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Airworthiness Directives; JET ELECTRONICS AND TECHNOLOGY, INC. All Model PS-835 Series Emergency Power Supply Installations

Unsafe Condition: A false indication that emergency power is available could occur due to the absence of a temporary placard near the test switch or unmodified J.E.T. model PS-835 series emergency power supplies.

Why matched: Airworthiness Directives; JET ELECTRONICS AND TECHNOLOGY, INC. All Model PS-835 Series Emergency Power Supply Installations

Airworthiness Directives; JET ELECTRONICS AND TECHNOLOGY, INC. Model PS-823( ) Series Emergency Power Supplies

Unsafe Condition: Loss of emergency electrical power and possible corrosive or thermal damage to the aircraft due to unmodified Model PS-823( ) series Emergency Power Supplies.

Why matched: Airworthiness Directives; JET ELECTRONICS AND TECHNOLOGY, INC. Model PS-823( ) Series Emergency Power Supplies