Southwest B737 on July 7th 2017, unreliable airspeed and altitude
Southwest B737 on Jul 7th 2017, unreliable airspeed and altitude. A Southwest Airlines Boeing 737-700, registration N929WN performing flight WN-3641 from Las Vegas,NV to Cleveland,OH (USA), was enroute at FL290 about 100nm east of Las Vegas when the crew decided to return to Las Vegas, the aircraft descended to 12,000 feet. On the way back the aircraft performed several full circles while the crew talked to dispatch and maintenance. The aircraft landed safely back on Las Vegas’ runway 07L about 65 minutes after departure.
A listener on frequency reported the crew reported they had no reliable airspeed and altitude indications. The crew talked to dispatch and maintenance to troubleshoot the problem.
A replacement Boeing 737-700 registration N420WN reached Cleveland with a delay of 5 hours.
The occurrence aircraft returned to service about 12 hours after landing.
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