AD 61-21-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | CL-44D4 | Airworthiness Directives; CANADAIR Model CL-44D4 Aircraft |
Unsafe Condition
Failure of the tail pipe door structure due to fatigue cracking in the attachment holes of specific tail pipe compartment access panels.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect tail pipe compartment access panels with specified part numbers for fatigue cracking using dye penetrant or equivalent. Replace, repair, or reinforce cracked panels per Canadair Service Bulletin CL-44D4-138 or approved modification. Continue inspections at intervals not exceeding 35 hours' time in service if interim repairs are made. Discontinue inspections after approved modification.
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Compliance Time
Within the next 25 hours' time in service unless already accomplished within the last 10 hours' time in service and at intervals not to exceed 35 hours' time in service.
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Affected Aircraft
Bombardier Inc. Model CL-44D4 Aircraft, Serial Numbers 14, 16, 19 through 23, 25 and 26.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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