AD 91-26-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, and -50 Series Airplanes and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, and -50 Series Airplanes and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, and -50 Series Airplanes and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, and -50 Series Airplanes and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, and -50 Series Airplanes and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, and -50 Series Airplanes and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, and -50 Series Airplanes and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, and -50 Series Airplanes and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, and -50 Series Airplanes and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-10, -20, -30, -40, and -50 Series Airplanes and C-9 (Military) Series Airplanes |
Unsafe Condition
Failure of the tailcone release system due to cracked or broken tailcone release handles.
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Required Actions
Inspect interior and exterior tailcone release handles for cracks and conduct functional tests within 60 days after February 11, 1991. Replace cracked or broken handles before further flight. Repeat inspections and tests every 3,000 flight hours or 15 months, whichever comes first. Replace or modify cable and handle assemblies within 90 days after February 17, 1992, per Service Bulletin 53-245. Report discrepancies within 30 days. Continue functional tests after modifications.
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Compliance Time
Within 60 days after February 11, 1991 (for initial inspection and functional test); within 90 days after February 17, 1992 (for cable and handle replacement/modification); repeat inspections and tests at intervals not exceeding 3,000 flight hours or 15 months, whichever occurs first.
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Affected Aircraft
McDonnell Douglas DC-9-10, -20, -30, -40, -50 series and C-9 (Military) series airplanes operating in passenger or passenger/cargo configuration.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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