AD 76-07-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bendix | Ignition Switches | Airworthiness Directives; BENDIX IGNITION SWITCHES: Applies To All Aircraft Employing Magnetos and Using Bendix Ignition Switches |
Unsafe Condition
Bendix ignition switches may malfunction, allowing the engine to continue running when the switch is in the extreme 'OFF' direction, which could result in unintended engine operation during ground operations or flight.
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Required Actions
Conduct checks every 100 hours' time in service: perform a normal magneto check during ground run-up, rotate the switch to the extreme 'OFF' position while engine is idling, and if the engine continues running (indicating a malfunction), repair or replace the switch per Bendix Service Bulletin 583 or an approved method before next flight. Pilots may perform these checks.
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Compliance Time
within the next 100 hours' time in service and each 100 hours thereafter
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Affected Aircraft
All aircraft employing magnetos and using Bendix ignition switches listed in the table (excluding switches with four-digit date code or white dot on support plate)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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