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Surprising Cause of Oshkosh F-16 Runway Overrun

By Stephen Pope / Published: Feb 24, 2012
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F-16 Oshkosh Overrun

The F-16 lies nose-over after overrunning
the runway at Oshkosh last year.

Remember that runway overrun by an F-16C at Oshkosh last summer (see it on video here)? Plenty of armchair pilots speculated about why it might have happened, with possible causes centering on what many presumed was a brake problem or perhaps too high an airspeed on final. It turns out that not a single one of us was right. An Air Force investigation made public this week revealed that a severely fogged-over canopy, caused by the failure of the F-16’s environmental control system, was to blame for the July 2011 mishap.

Investigators said “extreme fogging” in the cockpit led to the fighter overrunning Runway 36 at Wittman Regional Airport by 300 feet, causing more than $5 million in damage to the F-16. The Air Combat Command Accident Investigation Board in Hampton, Virginia, said the pilot’s visual cues were completely obscured by fogging from the faulty ECS as he approached to land on the 8,000-foot runway. The board also noted that the pilot briefly considered ejecting but feared for the safety of EAA AirVenture spectators nearby.

The F-16 pilot, assigned to the 100th Fighter Squadron, 187th Fighter Wing at Dannelly Field, Alabama, was unhurt in the incident, but the jet sustained major damage when it’s nose gear collapsed and the engine ingested significant mud and debris. Nobody on the ground was injured in the overrun, which was caught on camera by several AirVenture attendees. Investigators noted that if not for the lack of outside visual references, the pilot could have come to a stop on the runway with about 1,000 feet to spare.

View our Oshkosh 2011 photo gallery.

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chalete's picture

Could not the pilot had gone around and try to fix the problem while holding somewhere rather than continued with the landing if was not able to see anything, he put his life and hundreds of other's in peril.

Snik's picture

He could have done - but accelerating blind down a runway and taking off into one of the busiest circuits in the world in an F16 doesn't seem a very sensible option to me.

Sure his life was in danger - but hundreds of others? As I recall from visiting Osh the spectators are pretty well separated from landing aircraft - if he had gone round he would have put a lot more at risk.

Also once airborne how does he fix a ventilation problem while flying a combat jet? If he couldn't fix it how does he see to get it down again?

IMO he did the right thing - stayed with it and stopped it. Respect.

cnkiv's picture

Seems to me he might have had a couple of more options. 1) Go around and hold untill he could wipe it off. 2) Pop the canopy. A lot less expensive than the damage observed.

yahan lee's picture

When did the ECS failed; was he running low on fuel? Riding wheelies down the runway even though his live was in danger? How funny.

Mike Schrader's picture

Under the circumstances it was a great landing, the pilot walked away and no additional people were hurt. He made a decision and all that was done was some damage to a piece of equipment. It looks as though it was done right, good job.

GeffMcCarthy's picture

I was the first F-16 Pilot-Physician in the USAF, 82-88.
Readers should know that the airplane was designed as a single purpose, simple, light, dedicated fighter - the Lightweight Fighter. It is used today mostly as a bomber.
Thus, there is no defrost outside the canopy, and if I remember correctly, none inside either. There is more than ample airflow, in fact, it is so loud that some pilots wear ear plugs under the helmet.
When the environmental system shut down, there was no airflow into the cockpit. The cold-soaked cockpit was immediately covered with dense condensation inside. Any outside rain or condensation simply flows up and off the canopy. Inside, the canopy has minimal fogging; the environmental air is essentially completely dry, heated or cooled air.
As to his best actions, I have learned not to be a smug, Monday-am, quarterback: As a HF expert, here is my estimate of his choices, and the emotional, primal, substrate:
He could have gone around on instruments, assuming enough fuel. But, that would have required problem solving while trying to fly a low altitude pattern, communicate with FAA, etc.
As to the canopy, it is a one-piece structure, designed for perfect forward visibility. In that respect it is superb. However, there is nothing but a 5"x5" HUD glass between the outside wind and the pilot. Jettisoning the canopy is simply not a viable option. Plus it weighs 400lb+ and would have been an unguided missile headed towards the Oshkosh crowd.
Moreover, under stress, the best of us does not really exercise reason - not you, not me. We react from primal survival imprints. In this case ejection is one of those deeply imprinted reactions; I assume the pilot reached for the handle, then remembered the crowds...
His/her strategy almost worked. The jet ran off the runway at the end of the landing roll, jeopardizing only the pilot. And real danger it was: No fighter cockpit offers any impact protection -my Cessna has more ground survivability - and many pilots have died, even without fire, in damaged cockpits.
In this situation, I think I would have selected the same course of actioin...with the same result. I'm glad that nobody was hurt, and that the USAF made reasonable conclusions in the accident analysis.

HalfAwake's picture

He should have rolled the window down a bit.

HiHoStevo's picture

ROFL

Biggest case of CYA I have read in an while.

How much do you want to bet the pilot was not an O-1... but rather someone considerably more senior ??

