Which of the following instruments is NOT displayed on the ERJ's primary flight display (PFD)?

The primary flight display (PFD) of the ERJ provides pilots with crucial flight information in a consolidated format to ensure effective decision-making and situational awareness during flight. Among the instruments typically shown on the PFD are elements such as vertical speed, airspeed, and altitude, which are essential for monitoring the aircraft's performance and trajectory.

Vertical speed indicates the rate of ascent or descent in feet per minute, aiding pilots in maintaining desired climb or descent profiles. Airspeed is critical for ensuring the aircraft remains within operational limits during various phases of flight, while altitude provides essential information for maintaining separation from terrain and other aircraft.

In contrast, engine temperature, while important for engine performance monitoring, is not displayed on the primary flight display. Instead, engine-related parameters, including temperature, are typically shown on secondary displays or engine indication and crew alerting systems (EICAS) where pilots can monitor engine performance during flight without cluttering the primary display.

Thus, the correct answer identifies engine temperature as the instrument that is not included on the ERJ's PFD, underscoring the focus of the PFD on flight-critical information rather than specific engine parameters.