AD 80-03-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9, Series 10, 20, 30, 40, and 50 Airplanes and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9, Series 10, 20, 30, 40, and 50 Airplanes and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9, Series 10, 20, 30, 40, and 50 Airplanes and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9, Series 10, 20, 30, 40, and 50 Airplanes and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9, Series 10, 20, 30, 40, and 50 Airplanes and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9, Series 10, 20, 30, 40, and 50 Airplanes and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9, Series 10, 20, 30, 40, and 50 Airplanes and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9, Series 10, 20, 30, 40, and 50 Airplanes and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9, Series 10, 20, 30, 40, and 50 Airplanes and C-9 Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9, Series 10, 20, 30, 40, and 50 Airplanes and C-9 Series Airplanes |
Unsafe Condition
Fire hazard caused by possible accumulation of fuel from APU false-starts collecting on lower aft fuselage inner surface.
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Required Actions
Verify and clean the area adjacent to the fuselage drain hole at the 5 o'clock position, check and clean for spilled fuel in the tail compartment before APU restart. Record APU false starts, install cockpit placard, revise AFM, and incorporate APU exhaust system modification per Service Bulletin 49-25 within one year.
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Compliance Time
Within the next 100 hours' time in service from the effective date, and thereafter intervals not to exceed 250 hours' time in service. The APU exhaust modification must be done within one year's time in service from the effective date.
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Affected Aircraft
McDonnell Douglas Model DC-9, Series 10, 20, 30, 40, and 50 airplanes and Military C-9 series airplanes not incorporating Service Bulletin 49-25 or its production equivalent.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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