One of the large indicators on the center console between your legs is the altitude indicator or altimeter. Before take off and landing the pilot sets the actual air pressure with the knob on the altimeter. This sets the indicated height to (barometric) ground level. Although the altimeter is a fairly large indicator, it is actually a backup instrument for the indicated height in the HUD (Head up Display). The nice thing about this indicator is that it is electrically driven, but also operates on the air pressure.

The servo-pneumatic altimeter is a dual mode pressure altitude indicator with a range of -1000 to +80,000 feet. The operating mode is manually selected by the lever located at the lower right corner of the instrument. In the ELECT (primary) operating mode, the altimeter is electrically driven by the CADC. In the PNEU (secondary) operating mode the altimeter is pneumatically operated by static pressure supplied by the pitot-static system. Should the CADC or altimeter servo malfunction.The altimeter automatically reverts to the pneumatic mode and the PNEU flag appears on the face of the altimeter. The PNEU flag may also appear when accelerating or decelerating through the transonic region or while performing high g maneuvers. The barometric setting knob, located at the lower left corner of the instrument, is used to set the desired altimeter setting. The barometric setting of the altimeter is electrically transmitted to the CADC as a manual input correction for the pressure altitude display on the HUD. The barometric setting is shown in millibars. The barometric setting is shown in inches of mercury.