Engine Fuel & Control — High Pressure / Low Pressure Fuel Pump Metering Unit — Inspection / Replacement
- Published
- Effective
- Deadline
- Replaces
- 2017-0102R1
- Replaces
- 2010-0215R1
- Replaces
- 2009-0184
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must inspect the torque between the LP pump impeller and HP pump shaft within specified compliance times based on engine group classification. If discrepancies are found, the HP/LP pump metering unit must be replaced with a post-mod TU 178 unit before next flight. Engines not previously modified must be updated within 2,200 engine flight hours or 138 months after 27 June 2017. Installation of pre-mod TU 178 units is prohibited on modified engines from specified dates.
Summary
EASA Airworthiness Directive 2017-0102R2 is an updated regulatory requirement addressing inspection and replacement of the high pressure/low pressure fuel pump metering unit on SAFRAN Helicopter Engines ARRIEL 2 series engines. These engines are commonly installed on Airbus Helicopters AS 350 B3, EC 130 B4, and Changhe Z11 helicopters. The directive mandates inspections and modifications to prevent uncoupling of the LP fuel pump impeller and HP fuel pump shaft, which can lead to engine power loss or in-flight shutdown.
What changed
This revision extends the compliance time for modification of the HP/LP pump metering unit to post-mod TU 178 configuration and amends the compliance time for parts installation requirements. It updates previous requirements to reflect new service experience and incorporates SAFRAN MSB 292 73 2178 Version D for modification instructions. The directive supersedes earlier ADs including 2010-0215R1 and retains inspection and replacement mandates with updated timelines.
Why it matters
This directive is critical for aviation professionals to ensure continued airworthiness and safe operation of helicopters powered by ARRIEL 2 engines. Failure to comply may result in engine power loss or uncommanded shutdown, posing safety risks especially for single-engine helicopters. Operators and maintenance organizations must adhere to inspection and modification requirements to mitigate these risks and maintain regulatory compliance.
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New ADs and bulletins for Safran ARRIEL 2, Airbus Helicopters AS 350 B3, Airbus Helicopters EC 130 B4 and Changhe Z11, summarized like this page, every Monday.