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Tue, May 07, 2019

AD: Bombardier, Inc., Airplanes

AD NUMBER: 2019-03-29

PRODUCT: Certain Bombardier, Inc., Model BD-100-1A10 (Challenger 300) airplanes.

ACTION: Final Rule.

SUMMARY: This AD was prompted by an incident of uncommanded nose wheel steering (NWS) in-service; subsequent investigation revealed that the steering selector valve (SSV) is susceptible to jamming in the open position due to particulate contamination of the hydraulic system.

This AD requires modifying the left-hand hydraulic system of the NWS control system and, for certain airplanes, torquing the fittings on a certain tube assembly.

DATES: This AD is effective June 6, 2019.

COST: The FAA estimates that this AD affects 534 airplanes of U.S. registry. Operators may incur the following costs in order to comply with this AD:
Labor: 25 work-hours × $85 per hour = $2,125. Parts: $13,196. Cost per airplane: $15,321

FMI: AD

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