AD 82-21-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Jet Electronics Technology, Inc. | Emergency Power Supply | 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.
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Required Actions
Within 25 hours time-in-service after the effective date, check for a panel located battery test switch and install a temporary placard if present. By October 1, 1983, examine records and modify the power supply per SB501-1228-7 if it is an unmodified PS-835A, B, C, or D model. The modification must be done by an FAA-certificated repair station for flight instrument power supplies.
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Compliance Time
Within the next 25 hours time-in-service after the effective date of this AD and on or before October 1, 1983
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Affected Aircraft
Jet Electronics and Technology, Inc. Model PS-835 series Emergency Power Supply installations
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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