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EMB145 flight crew experiences failure of the first officer's airspeed indicator in icing conditions at FL360. A descent is requested with the first officer's airspeed indicator dropping to 80 KTS; with the captain's and standby indicating 260 KTS at FL300. The first officer's airspeed returns to normal upon exiting icing conditions.
| Attributes | |
| ACN | 1162300 |
| Time | |
| Date | 201404 |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 145 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Component | |
| Aircraft Component | Pitot-Static System |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence |
Narrative:
Level at FL360; extensive ice was building up on the windscreen; extensive ice on first officer's tat probe. Airspeed began to bleed off slowly; added more thrust; then a slow steady lateral or rolling oscillation began with the autopilot on; possibly from ice forming on some flight controls; accompanied by the number 2 pack closing. Disconnected the autopilot; and reported the condition to ATC and then declared an emergency with a request to a lower altitude and heading north out of the weather. In the descent first officer's airspeed indicator behaved like an altimeter and decreased to an airspeed of approximately 85 to 90 KTS while the captain and standby indicated 260 KTS. Called the flight attendant and told her of the situation and had her check for extensive ice on the wings. She said there was none. After descending to FL300 and approximately 15 minutes had passed; the first officer's airspeed came back and synchronized with the captain's and standby airspeed indicators. All aircraft indications and flight characteristics returned to normal. [We] notified dispatch to recalculate fuel for possible alternate landing airport. Possible severe icing.
Original NASA ASRS Text
Title: EMB145 flight crew experiences failure of the First Officer's airspeed indicator in icing conditions at FL360. A descent is requested with the First Officer's airspeed indicator dropping to 80 KTS; with the Captain's and standby indicating 260 KTS at FL300. The First Officer's airspeed returns to normal upon exiting icing conditions.
Narrative: Level at FL360; extensive ice was building up on the windscreen; extensive ice on First Officer's TAT probe. Airspeed began to bleed off slowly; added more thrust; then a slow steady lateral or rolling oscillation began with the autopilot on; possibly from ice forming on some flight controls; accompanied by the Number 2 pack closing. Disconnected the autopilot; and reported the condition to ATC and then declared an emergency with a request to a lower altitude and heading north out of the weather. In the descent First Officer's airspeed indicator behaved like an altimeter and decreased to an airspeed of approximately 85 to 90 KTS while the Captain and standby indicated 260 KTS. Called the Flight Attendant and told her of the situation and had her check for extensive ice on the wings. She said there was none. After descending to FL300 and approximately 15 minutes had passed; the First Officer's airspeed came back and synchronized with the Captain's and standby airspeed indicators. All aircraft indications and flight characteristics returned to normal. [We] notified Dispatch to recalculate fuel for possible alternate landing airport. Possible severe icing.
Data retrieved from NASA's ASRS site 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.