ADMorrill's picture

Fogged-over canopy? ...really? What an odd excuse for an overrun. Does the Air Force not understand that there were a couple thousand eyewitnesses there watching this go down? There's been a lot of chatter over on the EAA boards and while there are some conflicting stories about what people think they saw, there isn't a single person who noticed fog on the canopy of this F-16. In fact, several people claim that the pilot was actually waving to the crowd as he sped past ( though I did not see that personally.) Sure is hard to see the pilot if he was fogged in... and yet everyone could see him just fine.

The aircraft did touch down a little late, but then it just sailed down the runway as if there were no brakes - he didn't even deploy the speed brake. Call me crazy, but if I am not mistaken, a fogged canopy would not prevent a pilot from applying brakes. Nor would it prevent him from seeing his HUD, which would allow him many options, including a go-around. Between a functioning HUD and a top-notch flight control tower there at the field a truly fogged canopy would likely have been treated as being similar to entering IMC. Does a highly experienced fighter pilot with a perfectly functioning aircraft think about ejecting just because he enters IMC? I think not.

Sorry... but I simply don't understand why the AF is trying to sell this story at all. Why is the truth such a bad option?

Strmn8r's picture

I question this too, how was he able to land and maintain runway alignment when he couldn't see enough to know how far down the runway he was? Also Duluth is approx. 150 miles nw of Oshkosh and has a 2 mile long runway and an F-16 Guard unit there, if he had the fuel that would've been a great option, but that's hindsight and not knowing the circumstances.

DFaile@aol.com's picture

Here is my take on this accident, and I am speaking from experience, but not in an F-16! A few years ago, I had an "extreme fogging" experience except that it was oil on the outside of the bubble canopy. I flew by instruments to the nearest airport. When lining up for landing, I could see nothing! I would not have been on the runway except for the guidance of a Certificated Flight Instructor who was, luckily for me, on the ground in an airplane and able to provide me with guidance on the CTAF frequency. Once on the ground, I used MAXIMUM braking to minimize the chances of an overrun! Until I was stopped and opened the canopy, I was not even sure I was on the runway! A few months later, when the FAA gave the Flight Instructor an award for his assistance in this incident, he asked me if I knew I landed diagonally on the runway?

Here is where I think the F-16 report is hard to understand. The report states that, "if not for the lack of outside visual references, the pilot could have come to a stop on the runway with about 1,000 feet to spare." If the F-16 pilot did not have adequate "outside visual references" maybe he should have used MAXIMUM braking to try to bring the F-16 to a stop in the shortest possible distance (even if that meant burning up some brakes and tires)? According to the report, that would have been about 1,000 feet from the end of an 8,000 foot runway. I am not taking anything away from the skills of a highly trained military pilot and I was not with him in the cockpit but why not use maximum braking if you cannot see outside?

DFaile@aol.com's picture

Here is my take on this accident, and I am speaking from experience, but not in an F-16! A few years ago, I had an "extreme fogging" experience except that it was oil on the outside of the bubble canopy. I flew by instruments to the nearest airport. When lining up for landing, I could see nothing! I would not have been on the runway except for the guidance of a Certificated Flight Instructor who was, luckily for me, on the ground in an airplane and able to provide me with guidance on the CTAF frequency. Once on the ground, I used MAXIMUM braking to minimize the chances of an overrun! Until I was stopped and opened the canopy, I was not even sure I was on the runway! A few months later, when the FAA gave the Flight Instructor an award for his assistance in this incident, he asked me if I knew I landed diagonally on the runway?

Here is where I think the F-16 report is hard to understand. The report states that, "if not for the lack of outside visual references, the pilot could have come to a stop on the runway with about 1,000 feet to spare." If the F-16 pilot did not have adequate "outside visual references" maybe he should have used MAXIMUM braking to try to bring the F-16 to a stop in the shortest possible distance (even if that meant burning up some brakes and tires)? According to the report, that would have been about 1,000 feet from the end of an 8,000 foot runway. I am not taking anything away from the skills of a highly trained military pilot and I was not with him in the cockpit but why not use maximum braking if you cannot see outside?

Warren Webb Jr's picture

With no visual reference, he landed and rolled down the runway quite accurately in the video, but couldn't apply any brakes. Stephen Pope, help us understand why the brakes couldn't be applied. Thank you.

Shlanico's picture

For cnkiv; Pop the canopy? LMAO!

For yahan lee; Riding wheelies down the runway?! Another LMAO!

You Flight Sim KeeWees crack me up!

rok_hunter's picture

The "fogging" they're likely referring to isn't the 'window fogging' most may be familiar with; the F-16 ECS is capable of producing actual FOG inside the cockpit, rather than mere fogging on the canopy that can be wiped off. (To that effect - when strapped in, it is impossible to reach forward of the HUD and wipe the canopy to begin with. The average person, or myself at 6', can't reach more than a couple of inches past the HUD with the lap belt on. The best he could have hoped for was to wipe an area above and to the sides of the HUD, which at the landing AOA of 13 degrees doesn't do squat for forward visibility. Loosening the lap belt to wipe it is NOT an option, as a subsequent ejection, either intentional or accidental, would likely be fatal.)

