UAL Bagsmasher From United States of America, joined Sep 1999, 2148 posts, RR: 9 Posted (8 years 2 weeks 6 days 8 hours ago) and read 4544 times:
Ok all you CRJ-200 mechs, time to pick your brains. We have a CRJ-200 that pulls to the right when taxiing. No steering inop EICAS messages have ever been shown. Nothing is flagged in the ECU. The RVDT's are in rig. The aircraft has been jacked and the brakes aren't dragging. The Steering manifold and EHSV have been R&R'd with no luck. The R/H RVDT has been R&R'd with no luck. A new ECU has been slaved in with no luck. A new Tiller has been slaved in with no luck. Both engines have been tested for Accel/Decel rates and have passed. The NWS harness has been ohmed out and Megged, both while being shaken, and it has passed. Both NLG tires have been R&R'd with no luck. As of right now, the SSV is being changed, followed by both actuators. What the heck else is left in the system that would cause the aircraft to veer to the right(only) while taxiing? The drift is not violent, but it is noticeable and unacceptable. Every other time I've seen this problem, it ended up being an EHSV or RVDT at fault. We're sick of looking at this lawn ornament. Maybe it's time to call our friends over the border for an action plan...Any ideas?
UAL Bagsmasher From United States of America, joined Sep 1999, 2148 posts, RR: 9
Reply 3, posted (8 years 2 weeks 5 days 8 hours ago) and read 4439 times:
Update. The SSV was changed last night and was a no fix. First thing this morning we consulted Bombardier and requested an Action Plan. They recommended changing the NWS harness, as they have seen this exact symptom before as a result of a faulty harness (even though it had ohmed and megged good). So we change the harness. Next thing you know, the LFT RVDT won't hold a steady rigging. As we examined the LFT RVDT, we wiggled the braided cable hooked to it. The torque links start moving on their own. Bad from stock NWS harness. What a waste of time changing that was. So, another day later, she still sits. Gotta love it. I'm glad I'm off the next few days. Hopefully it will be gone by the time I get back to work.
RJwrench85 From , joined Dec 1969, posts, RR:
Reply 6, posted (8 years 2 weeks 3 days 4 hours ago) and read 4209 times:
Did you guys run through SL RJ-SL-32-039
DATE: 25 Aug 03
SUBJECT: Lateral Deviation Customer Questionnaire
APPLICABILITY: ALL CRJ100/200/440
In order to gather data to address the concerns raised in references with the above subject
Bombardier Aerospace In-Service Engineering needs more specific information from the
operators experiencing occurrences related to erratic directional control experienced during
Aogdesk From United States of America, joined Jun 2004, 935 posts, RR: 3
Reply 7, posted (8 years 2 weeks 2 days 18 hours ago) and read 4182 times:
Bagsmasher, do you know how many days or hours were spent doing all the troubleshooting before Bombardier suggested focusing on that wiring harness? I can't believe how far some issues go before someone pops up and says "Oh, we've seen that exact problem before".