks are found, clean and spray with corrosion inhibiting compound or repair/replace parts as specified. If cracks are found within certain limits, conduct repetitive inspections at specified intervals or repair/replace parts. If cracks exceed limits, replace parts before further flight.
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Compliance Time
Compliance required as indicated, unless already accomplished. For airplanes with 12,000+ hours time in service on effective date: within next 3400 hours time in service or 12 calendar months, whichever occurs earlier, and thereafter at intervals not exceeding 8000 hours time in service or 37 calendar months. For airplanes with less than 12,000 hours: prior to 15,400 hours time in service or 50 calendar months, whichever occurs earlier, and thereafter at intervals not exceeding 8000 hours time in service or 37 calendar months.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
McDonnell Douglas DC-9 and C-9 series airplanes with factory serial numbers 45695-45749, 45770-45799, 45825-45847, 45863-45876, 47000-47386, 47389-47397, 47399-47482, 47484-47514, 47516-47557, 47559-47764, 47769, and 47771.
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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