AD Amdt-39-11470
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | DHC-7 | Airworthiness Directives; Bombardier Model DHC-7 Series Airplanes |
Unsafe Condition
Corrosion in the upper halves of the left and right hand lower longerons on the inboard nacelles, which could result in a landing gear failure.
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Required Actions
Perform a visual inspection to detect corrosion on the upper half of the lower longerons on the inboard nacelles. If no corrosion is detected, modify the upper and lower longeron halves. If corrosion is detected, take corrective actions as specified in Bombardier Service Bulletin S.B. 7-54-19, Revision `C,' dated April 16, 1999, including inspections for cracks and, if necessary, replacing or repairing the longerons.
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Compliance Time
Within 6 months after the effective date of this AD.
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Affected Aircraft
Bombardier Model DHC-7 series airplanes, serial numbers 004 through 113 inclusive, except serial numbers 037 and 061, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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