These airfields were intended for use by returning bombers suffering from low fuel and/or suspected damage to their pneumatic (wheel brake) and/or hydraulic (undercarriage) systems. All three airfields were equipped with one runway,  long and  wide. There was a further clear area of  at each end of the runway.
The purpose of these airfields was to provide safe landing and repair facilities for returning bombers that had experienced issues with their pneumatic (wheel brake) and/or hydraulic (undercarriage) systems. The runways were designed to accommodate long-range aircraft, and there were designated clear zones at each end for efficient maneuvering.