EASA SIB AV-2010-04: Bombardier (formerly Canadair) - Core Cowl Stay Support Strut/Rod

What to do

Affected operators and maintenance personnel should strictly follow the Aircraft Maintenance Manual Temporary Revision 71-137 procedures to verify that the primary lock and secondary lock pin of the core cowl stay support strut/rod are correctly engaged and oriented. Any defects or malfunctions must be reported to Transport Canada Continuing Airworthiness as per CAR 521 requirements. No explicit compliance deadline is stated.

Summary

Transport Canada Service Difficulty Advisory AV-2010-04 addresses a potential issue with the engine core cowl stay support strut/rod on Bombardier Regional Jet Series (CL-600-2B19) and Challenger 600 (CL-600-2A12/2B16) aircraft equipped with CF34-1 and CF34-3 engines. The advisory highlights the risk of in-flight engine shutdowns caused by incorrect stowage of the upper core cowl door stay support strut/rod, which can interfere with the throttle control mechanism.

What changed

This advisory introduces a non-mandatory notification emphasizing the importance of correctly stowing the engine core cowl stay support strut/rod to prevent interference with the throttle control linkage. It clarifies proper locking procedures and pin orientations as detailed in the Aircraft Maintenance Manual Temporary Revision 71-137 to mitigate the risk of engine control jams.

Why it matters

For aviation professionals, this advisory is critical because improper stowage of the core cowl support strut/rod can lead to engine throttle jams and potential loss of aircraft control, as demonstrated by reported incidents. Operators and maintenance teams must ensure compliance with updated maintenance procedures to maintain safe engine operation and avoid in-flight shutdowns.