AD 94-01-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 767-200 Series | Airworthiness Directives; BOEING Model 767 Series Airplanes |
| aircraft | The Boeing Company | 767-300 Series | Airworthiness Directives; BOEING Model 767 Series Airplanes |
| aircraft | The Boeing Company | 767-300F Series | Airworthiness Directives; BOEING Model 767 Series Airplanes |
Unsafe Condition
The inability to maintain hydraulic system power in the event that power is lost in both engines due to potential failure of the ram air turbine (RAT) airspeed switch and wire between the RAT airspeed switch and the air/ground relay.
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Required Actions
Replace the ram air turbine (RAT) airspeed switch, cap and stow the wire between the RAT airspeed switch and the air/ground relay, and perform a functional test of the RAT deployment system in accordance with Boeing Service Bulletin 767-29-0021, Revision 4.
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Compliance Time
Within 4,000 hours time-in-service or 15 months after the effective date of this AD, whichever occurs later
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Affected Aircraft
Boeing Model 767 series airplanes as listed in Boeing Service Bulletin 767-29-0021, Revision 4, dated May 12, 1988
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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