AD 77-17-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | CL-44D4 | Airworthiness Directives; CANADAIR MODELS CL-44D4 and CL-44J Airplanes |
| aircraft | Bombardier Inc. | CL-44J | Airworthiness Directives; CANADAIR MODELS CL-44D4 and CL-44J Airplanes |
Unsafe Condition
Failure of the nose landing gear upper radius rods due to cracks.
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Required Actions
Inspect Items 1, 2, and 3 using dye penetrant, eddy current, or ultrasonic methods per Canadair Service Information Circular No. 151-CL44, Issue 3. Replace cracked parts with new or approved equivalents, or rework them per the same circular. Repeat inspections at intervals not exceeding specified landing counts. Replace reworked parts after 3000 landings or upon crack recurrence.
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Compliance Time
Within the next 75 landings for parts with 1175+ landings by August 18, 1977; before attaining 1250 landings for others. Repeat inspections at intervals not exceeding 60, 200, or 30 landings depending on part and rework status.
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Affected Aircraft
Bombardier Inc. CL-44D4 and CL-44J airplanes not altered per Canadair Service Information Circular No. 151-CL44, Issue 3 or FAA-approved equivalent.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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