COLD WAR F-16 VARIANTS
Early blocks (Block 1/5/10) featured relatively minor differences between each. Most were later upgraded to the Block 10 configuration in the early 1980s. There were 94 Block 1, 197 Block 5, and 312 Block 10 aircraft produced. Block 1 is the early production model with the radome painted black.
It was discovered that the Block 1 aircraft’s black radome became an obvious visual identification cue at long range, so the color of the radome was changed to the low-visibility grey for Block 5 aircraft. During the operation of F-16 Block 1, it was discovered that rainwater could accumulate in certain spots within the fuselage, so drainage holes were drilled in the forward fuselage and tail fin area for Block 5 aircraft.The Soviet Union significantly reduced the export of titanium during the late 1970s, so the manufacturers of the F-16 used aluminum instead wherever practical. New methods were also used: the corrugated aluminum is bolted to the epoxy surface for Block 10 aircraft, replacing the old method of aluminum honeycomb being glued to the epoxy surface used in earlier aircraft.
The breakdown is as follows: 90 F-16A Block 1, 4 F-16B Block 1, 100 F-16A Block 5, 97 F-16B Block 5, 300 F-16A Block 10, and 12 F-16B Block 10. It is unclear how many of each type were produced, but these figures are generally reasonable. As mentioned above, 375 A-types and 125 B-types were delivered to the U.S. Air Force, and the remaining aircraft were exported.
The first major change in the F-16, the Block 15 aircraft featured larger horizontal stabilators, the addition of two hardpoints to the inlet chin, an improved AN/APG-66(V)2 radar,an extra aerial refueling light located on the vertical stabilizer, and increased capacity for the underwing hardpoints. The Block 15 also gained the Have Quick II secure UHF radio. To counter the additional weight of the new hardpoints, the horizontal stabilizers were enlarged by 30%. Furthermore, the lower UHF/IFF antenna, the lower threat warning antenna, the total air temperature probe and two ambient air sense ports, originally located on the inlet chin, were relocated due to the placement of the new hardpoints.The Block 15 is the most numerous variant of the F-16, with 983 produced. Nine hundred F-16A Block 15s and eighty-three F-16B Block 15s were produced and rolled out, the last of which was delivered to the Royal Thai Air Force in 1996.
In October 1986, the USAF announced that operational block 15 F-16A/B aircraft would be converted to air defense fighters for the Air National Guard, and would take over the fighter interception mission, providing the primary defense of North America against bombers and cruise missiles.The first F-16A ADF conversion was completed in February 1989, while a contract was placed for kits to update and modify a total of 270 F-16A/B’s at the Ogden Air Logistics Center in Utah. The Block 15 airframes used for the ADF program were all meant to be upgraded to block 15OCU standard, and both programs ran in conjunction. Aircraft entering the Ogden ALC for ADF upgrade also received the Block 15OCU avionics installation. The net result is that all ADF aircraft are Block 15OCU airframes. The last ADF left Ogden in 1992.
Production of the F-16C/D began with Block 25 (also known as MSIP Stage II). The first F-16C (serial number 83-1118) flew on June 19, 1984 and was delivered to the USAF one month later. The new variant was introduced on the production line in December. Flight testing of the new F-16C revealed problems, most of which were associated with software difficulties. Development lead times which were once paced by hardware problems were now becoming paced by software bugs, and there was a shortage of people which understood both computers and airplanes.Following initial deliveries to overseas units, the 312st TFTS stationed at Luke AFB in Arizona became the first continental US unit to receive the F-16C/D, getting its first planes in April of 1986 and becoming fully operational in October of 1988.
The Block 25 F-16C/D aircraft were originally all powered by the Pratt & Whitney F100-PW-200 turbofan, but they have since been upgraded to the -220E standard.
This was the first block of F-16s affected by the Alternative Fighter Engine project under which aircraft were fitted with the traditional Pratt & Whitney engines or, for the first time, the General Electric F110-GE-100. From this point on, blocks ending in "0" (e.g., Block 30) are powered by GE, and blocks ending in "2" (e.g., Block 32) are fitted with Pratt & Whitney engines. The first Block 30 F-16 entered service in 1987. Major differences include the carriage of the AGM-45 Shrike, AGM-88 HARM, and the AIM-120 missiles, which entered service in September 1991. From Block 30D, aircraft were fitted with larger engine air intakes (called a Modular Common Inlet Duct) for the increased-thrust GE engine. Since the Block 32 retained the Pratt and Whitney F100 engine, the smaller (normal shock inlet) was retained for those aircraft. 200 F-16C Block 30, 200 F-16D Block 30, 100 F-16C Block 32, and 133 F-16D Block 32 were built. Of these, only the early Block 30s were exported to six countries.
The next major production block (Block 40/42), sometimes known as the "Night Falcon" because of its enhanced night/all-weather capabilities, appeared in 1989. It was unofficially designated F-16CG/DG when the USAF wanted to call the LANTIRN capable Viper an F-16G, but Congress wouldn’t approve a "new" aircraft, which was politically seen as a threat to the F-22.Block 40/42 (also part of MSIP III) introduced the LANTIRN navigation and targeting pods and the associated holographic HUD, the GPS (Global Positioning System) navigation receiver, APG-68V(5) radar (with a 100+ hour Mean Time Between Failures or MTBF) and ALE-47 decoy launchers, digital flight controls (replacing the old analog ones), automatic terrain following, and a diffractive optics heads-up display. Also included were a new positive-pressure breathing system to improve G-tolerance for the pilot, full provisions for internal electronic countermeasures, an enhanced envelope gun sight, and a capability for bombing moving ground targets.
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