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CRJ-200 NWS Problem  
User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2153 posts, RR: 9
Posted (9 years 4 weeks 22 hours ago) and read 5591 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?

[Edited 2007-04-08 02:07:59]

10 replies: All unread, jump to last
User currently offlineHAWK21M From India, joined Jan 2001, 31875 posts, RR: 54
Reply 1, posted (9 years 4 weeks 19 hours ago) and read 5563 times:

Tire Pressure.
Oleo Extensions.
What does the Isolation manual state.

Think of the brighter side!
User currently offlineRadialman From Canada, joined Aug 2001, 33 posts, RR: 0
Reply 2, posted (9 years 4 weeks 18 hours ago) and read 5549 times:

Is there any difference with the steering switched off while doing a taxi test.
What are the codes from the ECU.- AMM Task 32-50-00-740-801 and AMM Task 32-51-10-700-801.

User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2153 posts, RR: 9
Reply 3, posted (9 years 3 weeks 6 days 21 hours ago) and read 5486 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. Wink

User currently offlineArrow From Canada, joined Jun 2002, 2676 posts, RR: 2
Reply 4, posted (9 years 3 weeks 6 days 4 hours ago) and read 5360 times:

Check the political credentials of your pilots. Are they all Republicans?  Smile

Never let the facts get in the way of a good story.
User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2153 posts, RR: 9
Reply 5, posted (9 years 3 weeks 6 days 3 hours ago) and read 5353 times:

LOL...Good in theory, but I drove it around the airport myself, and it pulled me to the right too Wink

User currently offlineRJwrench85 From , joined Dec 1969, posts, RR:
Reply 6, posted (9 years 3 weeks 4 days 17 hours ago) and read 5256 times:

Did you guys run through SL RJ-SL-32-039
ATA: 3250
DATE: 25 Aug 03
SUBJECT: Lateral Deviation Customer Questionnaire
MODEL: CL-600-2B19
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
ground maneuvers.

Edited to correct SL #

[Edited 2007-04-11 06:15:54]

User currently offlineAogdesk From United States of America, joined Jun 2004, 936 posts, RR: 3
Reply 7, posted (9 years 3 weeks 4 days 7 hours ago) and read 5229 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".

User currently offlineMiamiair From , joined Dec 1969, posts, RR:
Reply 8, posted (9 years 3 weeks 4 days 6 hours ago) and read 5221 times:

What about the trunnion/attach point being off the centerline?

Doesn't take much, but then again I am familiar with Boeing/MD products.

User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2153 posts, RR: 9
Reply 9, posted (9 years 3 weeks 4 days ago) and read 5187 times:

Well, the verdict is in. They changed the NWS harness a second time with a GOOD part from stock, and she finally flew the coup. Good bye and good riddance:P

User currently offlineCF188A From , joined Dec 1969, posts, RR:
Reply 10, posted (9 years 3 weeks 3 days 19 hours ago) and read 5168 times:

pray to God that the wind shifts  Wink

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