AD 90-20-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-10-40 | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-40 Series Airplanes |
| aircraft | The Boeing Company | DC-10-40F | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-40 Series Airplanes |
Unsafe Condition
Loss of structural integrity of the Rohr Common Nacelle System (CNS) forward engine mount cross beam due to cracks or insufficient hardness below C40 on the Rockwell hardness scale.
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Required Actions
Inspect and rework the CNS forward engine mount cross beam (Rohr part numbers 196-0328-1 or 196-0328-501) per Rohr Alert Service Bulletin MDC-CNS A71-33, Revision 1. Replace with part number 196-1300-501 before 35,000 cycles or immediately if cracks/hardness below C40. Replace part number 196-1300-501 before 46,667 cycles.
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Compliance Time
Prior to the accumulation of 10,000 cycles or within 1,500 cycles after October 22, 1990, whichever occurs later. Repetitive inspections every 3,000 cycles. Replacement of part 196-1300-501 before 46,667 cycles.
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Affected Aircraft
MCDONNELL DOUGLAS DC-10-40 series airplanes equipped with engines installed per Rohr STC SA3139WE.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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