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F-16

F-16 Fighting Falcon Variants

Introduction

This article will provide a quick overview of each of the F-16 Fighting Falcon versions and what is visibly different about them.

In the Beginning...

YF-16

There were two aircraft produced for the fly-off with the YF-17. These were 72-1567 and 72-1568 and were recognizable by their distinctive red/white/blue paint schemes, followed later by interesting camouflage patterns that were never adopted.

F-16 FSD

Eight Full-Scale-Development (FSD) aircraft came next which were used for flight test. These were 75-0745/52. Once the basic flight test objectives were achieved and the F-16 entered production, six of these eight aircraft went on to some other interesting duties:

  • 75-0745 – first to fly with the General Electric F101 engine. The F101 powers the B-1, and the F101 DFE (Derivative Fighter Engine) would become the F110 that would power many of the F-16C/D, all of the F-14B/D, and even some F-15s.
  • 75-0747 – transformed into the two-seat F-16XL with cranked arrow wing, tentatively designated F-16F, entered NASA’s test fleet as aircraft 848.
  • 75-0749 – transformed into the single-seat F-16XL with cranked arrow wing, tentatively designated F-16E, entered NASA’s test fleet as aircraft 849.
  • 75-0750 – this aircraft was the AFTI testbed and flew extensively in a variety of configurations including with a pair of canards under the engine intake for advanced maneuverability testing.
  • 75-0751/52 – flew with the General Electric J79 engine installed to develop an export version of the aircraft when it had been determined that the F100 engine was too advanced to be exported.

F-16A/B Introduction

F-16AThe APG-66 radar of the F-16A/B was optimized for the intercept and dogfight role. The only air-to-air missile capability was the AIM-9 Sidewinder in addition to the M61 Vulcan cannon. The canopies of production F-16A/B aircraft were clear, though with the introduction of the gold-tinted canopies with the F-16C/D (designed to reduce the aircraft’s radar cross-section), the tinted canopies quickly found their way into the F-16A/B fleet.

You’ll see many photos of F-16A/Bs with tinted canopies and clear rear canopies as the fixed rear sections were not changed out as quickly. Ironically, these aircraft (along with most of total F-16 fleet) are being switched back to clear canopies to make the aircraft night vision goggle (NVG) compatible. Landing lights were mounted on the main landing gear on most versions of the F-16A/B until they were relocated to the nosegear door on MLU and Block 20 Vipers.

F-16A/B Block 1/5/10

These initial aircraft were externally identical as the production improvements were mostly internal. Powered initially by the F100-PW-100, these were later changed out for the F100-PW-200 in an attempt to mitigate the stagnation stall problems being experienced by the Pratt-powered F-15 and F-16.

F-16A/B Block 15

F-16A MLU

This was the first major visible upgrade to the aircraft with the main difference being the horizontal stabilizers. The area of the horizontal stabs was increased by 30% and this revised stab would remain with the all subsequent Vipers. Later model Block 15s designated Block 15 OCU (Operational Capability Upgrade) received the more reliable F100-PW-220 engine, AMRAAM capabilities, Maverick missile capabilities, and provisions for the ALQ-131 ECM pod.

F-16A/B MLU

The Mid-Life Update (MLU) program was designed to extend the physical and operational lives of the NATO F-16s. These updates include an upgraded F100 engine, updated avionics, a Block 50-styled glass cockpit, new HUD, relocated landing lights to the nosegear door, IFF ‘bird cutter’ antennas ahead of the canopy, AIM-120 capability, and FLIR-pod capability under the starboard side of the intake.

F-16A/B Block 20

These are new-build F-16A/Bs that were built to Block 15 OCU and MLU standards.

F-16A ADF

F-16A ADF

These were production Block 15 aircraft that were modified for the air defense interceptor role. The modifications included IFF ‘bird cutter’ antennas ahead of the windscreen and under the intake ahead of the nosegear, a redesigned vertical stabilizer base with bulges on the sides to accommodate relocated hydraulics, a modified radar to give the F-16 its first radar-guided missile capability– the AIM-7F Sparrow, and a spotlight built into the left side of the aircraft’s nose for night intercepts. An F-16B ADF was also developed, but its external appearance was identical to standard F-16Bs.

F-16C/D Introduction

Engine problems with the F100 persisted, so the decision was made to dual-power the F-16. The concept was simple – design the airframe and the engines to be swappable, allowing for the F100-PW-220 to be swapped with the F110-GE-100 (F101DFE) as required. This would prevent the grounding of the entire F-16 fleet as previous problems with F100 had caused. In reality, the modular approach wasn’t practical as the increased airflow requirements of the GE engine required a larger inlet. As a result, aircraft were designed off the production line to be or Pratt-powered, though in theory they could be reconfigured at depot should the need ever arise.

