AD 94-10-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | Airworthiness Directives; Boeing Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | Airworthiness Directives; Boeing Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | Airworthiness Directives; Boeing Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; Boeing Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; Boeing Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | Airworthiness Directives; Boeing Model 747-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | Airworthiness Directives; Boeing Model 747-100, -200, and -300 Series Airplanes |
Unsafe Condition
Deployment of the engine fan thrust reverser during flight due to plugging of the DCV vent path, deploy signal line, or gear switcher actuator deploy chamber port, which can cause the gear switching actuator to move to the 'deploy' position and result in thrust reverser deployment when the thrust lever is moved to the 'idle' position.
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Required Actions
Modify the thrust reverser control system by installing a solenoid-operated shut-off valve in accordance with Boeing Service Bulletin 747-78-2052, Revision 4, dated March 23, 1989. Ensure compliance with the service bulletin's effective pages. Prohibit installation of JT9D engines without the modification as of 18 months after the AD's effective date.
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Compliance Time
Within 36 months after the effective date of this AD (June 20, 1994), and as of 18 months after the effective date for engine installations.
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Affected Aircraft
Boeing Model 747-100, -200, and -300 series airplanes equipped with Pratt & Whitney JT9D series engines, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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