AD 89-04-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | CL-44D4 | Airworthiness Directives; CANADAIR Model CL-44D4 and CL-44J Series Airplanes |
| aircraft | Bombardier Inc. | CL-44J | Airworthiness Directives; CANADAIR Model CL-44D4 and CL-44J Series Airplanes |
Unsafe Condition
Wing failure due to exfoliation corrosion on the wing upper skin.
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Required Actions
Perform a visual inspection of the upper wing skin area between the front and rear spars over the total wing span for corrosion, including raised blistering or bulging, in accordance with Canadair Alert Wire 44T-1340/2431. If corrosion exceeds 20 sq.in. in any one skin panel, conduct a non-destructive testing inspection and repair prior to further flight. If corrosion is 20 sq.in. or less, repair within 900 hours time-in-service or 6 months. Submit inspection results to Canadair.
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Compliance Time
Within 225 hours time-in-service or 30 days after the effective date of this AD, whichever occurs first, and thereafter at intervals not to exceed 12 months.
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Affected Aircraft
Bombardier Inc. Model CL-44D4 and CL-44J series airplanes, certificated in any category.
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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