AD 70-18-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pilatus Aircraft Limited | PC-6/B1-H2 | Airworthiness Directives; Pilatus Model PC-6/B1-H2 Airplanes |
Unsafe Condition
Inadvertent propeller feathering and potential malfunction of antireversing switches (P/N 973.10.11.101) due to insufficient maintenance procedures and inadequate emergency procedures in the Airplane Flight Manual.
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Required Actions
Revise the Airplane Flight Manual per Pilatus Service Bulletin No. 100. Inspect and replace antireversing switches (P/N 973.10.11.101) based on time-in-service thresholds: switches with 975+ hours must be replaced within 25 hours; those with <975 hours require functional tests within 25 hours. Replace switches that malfunction immediately. Subsequent replacements must occur every 2,000 hours. Readjust systems per the service bulletin.
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Compliance Time
Within the next 25 hours' time in service after the effective date (August 31, 1970), and subsequent intervals as specified (e.g., 2,000 hours' time in service from last replacement).
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Affected Aircraft
Pilatus Aircraft Limited Model PC-6/B1-H2 airplanes with serial numbers up to and including 711; 2001, 2004 through 2010, and 2040.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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