AD 62-21-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | CL-44D4 | Airworthiness Directives; CANADAIR Model CL-44D4 Aircraft |
Unsafe Condition
Bearing failure resulting from sludge deposited in oil ways which feed the high pressure turbine bearing.
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Required Actions
Install high pressure turbine bearing scavenge oil temperature indicating system per Rolls Royce Modification 959 and Canadair Service Information Circular No. 216-CL44D4. Check oil flow through the scavenge line if not done within 100 hours prior, following Rolls Royce Alert Service Bulletin A-Ty79-15. Update airplane flight manual with provisions from Section 2D of Service Bulletin A-Ty79-15 regarding engine feathering if oil temperature exceeds 180°C during cruise.
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Compliance Time
within the next 350 hours' time in service after the effective date of this AD
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Affected Aircraft
CANADAIR Model CL-44D4 aircraft equipped with Rolls Royce Tyne Engines.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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