AD 2006-11-16
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming | Former Military T53-L-11B | Airworthiness Directives; Honeywell International Inc. T5311A, T5311B, T5313B, T5317A, T5317A-1, and T5317B Series Turboshaft Engines and Lycoming Former Military T53-L-11B, T53-L-11D, T53-L-13B, T53-L-13B/D, and T53-L-703 Series Turboshaft Engines |
| engine | Honeywell | International Inc | Airworthiness Directives; Honeywell International Inc. T5311A, T5311B, T5313B, T5317A, T5317A-1, and T5317B Series Turboshaft Engines and Lycoming Former Military T53-L-11B, T53-L-11D, T53-L-13B, T53-L-13B/D, and T53-L-703 Series Turboshaft Engines |
Unsafe Condition
Loss of fuel flow from the engine fuel control regulator assembly due to failure of both main and secondary drive shaft and pump gear splines.
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Required Actions
Remove the fuel control regulator assembly from the engine and perform an initial visual and dimensional inspection of the fuel control regulator assembly main and secondary drive shaft and pump gear splines for wear. Use specified service bulletin instructions for the inspection. Do not install any engine fuel control regulator assembly that fails inspection. Perform repetitive visual and dimensional inspections of the fuel control regulator assembly main and secondary drive shaft and pump gear splines for wear every 1,250 flight hours since-last-inspection.
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Compliance Time
Within 150 flight hours after the effective date of this AD for the initial inspection. Repetitive inspections are due every 1,250 flight hours since-last-inspection.
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Affected Aircraft
Honeywell International Inc. T5311A, T5311B, T5313B, T5317A, T5317A-1, and T5317B series turboshaft engines and Lycoming former military T53-L-11B, T53-L-11D, T53-L-13B, T53-L-13B/D, and T53-L-703 series turboshaft engines using Goodrich Pump & Engine Control Systems, Inc. engine fuel control regulator assembly models TA-2S, TA-2G, TA-2F, TA-7, or TA-10.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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