What type of power does the starter cart assembly (SCA) provide to the MA-1 and MQ-9 aircraft?

The starter cart assembly (SCA) is designed to provide the necessary power for starting aircraft engines. In the case of the MA-1 and MQ-9 aircraft, the power provided by the SCA is 28 VDC (volts direct current). This specific voltage is critical as it aligns with the power requirements of the onboard systems, ensuring that the electrical components can function effectively during the starting process.

Using 28 VDC is common in military aviation because it helps deliver sufficient power to start turbine engines while maintaining compatibility with other integrated aircraft systems. This voltage allows for efficient operation without the complications that accompany alternating current (AC) systems.

The alternatives, such as 120 VAC or lower DC voltages, do not meet the specifications and operational needs for aircraft ignition systems, which require a robust and stable DC power source for reliable performance during engine start sequences.