AD 91-11-02
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 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 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 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 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 Airplanes |
Unsafe Condition
Damage to the engine, cone bolts, and pylon, or separation of an engine from the airplane, as a result of the loss of a through-bolt.
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Required Actions
Inspect the through-bolt nut (P/N SPS83978-1216) for proper torque and conditions per MD-80 Alert Service Bulletin A71-51. Depending on discrepancies found (misaligned torque stripe, torque below 250 in-lb, missing components, etc.), actions include removing/replacing the nut, applying torque, reinstalling components, or repairing with FAA approval. Repeat inspections every 30 calendar days. Install castellated nuts and cotter pins within 18 months of AD effective date to terminate repetitive inspections.
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Compliance Time
Within seven days after August 29, 1990 (the effective date of Amendment 39-6684, AD 90-12-51). Repeat inspections at intervals not exceeding 30 calendar days. Castellated nuts/cotter pins installation within 18 months after the effective date of this AD (June 24, 1991).
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Affected Aircraft
McDonnell Douglas Model DC-9-81 (MD-81), -82 (MD-82), -83 (MD-83), -87 (MD-87) series airplanes and Model MD-88 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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