AD 64-01-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | CL-44D4 | Airworthiness Directives; CANADAIR Model CL-44D4 Series Aircraft |
Unsafe Condition
Seizure of sealed couplings P/N 44A53940 in unpressurized areas leading to loss of rudder control.
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Required Actions
Inspect for brown staining between coupling housing and fork, rotate and axially shift rotating parts to check for binding/seizure. Replace coupling if binding/seizure is found before further flight. Lubricate couplings per maintenance manual.
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Compliance Time
Within 25 hours' time in service after the effective date (January 4, 1964), unless already accomplished within the last 25/225 hours' time in service, and thereafter within 50/250 hours' time in service from the last inspection.
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Affected Aircraft
Bombardier Inc. Model CL-44D4 Series aircraft with sealed couplings P/N 44A53940 not modified per Canadair Service Bulletin CL44D4-304.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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