B737-700
Flight Crew Last 90 Days 193
Confusion; Distraction; Troubleshooting; Human-Machine Interface
Aircraft Equipment Problem Less Severe; Deviation - Speed All Types; Inflight Event / Encounter Weather / Turbulence
Aircraft Equipment Problem Dissipated; Flight Crew Took Evasive Action; Flight Crew FLC complied w / Automation / Advisory; General Maintenance Action
Aircraft; Weather
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.
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.