Beechcraft King Air Series Main Gear Jack Pad* Product may vary from picture. The 30M B90 Main Gear Jack Pad will save time and money when needing to raise one main gear wheel for a tire change, repacking wheel bearings or servicing the brakes. When used with a long stroke jack, the jack pad may be used to change a flat tire. Small and light enough to carry on board, the jack pad adds mission capability when operating from airports that do not have full service or wing jacks large enough to lift