AD 85-21-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-300 Series | BOEING Model 737-300 Series Airplanes |
Unsafe Condition
Loose cone bolts and interference between the engine and engine support strut at the forward engine mount could result in engine separation or structural failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect clearances between the engine and support strut as specified in Boeing Telegraphic Service Letter M-7272-2396. If clearance is insufficient, lower the engine and inspect cone bolts and receptacles for pitting, galling, wear, or clearances. Penetrant-inspect cone bolt threads, repair or replace damaged components, eliminate interference, and reinstall engine with cone bolts tightened to 1200-1400 inch-pounds torque.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 30 days after the effective date of this AD
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Affected Aircraft
Boeing Model 737-300 series airplanes delivered prior to line position 1147 (delivered before September 13, 1985)
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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