Which item is NOT listed as a standard electrical accessory for the airplane?

• A. Radar altimeter
• B. Starter
• C. Electric fuel pump
• D. Annunciator panel

Answer: (A)

Understanding what counts as a standard electrical accessory on an airplane helps here. The electrical system typically powers devices that are basic operating aids or status indicators: the starter uses electrical power to crank the engine, the electric fuel pump provides fuel pressure as part of normal operation, and the annunciator panel groups warning and status lights tied to the electrical system. A radar altimeter, by contrast, is a specialized avionics instrument that uses radar to measure height above the ground and is usually considered part of the aircraft’s avionics suite rather than a standard electrical accessory. Because it’s not a basic electrical component required for starting or general operation, it’s not listed as a standard electrical accessory in many references. It may be installed as optional equipment on some aircraft, depending on configuration.