AD 75-12-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sabreliner Corporation | NA-265-40 | Airworthiness Directives; ROCKWELL INTERNATIONAL Model NA 265-40 and NA 265-60 Airplanes |
| aircraft | Sabreliner Corporation | NA-265-60 | Airworthiness Directives; ROCKWELL INTERNATIONAL Model NA 265-40 and NA 265-60 Airplanes |
Unsafe Condition
Failure of engine supports due to cracks in the engine support beam outer skins.
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Required Actions
Perform a close visual inspection of the R.H. and L.H. engine support beam outer skin within 10 hours' time in service after receipt of the airmail letter. If cracks are found, install a doubler type repair for special flight permit or replace the entire outer skin prior to further flight. Additionally, inspect the outer skin by eddy current method within 50 hours' time in service for hardness per Service Bulletin 75-16. If defective, repair and ferry flight to a base for skin replacement or inspect for cracks every 100 hours until replacement, which must be done within 650 hours' time in service.
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Compliance Time
Within the next 10 hours' time in service after receipt of this airmail letter (for initial visual inspection), within the next 50 hours' time in service (for eddy current inspection), and replacement of defective skin no later than 650 hours' time in service after receipt.
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Affected Aircraft
Sabreliner Corporation Model NA 265-40 airplanes, serial numbers 282-112, -113, -115 through -137, and model NA 265-60 airplanes, serial numbers 306-64 through -102.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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