AD 73-26-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-10-10 | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, DC-10-30, and DC-10-30F Airplanes |
| aircraft | The Boeing Company | DC-10-30 | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, DC-10-30, and DC-10-30F Airplanes |
| aircraft | The Boeing Company | DC-10-30F (KC-10A, KDC-10) | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, DC-10-30, and DC-10-30F Airplanes |
Unsafe Condition
Incorrect nose cowl attach bolts (P/N 71658-6) may be installed, leading to potential failure of the engine nose cowl attachment system.
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Required Actions
Inspect and replace bolts P/N 71658-6 with P/N EWB 22-6-14 or approved equivalents. Inspect and replace cracked nutplates or those with sheared rivets. Ensure bolt protrusion and washer installation per specified tolerances. Clean and apply sealant as required, torque bolts to 28-32 foot-pounds, and verify installation before QEC unit installation.
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Compliance Time
within the next 10 hours' of flight for Model DC-10-10 airplanes and 50 hours' of flight for Model DC-10-30 and DC-10-30F airplanes after the effective date of this AD
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Affected Aircraft
McDonnell Douglas DC-10-10, DC-10-30, and DC-10-30F airplanes certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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