AD 74-20-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Leigh Systems | Emergency Locator Transmitter | Airworthiness Directives; LEIGH SYSTEMS: Emergency Locator Transmitter Leigh Systems Sharc 7 Series |
Unsafe Condition
Chemical corrosion may cause failure of the Emergency Locator Transmitter (ELT) to operate or result in inadvertent activation, jamming the emergency frequencies of 121.5 MHz and 243.0 MHz.
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Required Actions
Conduct a visual inspection for corrosion per Leigh Systems' Service Bulletin No. 003A or approved equivalent. If no corrosion is found, verify ELT transmission compliance. If corrosion exists or transmission fails, replace with an approved serviceable unit or TSO-approved unit before next flight except for ferry flights under FAR 91.52(e)(2).
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Compliance Time
Within the next 90 days and thereafter at each additional 60 day interval after the effective date of this Airworthiness Directive.
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Affected Aircraft
Leigh Systems Emergency Locator Transmitter Sharc 7 Series, serial numbers all through 163500 equipped with lithium batteries.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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