How many pitot-static instruments are installed on the Boeing 737?

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Multiple Choice

How many pitot-static instruments are installed on the Boeing 737?

Explanation:
Redundancy in the air data system is the key idea. The Boeing 737 is equipped with three pitot probes so that airspeed data stays available even if one probe becomes blocked or fails. Two probes provide the normal data to the primary air data system and instruments, while the third serves as a standby/backup source (or cross-check) for the standby instruments. This setup helps ensure safe, continuous airspeed information during flight, which is why there are three pitot probes.

Redundancy in the air data system is the key idea. The Boeing 737 is equipped with three pitot probes so that airspeed data stays available even if one probe becomes blocked or fails. Two probes provide the normal data to the primary air data system and instruments, while the third serves as a standby/backup source (or cross-check) for the standby instruments. This setup helps ensure safe, continuous airspeed information during flight, which is why there are three pitot probes.

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