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After wing anti-ice system fails; CL65 flight crew elects to maintain high speed below 10000 feet in compliance with company flight manual to minimize ice build-up. ATC is informed and approves.
| Attributes | |
| ACN | 812735 |
| Time | |
| Date | 200811 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl bound lower : 6000 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | Mixed |
| Weather Elements | Ice Snow |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet CL65 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude ground : parked |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 100 flight time total : 2500 flight time type : 2000 |
| ASRS Report | 812735 |
| Events | |
| Anomaly | aircraft equipment problem : critical inflight encounter : weather |
| Independent Detector | aircraft equipment other aircraft equipment : master warning other flight crewa |
| Resolutory Action | other |
| Supplementary | |
| Problem Areas | Weather Aircraft |
| Primary Problem | Aircraft |
Narrative:
The anti-icing system was initiated just prior to the aircraft entering icing conditions. A master warning was received in the flight deck indicating that the wing anti-icing system; while operating in the normal mode; was not functional. The company flight manual dictates to leave icing conditions; increasing airspeed to vmo; if possible; and to operate the anti-icing system in the standby mode. While in the standby mode; the system again indicated inoperative and an immediate descent with the necessary power and speed needed for ice dispersal was initiated. While descending out of icing conditions from 14000 ft to 8000 ft; the speed was in excess of 250 KTS. ATC was advised of the situation and the airspeed and they approved us as requested. At 8000 ft and still in icing conditions; lower was requested and upon reaching 6000 ft and leaving icing conditions; the speed was immediately reduced to 250 KTS. A PIREP was given by an E145; 5 mi ahead at 8000 ft; rime icing; -22 degrees celsius.
Original NASA ASRS Text
Title: AFTER WING ANTI-ICE SYSTEM FAILS; CL65 FLIGHT CREW ELECTS TO MAINTAIN HIGH SPEED BELOW 10000 FEET IN COMPLIANCE WITH COMPANY FLIGHT MANUAL TO MINIMIZE ICE BUILD-UP. ATC IS INFORMED AND APPROVES.
Narrative: THE ANTI-ICING SYSTEM WAS INITIATED JUST PRIOR TO THE ACFT ENTERING ICING CONDITIONS. A MASTER WARNING WAS RECEIVED IN THE FLT DECK INDICATING THAT THE WING ANTI-ICING SYSTEM; WHILE OPERATING IN THE NORMAL MODE; WAS NOT FUNCTIONAL. THE COMPANY FLT MANUAL DICTATES TO LEAVE ICING CONDITIONS; INCREASING AIRSPD TO VMO; IF POSSIBLE; AND TO OPERATE THE ANTI-ICING SYSTEM IN THE STANDBY MODE. WHILE IN THE STANDBY MODE; THE SYSTEM AGAIN INDICATED INOP AND AN IMMEDIATE DSCNT WITH THE NECESSARY PWR AND SPD NEEDED FOR ICE DISPERSAL WAS INITIATED. WHILE DSNDING OUT OF ICING CONDITIONS FROM 14000 FT TO 8000 FT; THE SPD WAS IN EXCESS OF 250 KTS. ATC WAS ADVISED OF THE SITUATION AND THE AIRSPD AND THEY APPROVED US AS REQUESTED. AT 8000 FT AND STILL IN ICING CONDITIONS; LOWER WAS REQUESTED AND UPON REACHING 6000 FT AND LEAVING ICING CONDITIONS; THE SPD WAS IMMEDIATELY REDUCED TO 250 KTS. A PIREP WAS GIVEN BY AN E145; 5 MI AHEAD AT 8000 FT; RIME ICING; -22 DEGS CELSIUS.
Data retrieved from NASA's ASRS site as of May 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.