B737-700
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 134
Troubleshooting
Aircraft Equipment Problem Less Severe
Flight Crew Overcame Equipment Problem
Aircraft; Weather
The Captain's airspeed indicator malfunctioned enroute. It cycled from low to high a few times over the course of one to two minutes. When it went low; we received 'Airspeed Low'. Crew accomplished the Airspeed Unreliable procedure (indicator recovered before we finished the QRH). ATC was advised; Dispatch and MX were advised; and MX writeup was accomplished.The weather at the departure airport was very moist (foggy; humid; 21.2/21.2 temp/dew point split). The aircraft was covered in clingy water droplets (as you may expect for such a day). May have been an internal frozen moisture issue at altitude.
A B-737 flight crew experienced a periodically malfunctioning Captain's airspeed indicator. It failed a few times but returned to normal operation before the QRH procedure could be finished. They noted that the weather at the departure airport was very moist; foggy; and humid.