EASA SIB 2010-01R1
Failure of compressor adapter couplings in Rolls-Royce Corporation (RRC) Model 250-C20, -C20B, -C20F, -C20J, -C20S, -C20W and —B17 series turboprop and turboshaft engines
Summary
EASA Safety Information Bulletin (SIB) No. 2010-01R1 addresses the failure of compressor adapter couplings in Rolls-Royce Corporation Model 250-C20, -C20B, -C20F, -C20J, -C20S, -C20W, and -B17 series turboprop and turboshaft engines. These engines are installed on various helicopters including Agusta A109 series, Bell 206 series, Enstrom 480 series, Eurocopter AS355 and BO-105 series, MD Helicopters 369 series, Schweizer 269D, and fixed-wing aircraft such as the Britten-Norman BN-2T. The bulletin highlights safety concerns following multiple failures and related FAA Airworthiness Directive 2004-26-09.
What Changed
This revision of SIB 2010-01 inserts a fourth reminder in the recommendation section and adds two helicopter models to the list of affected aircraft. It also updates information following recent failure events, including one involving the improved replacement compressor adapter coupling, which led to an accident and is under investigation by the Swedish Accident Investigation Board.
Why It Matters
The bulletin raises awareness of a critical safety issue that can cause engine shutdown due to compressor adapter coupling failure. Aviation professionals, including operators and maintenance organizations, must ensure compliance with FAA AD 2004-26-09 to prevent premature wear and failure of these parts. Proper replacement and adherence to maintenance instructions are essential to maintain engine reliability and flight safety.
What To Do
Operators should replace all compressor adapter couplings with core part number 23039791 with the improved part number 23076559 as mandated by FAA AD 2004-26-09. Replacement must follow the instructions in the AD and Rolls-Royce Corporation Alert Commercial Engine Bulletins CEB-A-1392 or TP CEB-A-1334. No coupling should be reused once the compressor assembly is split, regardless of part number. There is no new mandatory compliance deadline beyond the existing AD requirements.
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