The F-16C/D also introduced the gold-tinted canopies. These were designed to reduce the radar cross-section of the F-16, especially head-on. The concept was with a smaller signature, an enemy radar wouldn’t detect the F-16 until it was much closer, and in a head-on intercept, this was critical. In the early days of the F-16C/D, these canopies were in high demand to retrofit the F-16A/B fleet, but today, many of the F-16C/Ds are trading their gold-tinted canopies for clear to operate better with NVGs.

The F-16C/D received a new radar, the AN/APG-68. This provided better air-to-air, air-to-ground, and general navigation capabilities. The flightpath displays in the Heads-Up Display (HUD) were revolutionary.

F-16C/D Block 25

Despite some ongoing teething problems with the F100, the first F-16C/Ds (Block 25) were still exclusively Pratt-powered.

F-16C/D Block 30/32

F-16C Block 30 This was the first of the dual-powered series aircraft. The Block 30/32 were supposed to be capable of swapping Pratt and engines, but experience with the F110-GE-100 showed the need for a larger inlet. In the early days of operations, Block 30 and 32 aircraft looked identical except for the engine nozzles. The Block 30 was GE-powered, the Block 32 was Pratt-powered. While many of the Block 30s received larger inlets later in life, there were still Block 30s flying with the smaller Normal Shock Inlet (NSI), so check the nozzle (or the aircraft serial number) to see if that is really a Block 30 or 25/32.

Block 30 was the transitional airframe with the engine and while initial deliveries of the type came with the same small-mouthed NSI intake as the Pratt-powered aircraft, later airframes received the large-mouth inlet (also referred to as the MCID or Modular Common Intake Duct). Some of the earlier airframes were retro-fitted with the MCID intake, but there are still F-16C Block 30s flying today with the NSI intake.

Initially, the Block 25 and early Block 32 were identical in appearance, so only a check of the aircraft serial numbers would tell the difference. The Block 30/32D introduced the radar warning receiver (RWR) antennas on the leading edge flaps. These were not on the initial production Block 30/32 aircraft but were later retro-fitted.

Block 30/32 Vipers more recently started carrying the Litening or Sniper FLIR pods on the starboard side of the intake. These new-generation pods have higher resolution and better higher altitude performance than the older LANTIRN pods on the Block 40/42.

F-16CG/DG Block 40/42

F-16C Block 40This was the second mission specialist version of the F-16 (the ADF being the first). The F-16CG/DG was optimized for night operations against ground targets while retaining its ability to defend itself against air threats. This aircraft was designed to carry the LANTIRN suite, a pair of pods that provided radar and FLIR capabilities that also equipped the F-15E Strike Eagle. The F-16CG/DG was already in service when Operation Desert Shield started, but supplies of the LANTIRN were still limited. Nevertheless, LANTIRN-equipped Vipers demonstrated their precision prowess on the battlefield. The radar pod is mounted under the left side the engine intake while the FLIR pod is under the right side. While you’ll see F-16CG/DGs flying without pods, they’ll generally operate with just the FLIR pod installed.

In addition to LANTIRN, other external differences of the F-16CG/DG include the unique holographic HUD and the relocated landing lights on the nose gear door. The landing lights were originally on the main gear, but the LANTIRN pods blocked the lights from shining ahead of the aircraft.

Like the Block 30, the Block 40 aircraft are powered by the F110-GE-100 and all have the wide-mouth intake, while the Block 42 is powered by the F100-PW-220 (just as were the Block 25/32) and retains the original small-mouth intake.

Another significant difference between this block and previous F-16s is the landing gear. Block 40/42 had an increase in payload and take-off weight thanks to heavier duty landing gear that was an outcome of the Israeli experience with the aircraft. To accommodate the larger main wheels, the main gear doors have distinctive bulges in them. These landing gear and gear door enhancements were also applied to Block 50/52/60/62 Vipers as well.

F-16CJ/DJ Block 50/52

F-16C Block 50

As the F-4G Wild Weasel neared the end of its service life, the USAF implemented the concept of pairing ‘manned pylons’ (F-16Cs with HARM missiles) with the sensors of the F-4G as a hunter/killer team. The concept proved that the F-16C could cue and fire the HARM using directions sent from another platform. The downside was that the F-16 couldn’t carry the sensors of the F-4G since there was no space available inside the airframe.

The F-16CJ/DJ is a dedicated SEAD (Suppression of Enemy Air Defenses) aircraft with the HTS (HARM Targeting System) pod mounted under the starboard side of the intake and a pair of AGM-88 HARMs. The aircraft received improved engines in the form of the F110-GE-129 (Block 50) or F100-PW-229 (Block 52).

