AD 89-21-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | Airworthiness Directives; BOEING Model 727, 737-100, -200, and -200C Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | Airworthiness Directives; BOEING Model 727, 737-100, -200, and -200C Series Airplanes |
| aircraft | The Boeing Company | 727-200 Series | Airworthiness Directives; BOEING Model 727, 737-100, -200, and -200C Series Airplanes |
| aircraft | The Boeing Company | 727-200F Series | Airworthiness Directives; BOEING Model 727, 737-100, -200, and -200C Series Airplanes |
| aircraft | The Boeing Company | 727 Series | Airworthiness Directives; BOEING Model 727, 737-100, -200, and -200C Series Airplanes |
| aircraft | The Boeing Company | 727C Series | Airworthiness Directives; BOEING Model 727, 737-100, -200, and -200C Series Airplanes |
| aircraft | The Boeing Company | 737-100 Series | Airworthiness Directives; BOEING Model 727, 737-100, -200, and -200C Series Airplanes |
| aircraft | The Boeing Company | 737-200 Series | Airworthiness Directives; BOEING Model 727, 737-100, -200, and -200C Series Airplanes |
| aircraft | The Boeing Company | 737-200C Series | Airworthiness Directives; BOEING Model 727, 737-100, -200, and -200C Series Airplanes |
Unsafe Condition
Engine separation due to installation of non-FAA-approved engine mount cone bolt nuts that do not conform to the approved type design.
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Required Actions
Revise the FAA-approved maintenance program to specify only FAA-approved engine mount cone bolt nuts as per the provided table. Conduct an inspection within 60 days after revising the program to verify nut conformity and authenticity, replacing non-compliant nuts before further flight. Submit a report of findings within 10 days after inspection.
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Compliance Time
Within the next 5 days after the effective date for program revision; within 60 days after program revision for inspection; within 10 days after inspection for reporting.
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Affected Aircraft
Boeing Model 727 and Model 737-100, -200, and -200C 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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