AD 74-14-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 250-C20 | DETROIT DIESEL ALLISON Model 250-C20 Engines |
Unsafe Condition
After fires resulting from incomplete fuel cut-off at engine shutdown.
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Required Actions
Inspect the fuel control rigging to ensure the fuel control quadrant reads minus 2 degrees with the throttle lever against the minimum stop when the twist grip is in the 'Fuel Off' position. Adjust the minimum stop screw and set to -2 degrees or 0 degrees if linkage limitations prevent. Perform adjustments on the cut-off lever link, torque nuts, apply red Glyptol, and test for fuel leakage and rigging repeatability on engines with specified fuel control part numbers.
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Compliance Time
within the next 25 hours' flight time
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Affected Aircraft
Detroit Diesel Allison Model 250-C20 Engines equipped with Chandler Evans Fuel Controls, specifically those with fuel control part numbers 6875653, 6876967, 6876797, 6877542, 6851386, and 6851506.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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