F-16C CCIP

F-16C/D CCIP

The last production F-16CJ/DJ aircraft were built to Common Configuration Implementation Program (CCIP) standards (the USAF version of MLU). The CCIP will update Block 40/42/50/52 aircraft with common color displays in the cockpit, updated avionics, and the ability to carry more advanced weapons. The most distinguishable feature of the CCIP is the addition of the bird cutter IFF antennas to the nose. The HTS pod is relocatable to the port intake station to make room for the Sniper or Litening FLIR pods on the starboard side. Block 40/42 aircraft will also be capable of carrying the advanced FLIR pods as well.

F-16C/D Block 50+/52+

This is the was the stepping stone between Block 50/52 and the then-unavailable Block 60/62 that featured the updated avionics and weapons capabilities of the CCIP with the option of conformal fuel tanks. The Hellenic Air Force (Greece) selected the Pratt-powered Block 52+ to serve as its next generation strike aircraft. These aircraft have the same IFF antennas on the nose and color displays in the cockpit as the CCIP. The difference is the option for conformal fuel tanks over the wing roots that also is available for Block 60/62.

F-16E/F Block 60/62

F-16C Block 60The F-16E/F is the designator given the Block 60/62 Vipers. These are not currently slated for USAF service (though they’d be much cheaper than the F-35), but are equipping the Air Force of UAE, with more customers to come.

The Block 60 is powered by the F110-GE-132 while the Block 62 is supposed to be powered by the F100-PW-229A (UAE selected the engine).

The F-16Fs have the dorsal spine that runs from behind the cockpit through the base of the vertical stabilizer. This serves as an avionics bay for additional capabilities for the aircraft.

The F-16E/F have the bird cutter antennas, a built-in FLIR system in the nose, and are capable of employing the conformal fuel tanks.

Viper Visible Differences

F-16A/B Blocks 1-10 Block 15 MLU Block 20 F-16A ADF    
Engine F100 F100 F100 F100 F100    
Intake NSI NSI NSI NSI NSI    
Landing Gear Normal Normal Normal Normal Normal    
Main Gear Doors Normal Normal Normal Normal Normal    
Landing Lights Main Gear
Mounted
Main Gear
Mounted
Nose Gear
Door
Nose Gear
Door
Main Gear
Mounted
   
HUD Normal Normal Normal Normal Normal    
Intake Pylons N/A N/A Litening Litening N/A    
Conformal Tanks N/A N/A N/A N/A N/A    
IFF Antennas N/A N/A APX-113 APX-113 APX-109    
AIM-120 N/A N/A Yes Yes AIM-7    
AGM-88 N/A N/A N/A N/A N/A    
F-16C/D Block 25 Block 30 Block 32 Block 40 Block 42 Block 50 Block 52
Engine F100 F110 F100 F110 F100 F110 F100
Intake NSI NSI/MCID NSI MCID NSI MCID NSI
Landing Gear Normal Normal Normal Heavy Heavy Heavy Heavy
Main Gear Doors Normal Normal Normal Bulged Bulged Bulged Bulged
Landing Lights Main Gear
Mounted
Main Gear
Mounted
Main Gear
Mounted
Nose Gear
Door
Nose Gear
Door
Nose Gear
Door
Nose Gear
Door
HUD Normal Normal Normal Holographic Holographic Normal Normal
Intake Pylons Litening Litening Litening LANTIRN LANTIRN HTS HTS
Conformal Tanks N/A N/A N/A N/A N/A Block 50+ Block 52+
IFF Antennas N/A N/A N/A N/A N/A N/A N/A
AIM-120 Yes Yes Yes Yes Yes Yes Yes
AGM-88 N/A F-4G Escorts
Only
F-4G Escorts
Only
N/A N/A Yes Yes
  F-16C/D F-16C/D F-16C/D F-16C/D F-16E/F F-16I  F-16N  
  Block 40 CCIP Block 42 CCIP Block 50 CCIP Block 52 CCIP Block 60    
Engine F110 F100 F110 F100 F110 F110 F110
Intake MCID NSI MCID NSI MCID NSI NSI
Landing Gear Heavy Heavy Heavy Heavy Heavy Heavy Normal
Main Gear Doors Bulged Bulged Bulged Bulged Bulged Bulged Normal
Landing Lights Nose Gear
Door
Nose Gear
Door
Nose Gear
Door
Nose Gear
Door
Nose Gear
Door
Nose Gear
Door
Main Gear
Mounted
HUD Holographic Holographic Normal Normal Normal Normal Normal
Intake Pylons Litening
LANTIRN
Litening
LANTIRN
Litening
HTS
Litening
HTS
N/A Litening
LANTIRN
 
Conformal Tanks N/A N/A N/A N/A Yes Yes N/A
IFF Antennas N/A N/A APX-113 APX-113 APX-113 APX-113 N/A
AIM-120 Yes Yes Yes Yes Yes Yes N/A
AGM-88 Yes Yes Yes Yes Yes Yes N/A

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