AD 90-17-08
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
Failure of the wing and engine anti-ice system thermal anti-ice operational test could result in inadequate ice protection leading to reduced aircraft performance or control difficulties.
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Required Actions
Within 300 hours time-in-service after July 21, 1988, and every 300 hours thereafter, perform the wing and engine thermal anti-ice operational test per Boeing Service Bulletin 767-30A0011, Rev 2. Correct any switch or circuit malfunction identified during testing prior to further flight. Within 6,000 hours time-in-service after this AD's effective date, modify the thermal anti-ice system per the same service bulletin.
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Compliance Time
Within the next 300 hours time-in-service after July 21, 1988, and thereafter at intervals not to exceed 300 hours time-in-service for the operational test. The system modification must be done within 6,000 hours time-in-service after the effective date of this AD.
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Affected Aircraft
BOEING Model 767-200 Series, 767-300 Series, 767-300F Series airplanes listed in Boeing Service Bulletin 767-30A0011, Rev 2.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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