AD 2010-12-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. MAKILA 1A and 1A1 Turboshaft Engines |
Unsafe Condition
The installation of TU250 comparator/selector (CS) boards has resulted in erratic engine behavior, including unexpected N1 variations and/or illumination of the 'GOV' warning light, due to a lapse in quality control in the varnishing process applied to the boards. This affects only boards in a specific serial number range (241EL to 1192EL, inclusive).
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Required Actions
Replace any CS board, part number 0 177 99 716 0, with a serial number between 241EL and 1192EL (inclusive), that has fewer than 200 hours-since-new (HSN) within 50 operating hours from the effective date. Replace any CS board with the same part number and serial number range that has 200 HSN or more during the next 500-hour inspection. Use the specified paragraphs of Turbomeca S.A. Mandatory Service Bulletins for replacement.
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Compliance Time
Within 50 operating hours for boards with fewer than 200 HSN, and during the next 500-hour inspection for boards with 200 HSN or more.
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Affected Aircraft
Turbomeca S.A. MAKILA 1A and 1A1 turboshaft engines with comparator/selector (CS) board, part number 0 177 99 716 0, and serial number between 241EL and 1192EL (inclusive). These engines are installed on, but not limited to, Eurocopter AS 332 C, AS 332 C1, AS 332 L, and AS 332 L1 helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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