AD 74-10-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING Model 707 and 720 Airplanes |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING Model 707 and 720 Airplanes |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING Model 707 and 720 Airplanes |
| aircraft | The Boeing Company | 707-200 | BOEING Model 707 and 720 Airplanes |
| aircraft | The Boeing Company | 707-300 Series | BOEING Model 707 and 720 Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Model 707 and 720 Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Model 707 and 720 Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Model 707 and 720 Airplanes |
| aircraft | The Boeing Company | 720 Series | BOEING Model 707 and 720 Airplanes |
| aircraft | The Boeing Company | 720B Series | BOEING Model 707 and 720 Airplanes |
Unsafe Condition
Excessive non-recoverable internal hydraulic leakage in the auxiliary hydraulic system and possible loss of aircraft direction control at critical air speeds.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect auxiliary hydraulic system for internal leakage per Boeing Alert Service Bulletin 3154 or equivalent method. Replace or rework components if leakage is 1.0 GPM or greater. For leakage ≥3.0 GPM, replace or overhaul components before further flight. Adjust inspection intervals with FAA approval.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within specified intervals (300 or 600 hours time in service after effective date, then every 2,000 hours time in service).
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Affected Aircraft
Boeing Model 707 and 720 airplanes with 6,000 hours or more time in service.
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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