AD 90-25-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-81 (MD-81) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) Series Airplanes, and Model MD-88 Series Airplanes |
| aircraft | The Boeing Company | DC-9-82 (MD-82) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) Series Airplanes, and Model MD-88 Series Airplanes |
| aircraft | The Boeing Company | DC-9-83 (MD-83) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) Series Airplanes, and Model MD-88 Series Airplanes |
| aircraft | The Boeing Company | DC-9-87 (MD-87) | Airworthiness Directives; McDONNELL DOUGLAS DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) Series Airplanes, and Model MD-88 Series Airplanes |
| aircraft | The Boeing Company | MD-88 | Airworthiness Directives; McDONNELL DOUGLAS DC-9-81, -82, -83 and -87 (MD-81, -82, -83, and -87) Series Airplanes, and Model MD-88 Series Airplanes |
Unsafe Condition
The engine forward mount cone bolts may have incorrect part numbers or indications of shear section cut-out, which could cause the engine to depart the aircraft during a hard landing, sudden engine seizure, or when encountering high velocity vertical gusts during flight.
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Required Actions
Within 30 days after the effective date, perform a one-time visual or ultrasonic inspection of both engine forward mount cone bolts to verify correct part numbers (Barry K2219-9SA3 or McDonnell Douglas 7938004-503). Replace incorrect or defective bolts before further flight. Incorporate a maintenance program revision requiring visual or ultrasonic inspections at each engine change, replacing incorrect bolts before engine installation.
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Compliance Time
Within 30 days after the effective date of this AD, unless accomplished since December 21, 1989.
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Affected Aircraft
McDonnell Douglas DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and Model MD-88 series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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