Warning Systems - Altitude Alert

Altitude alerting occurs when approaching or departing the MCP-selected altitude. Total absence of altitude alerting indicates system failure.

Approaching Selected Altitude

At 900 feet prior to reaching the selected altitude, the ALT light on each pilot's altimeter illuminates. At 300 feet prior to reaching the selected altitude, the ALT lights extinguish.

At 750 feet prior to reaching the selected altitude, the ALT light on each pilot's altimeter illuminates. At 300 feet prior to reaching the selected altitude, the ALT lights extinguish.

Deviating From a Selected Altitude

ALT ALERT

When deviating by 300 feet from the selected altitude:

When deviating more than 900 feet from the selected altitude, or upon returning to within 300 feet of the selected altitude:

  • The master CAUTION lights extinguish.
  • The EICAS caution message is no longer displayed.
  • The ALT ALERT light extinguishes.

Altitude alerting is reset when:

Altitude Alert Inhibits

Altitude alerting is inhibited in flight with the Landing Gear Down and Locked.

GPWS