AD 71-03-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-200 | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300 Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 720 Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 720B Series | BOEING Model 707 and 720 Series Airplanes |
Unsafe Condition
Corrosion and cracks in the elevator aft control quadrant hub aft flange face and central web area, and excessive ovalness of the quadrant torque tube diameter could lead to quadrant failure.
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Required Actions
Perform close visual inspections for corrosion and cracks within the next 15 hours' time in service. Conduct micrometer checks for torque tube ovalness within 750 hours' time in service. Overhaul or replace the quadrant assembly by 12,000 hours' time in service. Replace quadrant if cracks or excessive ovalness are found before further flight.
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Compliance Time
Within the next 15 hours' time in service for initial inspections; subsequent actions at intervals not exceeding 750 or 1500 hours' time in service as specified; overhaul or replace by 12,000 hours' time in service.
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Affected Aircraft
Boeing Model 707 and 720 series airplanes listed in Boeing Service Bulletin 3003, Revision 2, dated January 15, 1971, or later FAA approved revisions.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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