AD 2020-22-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Polskie Zaklady Lotnicze Sp. z o.o Airplanes |
Unsafe Condition
During maintenance on an M28 05 military version airplane, torn pieces of thermo-shrinkable tubes were found in the header section of the main fuel tank. These tubes are installed on electrical harnesses located in the fuel tanks and serve as marking and protection devices against mechanical damage during manufacturing and servicing. Pieces of these tubes may travel with the fuel flow and may block the jet pump or reduce its performance, particularly in the centre-wing fuel tank, in which the jet pump is the only way of further transfer of fuel to the engine.
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Required Actions
Inspect the electrical harnesses located in the fuel tanks for damage and, depending on findings, replace any electrical harness with damaged thermo-shrinkable tubes.
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Compliance Time
Before further flight
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Affected Aircraft
Polskie Zaklady Lotnicze Sp. z o.o. Model PZL M28 05 airplanes, serial numbers AJE00301 through AJE00343, and AJE00345 through AJE00347.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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