AD 78-20-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aircraft Parts & Development Corp. | A-9 | Airworthiness Directives; Aircraft Parts and Development Corporation Models A-9, A-9A, and A-9B Airplanes |
| aircraft | Aircraft Parts & Development Corp. | A-9A | Airworthiness Directives; Aircraft Parts and Development Corporation Models A-9, A-9A, and A-9B Airplanes |
| aircraft | Aircraft Parts & Development Corp. | A-9B | Airworthiness Directives; Aircraft Parts and Development Corporation Models A-9, A-9A, and A-9B Airplanes |
Unsafe Condition
Failure of the main carry-through tube, P/N 11013, due to corrosion from exposure to corrosive chemicals in airplanes equipped with the large hopper.
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Required Actions
Inspect the fiberglass wrapping for cracks, remove corrosion exceeding 0.010 inch depth or 2% cross-sectional area, replace the tube if corrosion exceeds limits, and rewrap with fiberglass laminate using specified materials. Compliance must be achieved within the next 25 hours' time in service after the effective date.
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Compliance Time
within the next 25 hours' time in service after the effective date of this AD except that aircraft added by Amendment 39-3356 must comply within the next 25 hours' time in service from the effective date of such amendment
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Affected Aircraft
Aircraft Parts & Development Corp. Models A-9, A-9A, and A-9B with wing struts carry-through tube running through the hopper, certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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