Sky-High Success: Ace the FAA AMT Airframe Practice Exam 2026 – Soar to New Heights!

Vane type pump is the source of pressure for inflating deicer boots on reciprocating engine aircraft. This option is correct because the vane type pump is responsible for creating and regulating the air pressure that inflates the deicer boots and removes any accumulated ice.

Option A, heat control relay, is incorrect because it controls the temperature inside the aircraft, not the inflation of the deicer boots. Option B, ammeter, is also incorrect as it measures the electrical current in the system, but does not provide pressure for inflation. Option D, distributor valve, is responsible for evenly distributing the air pressure to the different deice boots, but not for creating or regulating the pressure.

Therefore, out of the options provided, only vane type pump is the most accurate source of pressure for inflating deicer boots on reciprocating engine aircraft.