AD 72-04-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | BOEING Model 747-100 and 747-200B Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | BOEING Model 747-100 and 747-200B Series Airplanes |
Unsafe Condition
Unscheduled stabilizer trim and loss of stabilizer control capability due to defective stabilizer trim modules (Boeing P/N 60B80027-2 and 60B80027-3) and stabilizer trim drive motors (P/N 60B00250-1).
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Required Actions
Test stabilizer trim system components within 100 hours time in service after effective date, and every 100 hours thereafter. Replace or modify defective components per Boeing Service Bulletin 27-2054. Replace trim modules with improved seals and retainer caps, and trim motors with solid locking pins. Update AFM with emergency procedures within 100 hours.
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Compliance Time
Within 100 hours time in service after effective date of this AD, and thereafter at intervals not to exceed 100 hours time in service from the last inspection.
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Affected Aircraft
Boeing Model 747-100 and 747-200B Series airplanes with stabilizer trim modules P/N 60B80027-2/-3 and/or stabilizer trim drive motors P/N 60B00250-1.
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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