H-1 Ground Support Heater By Note: This item is currently in storage. Ground support heaters are used to pre-heat the cabins and engines of aircraft during cold weather. This portable heater, manufactured by the American Air Filter Co., was used by ground crews of the 89th Military Airlift Wing at Andrews Air Force Base, Md., in support of various aircraft, including VC-140Bs. The 89th restored the heater and then donated it to the museum in July 1987. Click here to return to the Featured Accessions index.