CRJ- 900 flight crew reported a wing anti-ice duct malfunction while in icing conditions.
Synopsis
CRJ- 900 flight crew reported a wing anti-ice duct malfunction while in icing conditions.
Narrative
Flight from ZZZ1 to ZZZ; in ZZZ1 we got a DUCT MON FAULT status message; maintenance deferred it and the plane was dispatched into ZZZ reporting light FZRN and OVC003. At 2;200 feet on our base turn to final we received 'wing A/I (Anti-ice) duct' warning message followed by anti-ice duct caution and L and R wing anti ice caution. I was pilot flying; captain ran the QRH; and it stated we need to leave icing conditions immediately. Knowing we lost anti-ice on the wings; the METAR was reporting freezing rain and visibility was declining; we started seeing ice built up on the windshield; captain made the decision to climb higher to get out of icing conditions and to take time to complete the QRH and trouble shoot.We found a clear layer at 6;000 feet but went back into icing and needed to climb higher. At 10;000 we were still in icing conditions and because it was the end of the controllers airspace we requested priority handling to get higher to be clear of icing conditions. We safely leveled off at FL190. Captain coordinated with dispatch about an alternate and also confirmed with the flight attendants that we still had icing on the wings. Dispatch gave us ZZZ2 as an alternate considering icing conditions and fuel on board. At this point we still had around 6;000 lbs of fuel on board. We continued the flight to ZZZ2 at FL220. METAR reported OVC015 and temperature 8 degrees Celsius. We continued the approach with the configuration per the QRH since we were descending through clouds and temperatures lower than 10 degrees. Captain did the landing in ZZZ2. Safe and uneventful.Cause: Wing anti-ice system failure.Suggestions: If we were to dispatch an aircraft into known icing conditions at the destination airport; it would be better to know we do have our system redundancy in place should one system fail we still have a backup while in icing conditions.
Second reporter narrative
At approximately 2;200 feet turning base and after being cleared for the approach Anti-Ice Duct warning messaged appeared. Followed quickly by ANTI-ICE Duct Caution as well as L Wing and R wing Anti-ice caution. I tried to run the QRH but only got through the first couple of steps Anti-ice off and leave icing conditions climbing initially to 6;000 feet and on a heading. At 6;000 we were between layers so I continued the QRH cycling the wing Anti-Ice back on when we re-entered the clouds to which the same warnings then cautions appeared. I asked for higher and climbed to 10;000 feet. We were still in icing conditions there and that was the top of approach controls airspace so I requested priority handling and asked for higher. We broke out at 16k feet or so. At this point we had accumulated quite a bit of icing on the wipers. 1/4 inch if not 1/2 inch it's hard to say. At 10;000 feet the aircraft was whistling from ice accumulation and so I didn't hesitate to request priority handling. I called the Flight Attendants who reported icing on the wings. We then worked with dispatch and eventually climbed to FL220. We bounced around a while between going to ZZZ1 and ZZZ3 which was on the release. Eventually dispatch said ZZZ2 would keep me clear of icing. So we finished the QRH and headed that way. About halfway between ZZZ and ZZZ2 the iced on the wipers was gone. I went back and checked the wings and they looked clear. I elected to do the full QRH because of the Note that stated icing conditions because we were going to fly through some clouds on the way down into ZZZ2 in temps below 10 degrees Celsius. I asked for the trucks as a precaution and we made an uneventful landing in ZZZ2.Cause: Anti-Ice Failure in icing conditions.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.