Engine Indicating - Incorrect Engine Torque Indication
- Published
- Effective
- Deadline
- Replaces
- CF-2015-01R1
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must replace the #9 and #10 position bearings on affected PT6B-37A engines either during the next engine shop visit or within 3000 hours air time or 48 months from 2 December 2016, whichever occurs later. The replacement must follow the instructions in P&WC Service Bulletin 39108 or later approved revisions. Engines with post SB 39117 configured reduction gearboxes are exempt from this AD.
Summary
Airworthiness Directive CF-2015-01R2 is issued by Transport Canada concerning Pratt & Whitney Canada PT6B-37A engines installed on AW119MKII helicopters. The directive addresses incorrect engine torque indication caused by axial migration of bearings in the engine torque sensing gear, which can lead to undetected over-torque conditions. This revision updates compliance requirements to include an operating hours limit for bearing replacement.
What changed
CF-2015-01R2 revises the previous AD CF-2015-01R1 by introducing a 3000 hours air time limit as an alternative to the existing 48 months calendar time limit for bearing replacement. It clarifies that engines with post SB 39117 configured reduction gearbox are not affected due to a new torque sensing gear design. The compliance approach shifts from calendar time to operational hours based on recent data.
Why it matters
This directive is critical for operators and maintenance organizations to prevent undetected over-torque conditions that can reduce the operational life of engine components. Ensuring timely bearing replacement maintains engine reliability and safety. Compliance teams must update maintenance schedules to reflect the new time-in-service limits to avoid regulatory violations and potential safety risks.
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