B737 has 3, including the standby. The big problem can be when a situation like this presents itself, identifying the side giving the incorrect information. Nonetheless, there is a memory checklist for ‘Airspeed Unreliable’.
The scenario has been trained in recurrent sim sessions since the year dot, but has been at the forefront since the Air France prang a few years back.
Any pilot worth his salt will know the attitude/thrust settings for various flight regimes, as this is the key to beginning the troubleshooting process.
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