F-16I

F-16 Fighting Falcon
A USAF F-16C over Iraq in 2008
Role	Multirole fighter aircraft
National origin	United States
Manufacturer	General Dynamics Lockheed Martin
First flight	20 January 1974
Introduction	17 August 1978
Status	In service, in production
Primary users	United States Air Force 25 other users (see operators page)
Number built	4,500+
Unit cost	F-16A/B: US$14.6 million (1998 dollars) F-16C/D: US$18.8 million (1998 dollars)
Variants	General Dynamics F-16 VISTA
Developed into	Vought Model 1600 General Dynamics F-16XL Mitsubishi F-2

A large number of variants of the General Dynamics F-16 Fighting Falcon have been produced by General Dynamics, Lockheed Martin, and various licensed manufacturers. The details of the F-16 variants, along with major modification programs and derivative designs significantly influenced by the F-16, are described below.

Two single-seat YF-16 prototypes were built for the Light Weight Fighter (LWF) competition. The first YF-16 was rolled out at Fort Worth on 13 December 1973 and accidentally accomplished its first flight on 21 January 1974, followed by its scheduled "first flight" on 2 February 1974. The second prototype first flew on 9 March 1974. Both YF-16 prototypes participated in the flyoff against the Northrop YF-17 prototypes, with the F-16 winning the Air Combat Fighter (ACF) competition, as the LWF program had been renamed.

In January 1975, the Air Force ordered eight full-scale development (FSD) F-16s – six single-seat F-16A and a pair of two-seat F-16B – for test and evaluation. The first FSD F-16A flew on 8 December 1976 and the first FSD F-16B on 8 August 1977. Over the years, these aircraft have been used as test demonstrators for a variety of research, development and modification study programs.

The F-16A (single seat) and F-16B (two seat) were initially equipped with the Westinghouse AN/APG-66 pulse-doppler radar, Pratt & Whitney F100-PW-200 turbofan, rated at 14,670 lb_f (64.9 kN) and 23,830 lb_f (106.0 kN) with afterburner. The USAF bought 375 F-16As and 125 F-16Bs, with delivery completed in March 1985.

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 nose cone painted black.

It was discovered that the Block 1 aircraft's black nose cone became an obvious visual identification cue at long range, so the color of the nose cone was changed to the low-visibility grey for Block 5 aircraft. During the operation of F-16 Block 1, it was discovered that rain water 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.