Which display element is associated with the Standby Pressure Altimeter for locating altitude across large ranges?

• A. Drum display with two movable digits indicating 100 increments to 99,000 ft
• B. A digital readout of altitude only
• C. Analog dial
• D. A single 4-digit readout of altitude

Answer: (A)

The display element used with the Standby Pressure Altimeter to locate altitude over a wide range is a drum display with two movable digits that indicate 100-foot increments up to about 99,000 feet. This design lets you read altitude quickly across a very large range while keeping the resolution practical for cockpit use. A digital readout or an analog dial wouldn’t provide the same combination of wide-range visibility and at-a-glance readability for high altitudes, and a single 4-digit readout wouldn’t cover elevations beyond 9,999 feet. The drum arrangement is robust, legible, and suited to backup instruments that must convey altitude across extensive ranges.