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A B737-700 captain's airspeed tape and airspeed information failed in flight accompanied by the low airspeed aural warning and airspeed unreliable message. About two minutes after the anomaly began the airspeed returned so ice crystals were suspected.
| Attributes | |
| ACN | 1271123 |
| Time | |
| Date | 201506 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pitot-Static System |
| Person 1 | |
| Function | Captain |
| Experience | Flight Crew Last 90 Days 193 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Speed All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
Loss of captain's airspeed tape and all airspeed information. Low airspeed aural alert and airspeed unreliable message. All first officer instruments normal. First officer maintained aircraft control. QRH run. Talked about possible ice crystal encounter. Airspeed information cycle and few times from low to high to low; then returned to normal about two minutes later. Flight continued. Dispatch; maintenance; and ATC notified.
Original NASA ASRS Text
Title: A B737-700 Captain's airspeed tape and airspeed information failed in flight accompanied by the LOW AIRSPEED aural warning and AIRSPEED UNRELIABLE message. About two minutes after the anomaly began the airspeed returned so ice crystals were suspected.
Narrative: Loss of Captain's Airspeed tape and all airspeed information. Low Airspeed aural alert and Airspeed Unreliable message. All FO instruments normal. FO maintained aircraft control. QRH run. Talked about possible ice crystal encounter. Airspeed information cycle and few times from low to high to low; then returned to normal about two minutes later. Flight continued. Dispatch; Maintenance; and ATC notified.
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.