On an A/C model you get ECS air at two locations: Behind the seat/aft of the consoles, and through "canopy defogging" louvered openings forward of the HUD. Even on the ground, we regularly observed fog blowing from the ECS ducts and dissipating within a couple inches of the duct once the cold air mixed sufficiently with ambient cockpit air. If the ECS system was blowing actual fog, the openings forward of the HUD would put all the fog directly in the pilots field of view, but it would most likely dissipate without filling the whole cockpit for the reasons mentioned above. This exact scenario can render forward visibility to near zero, but leave up/side visibility unimpeded.

So what's the fix, assuming a normally functioning ECS? Turn the heat up. It's the cold air on a hot/humid day that creates the blowing fog. This isn't something that a smart pilot would do on landing roll, and it takes several moments for the temperature to change anyhow. For a malfunctioning ECS, he might not have had that option. Perhaps he was a few knots fast and subsequently landed long because he WAS trying to turn the heat up - an F-16 will float considerably if your approach speed isn't correct. Maybe that's why he didn't extend the speedbrakes, too. As for braking - max anti-skid braking, with aft stick, will keep the nose up until you've slowed down quite a bit. That's the normal short-field landing procedure, by the way.

As for the O-1/CYA perception, anyone in the Air Force will tell you that AF management won't hesitate to hang someone out to dry if they screwed up. Have any of you read the accident report from the Alaska F-22 crash, where they blamed the pilot of being "too distracted due to his inability to breath" as the cause of his fatal accident?

Unless someone can come on here and refute my six years of F-16 maintenance experience and subsequent 6 years as an aircrew member, or Geff MCarthy's six years as a flight doc at an F-16 base, and provide a more experience-based explanation: Perhaps the armchair Cessna F-172 and Piper FA-28 crowd ought to quit throwing darts at a pilot who, given the circumstances, did a pretty decent job.

spope's picture

@Warren He did apply the brakes but couldn't stop in time. The pilot stated that the fogging in the cockpit completely blocked his forward view and that he experienced vertigo, felt like he was tumbling backward, and that it was like his head was "inside a white plastic bag." He thought he had enough runway remaining, but obviously didn't. There was no way he could do a go around because he couldn't see his instruments or HUD. Photos in the accident report show the fogging, which occurred as he touched down. He tried cycling the ECS twice during the rollout but it did no good. There's a link to the report in the article above. SP

ADMorrill's picture

@rok_hunter - Thank you for the excellent explanation of the F-16 ECS and your take on what might have been happening inside that cockpit. I was very skeptical of the AF answer... it just didn't jive with what I thought I saw. But thanks to your write-up it all makes MUCH more sense now.

gwalston's picture

I read that he didn't use the speed brakes as he was concerned that his nose high attitude would cause contact with the runway. Having flown the F-16, you can grind the lower speed brakes with too high angle on rollout, but that would seem preferable to rolling off the pavement. The F-16 is notoriously bad off the pavement. Almost every accident in the grass results in a sheared nose wheel and sometimes a rollover (one I am very familiar with as a pilot in my unit tried that and the crash team had to use an abrasive saw to get him out of the cockpit.). I noted in the video that he was able to keep the aircraft on the runway until the end and I didn't see tire smoke from max braking...

gwalston's picture

I read that he didn't use the speed brakes as he was concerned that his nose high attitude would cause contact with the runway. Having flown the F-16, you can grind the lower speed brakes with too high angle on rollout, but that would seem preferable to rolling off the pavement. The F-16 is notoriously bad off the pavement. Almost every accident in the grass results in a sheared nose wheel and sometimes a rollover (one I am very familiar with as a pilot in my unit tried that and the crash team had to use an abrasive saw to get him out of the cockpit.). I noted in the video that he was able to keep the aircraft on the runway until the end and I didn't see tire smoke from max braking...

rok_hunter's picture

Great points gwalston, my only note is that with a properly functioning anti-skid system, you shouldnt see any tire smoke even at max braking. It's just like the ABS in your car...if the system detects a wheel starting a skid, it relaxes braking pressure on that wheel until it speeds up again. If a tire locked up, we could assume an inoperative anti-skid system and a subsequently longer landing roll (skid? Lol).

johnbpatson's picture

Must remember that one -- almost as good as "swerved to miss the elk."

archer51's picture

Wait, he's from AL and doesn' t know how to deal with 'IFR in the cockpit'? I trained in TX and FL in jets equipped with OBOGS where its guaranteed to fog over every time you come down from altitude in the summer. Every 'boot' 2ndLT knows how to deal with this: cockpit defog ON prior to landing to warm up the glass. I can't believe the AF lets this guy off the hook for such a rookie mistake - its what happens when you fly single, without your lead.

coutinho's picture

Where is the parachute? Such an Emergency requires it!

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