AD 77-10-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sabreliner Corporation | NA-265-80 | Airworthiness Directives; ROCKWELL INTERNATIONAL Model NA-265-80 Airplanes |
Unsafe Condition
Failure of the Instrument Inverter power input cable or thermal degradation of Relay K1066 (Cutler-Hammer P/N 6141H126) could result in loss of electrical protection and inadequate thermal isolation, leading to potential system failure.
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Required Actions
Accomplish modification specified in Rockwell International Sabreliner Service Bulletin No. 28, dated April 8, 1977, or later FAA approved revisions. Equivalent procedures may be approved by the Chief, Aircraft Engineering Division, FAA Western Region, upon submission of adequate substantiation data. Special flight permits may be issued under FAR's 21.197 and 21.199 to operate to a base for modification.
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Compliance Time
on or before June 7, 1977, unless already accomplished
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Affected Aircraft
ROCKWELL INTERNATIONAL Model NA-265-80 airplanes with serial numbers 380-1 through 380-4, 380-6 through 380-9, 380-11 through 380-13, 380-15, 380-17, 380-19, 380-21, 380-23, 380-25, 380-27, 380-30, 380-32, 380-34, 380-36 and 380-38 through 380-54, equipped with Relay K1066 (Cutler-Hammer P/N 6141H126)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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