Engine Fuel & Control - Engine Collective Position Transducer - Inspection
- Published
- Effective
- Deadline
- Replaces
- 2018-10-07
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Sikorsky S-76C helicopters with the specified CPT part numbers must perform initial and recurring inspections of the CPT by measuring resistance, linearity resistance movement, and differential voltage. If inspections indicate failure, the CPT must be replaced. Compliance with this AD is mandatory by November 8, 2019, and operators should use the latest Sikorsky Maintenance Manual revisions for guidance.
Summary
Airworthiness Directive 2019-19-12 is a final rule issued by the FAA addressing Sikorsky Aircraft Corporation Model S-76C helicopters equipped with Turbomeca Arriel 2S1 or 2S2 engines that have engine collective position transducers (CPT) part numbers 76900-01821-104 or 76900-01821-105 installed. This directive mandates inspections and potential replacement of the CPT to prevent failure that could lead to engine control issues. It updates and expands upon the previous AD 2018-10-07 by including an additional CPT part number.
What changed
This AD supersedes AD 2018-10-07 by retaining the original inspection requirements and expanding the applicability to include an additional CPT part number 76900-01821-105. It also allows the use of updated Sikorsky Maintenance Manual Temporary Revision 73-10 for corrective actions, providing updated procedures and graphics. The directive incorporates new service information and clarifies inspection and replacement protocols.
Why it matters
This directive is critical for aviation professionals as it addresses an unsafe condition related to wear in the engine collective position transducer that has caused One Engine Inoperative incidents. Compliance ensures continued airworthiness and safety of affected Sikorsky S-76C helicopters, helping operators and maintenance teams prevent potential engine control failures. It also provides updated maintenance procedures that improve inspection accuracy and reliability.
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