AD Amdt-39-9851
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | de Havilland | DHC-7 | Airworthiness Directives; de Havilland Model DHC-7 Series Airplanes |
Unsafe Condition
Corrosion forming on areas of the airplane structure where black film thermal insulation blankets are used could result in degradation of the structural capability of the airplane fuselage and consequent sudden loss of cabin pressure.
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Required Actions
Review airplane maintenance records to determine if insulation blankets were repaired or changed. If repaired/changed, perform a visual inspection for black film insulation. Depending on findings, remove black film insulation, inspect for corrosion, repair corroded structure with FAA-approved method, and install new silver blankets. Prohibit installation of black Orcon film insulation.
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Compliance Time
Within six months after the effective date (February 3, 1997) for the initial record review. Subsequent actions must be completed before further flight.
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Affected Aircraft
All de Havilland Model DHC-7 series airplanes, regardless of modifications, alterations, or repairs.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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