Bombardier CL600-2B16 Challenger 604, VP-BJM, 11 November 2005

From:
Air Accidents Investigation Branch
Published
10 December 2014
Category:
Commercial - fixed wing
Report type:
Special bulletin
Date of occurrence:
11 November 2005
Aircraft type:
Bombardier CL600-2B16 Challenger 604
Location:
8 nm west of Midhurst VOR
Registration:
VP-BJM

Bombardier CL600-2B16 Challenger 604, VP-BJM

Summary:

At FL400 the crew experienced cautions and malfunctions concerning the stabiliser trim system. Nose-up trim commands resulted in almost full nose-down trim and the crew diverted to London Heathrow for a successful flapless landing. Later examination showed contamination within the Horizontal Stabiliser Trim Control Unit (HSTCU) where the two channels of trim command are physically close, with no mechanical back-up. There appear to have been previous occurrences with a different HSTCU on this aircraft. An AAIB Safety Recommendation is made to Transport Canada relating to the effect of the contamination on the pitch trim system.

Download report:

S3-2005 VP-BJM.pdf (249.09 kb)

Published 10 December 2014