AD 77-12-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-100B Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-200B Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-200C Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-200F Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-300 Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-400 Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-400D Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-400F Series | BOEING Model 747 Airplanes |
Unsafe Condition
Failure of the fuel valve actuator assembly due to an improperly heat treated armature shaft could result in loss of control of fuel shutoff, crossfeed, and required fuel management capability.
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Required Actions
Remove and replace or inspect and rework the fuel valve actuator assemblies (Boeing P/N 60B92406-27/-28 or ITT P/N MA11A1173/MA11A1174) with approved parts or methods within specified compliance times. For engine fuel shutoff valves, compliance is required within 145 days or 1300 hours time in service. For crossfeed and other valves, compliance is within 1 year or 3200 hours time in service.
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Compliance Time
Within 145 days or 1300 hours time in service after the effective date (June 20, 1977) for engine fuel shutoff valves; within 1 year or 3200 hours time in service after the effective date for crossfeed and other specified valves.
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Affected Aircraft
Boeing Model 747 airplanes equipped with fuel valve actuator assemblies (Boeing P/N 60B92406-27/-28, ITT P/N MA11A1173/MA11A1174, serial numbers as specified) installed or manufactured between April 30, 1975, and April 1, 1977.
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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