AD 70-22-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Wood Electric | Circuit Breakers | Airworthiness Directives; WOOD ELECTRIC: Applies to Aircraft Incorporating Wood Electric Corp Model 105, 106, 107, 108, 147, 152, 254, 447, 448, or 2100 Series Circuit Breakers |
Unsafe Condition
Jammed circuit breakers may fail to open or close properly, leading to potential electrical system malfunctions or failures.
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Required Actions
Within 500 hours' time in service after the effective date, manually open and close all specified circuit breakers to detect jams. Replace any jammed circuit breakers before further flight. Within 1250 hours' time in service, install a ring per Wood Electric Corp. Drawing 64-008 to prevent jamming. Subsequent checks every 750 hours' time in service unless modified.
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Compliance Time
Within the next 500 hours' time in service after the effective date of this AD, unless already accomplished within the last 250 hours' time in service, and thereafter at intervals not to exceed 750 hours' time in service from the last check for the manual check. The modification must be accomplished within the next 1250 hours' time in service after the effective date.
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Affected Aircraft
Wood Electric Corp. Models 105, 106, 107, 108, 147, 152, 254, 447, 448, or 2100 series circuit breakers installed in aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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