AD 90-12-04 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 757-200 Series | Airworthiness Directives; BOEING Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-200CB Series | Airworthiness Directives; BOEING Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-200PF Series | Airworthiness Directives; BOEING Model 757 Series Airplanes |
| aircraft | The Boeing Company | 757-300 Series | Airworthiness Directives; BOEING Model 757 Series Airplanes |
Unsafe Condition
Undetected failure of the anti-ice system could result in unacceptable ice build-up on the wings or engine inlets.
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Required Actions
Perform functional tests of the wing and engine cowl anti-ice control and indication system within specified time-in-service intervals and modify/test the system according to Boeing Alert Service Bulletin 757-30A0013 revisions. Compliance may be adjusted with FAA approval.
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Compliance Time
Within the next 300 hours time-in-service after specific dates (e.g., February 4, 1988; July 9, 1990; or the AD's effective date October 13, 1993) for tests, and within 3,000 hours time-in-service after specific dates for modifications.
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Affected Aircraft
Boeing Model 757 series airplanes listed in Boeing Alert Service Bulletin 757-30A0013, Revision 6, dated March 25, 1993, 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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