The ailerons also are powered by dual-hydraulic systems. They have balance tabs on the outboard and control tabs on the inboard, which assures adequate maneuverability in the event of a total hydraulic failure. The flight spoiler systems assist ailerons and also function as speed brakes. Nose wheel steering is hydraulically powered and controlled by a steering wheel to approximately 78 degrees in either direction. Fuel is contained in three main tanks inside the wing center section.
Rapid pressure fueling and defueling is accomplished at the fueling station on the right wing.
The avionics package includes one UHF and two VHF radio altimeters, variable instrument switching and two Collins FD-108 flight directors. A third vertical gyro and an additional VHF transceiver are available in case of failure of the primary systems. The C-22B was introduced by the airline industry in 1963. Currently, there are three C-22B's in use, all assigned to the 201st Airlift Squadron, District of Columbia Air National Guard. Spare parts are increasingly costly and difficult to obtain as commercial operators phase out this series of Boeing 727 and supply sources dwindle.