lbs) and a specific fuel consumption of 0.57 lb/h/lb. This powerplant facilitates a maximum speed of 414 knots at 25,000 ft and a rate of climb of 5,100 ft per minute. Fuel is housed internally within both the integral wing tank and a bladder cell within the fuselage, accommodating a combined 955 L (210 U.S. gal); for greater range, a maximum of two drop tanks can be installed upon the inner hard points of the wing, each having a capacity of 323 L (71 U.S. gal). Fuel is transferred between the various tanks and to the engine via a double-ended turbine pump. Ground refuelling involves a single fill point present on the wing, which is fed either by gravity flow or by an optionally installed pressurised refuelling system. Operational history Since the 1990s, the Philippine Air Force (PAF) has been using its S-211 fleet both as a trainer and in offensive operations via secondary attack capability. These were redesignated as AS-211s and nicknamed as "Warriors". Following the retirement of the PAF's last Northrop F-5 fighters in 2005, the additional task of air defense has also been assigned to its AS-211s. Because of this, the PAF initiated some improvements to the AS-211s to improve its combat capability through a series of programs and innovations. The first program was called "Project Falcon", which installed the Norsight Optical Sight previously fitted to withdrawn F-5s into the AS-211. The program was initiated by Lieutenant Colonel Enrique Dela Cruz, the Group Commander of the 5th Tactical Fighter Group. This was followed by the "Project Falcon Uniform" program, which repainted the aircraft with a 2-tone light-and-dark ghost gray paint scheme along with low visibility markings, which reduces the aircraft's overall visibility. The "Project Falcon Hear" program involved the optimizing of air-ground communications on the AS-211 by upgrading and installing the AN/ARC-34 UHF radios from the F-5A/B. These aircraft were also fitted with a belly-mounted gun pod, which was designed, developed and manufactured by Philippine company Aerotech Industries Philippines, Inc. (AIPI). Each gun pod is equipped with an M3 .50 cal machine gun, an automatic charger and approximately 240 rounds of .50 cal ammunition. Variants S-211 Original production version with total of approximately sixty built and was operated by the air forces of Haiti, Philippines and Singapore. S-211A Proposed version developed with input from Grumman for the JPATS (two prototypes, converted from two former Haitian S-211 aircraft).