Home » Wars » Afghan Update » Single Part Breaking Lost a $72 Million Drone

Single Part Breaking Lost a $72 Million Drone

by John Reed on March 7, 2012

On August 11, 2011 Air Force ground controllers lost contact with one of the military’s most advanced — and expensive — drones, an EQ-4B Global Hawk as the jet flew high over Eastern Afghanistan.

Nine hours into an otherwise smooth communications relay mission using the Battlefield Airborne Communications Node (BACN), the plane was cruising at 51,000-feet above sea level 105 nautical miles northwest of Kandahar, Afghanistan — close to the border with Pakistan, in fact, the few news reports that emerged of the crash claim the jet actually went down inside Pakistan —   when a pilot from the 12th Reconnaissance Squadron out of Beale Air Force Base in California “lost all links with the payload,” according to a copy of the Air Force’s report on the incident that the service sent to DT. The pilot did everything he could to reestablish communications with the mammoth drone, but 25 seconds after losing communications, the plane began a high-speed fall to Earth. If plummeted so fast that “both wings and at least one of the lower aft fuselage fairings” were ripped off the jet as it fell. Three minutes later, the Global Hawk crashed into “remote, desert terrain approximately 4 nm from its last reported position and was destroyed,” reads the Air Force’s report. “the estimated loss is valued at 72.8 million.”

So, what caused this?

A single part — or Line Replaceable Unit, as the report calls it — came undone, interrupting the flow of electricity to the plane’s aileron and spoiler actuators — the tiny motors that control the movements of an aircraft’s flight control surfaces you know, the moving parts of the wings that control whether the plane climbs, dives, banks, rolls, etc. As expected, this disconnection rendered “the aircraft uncontrollable.”

(Critical parts that lose it like this one are called single points of failure, meaning that if these sometimes tiny and seemingly insignificant parts fail, the entire weapon system fails. Naturally, military equipment makers try o identify these and do all they can to ensure they won’t fail.)

Why did this single part become disconnected? “The board president also found, by a preponderance of the evidence, that the LRU [the critical part] installation methods were a contributing factor in the mishap,” reads the a summary of the report. Apparently, the screws holding the part in place weren’t tight enough and probably shook loose due to typical flight vibrations.

One other thing to note, the jet’s “avionics were not recovered from the crash site.” Let’s hope they were destroyed in the crash and the subsequent bombing of the wreckage by Air Force bombers and not scooped up by someone who could sell them to the Russians or Chinese.

Click through the jump to read a copy of the accident report.

EQ-4 Crash Final Report for Distribution

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{ 72 comments… read them below or add one }

TMB March 7, 2012 at 3:08 pm

105 miles northwest of Kandahar? That's still inside Afghanistan, but headed in the direction of Iran.

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Kent Seering March 7, 2012 at 4:00 pm

I believe he meant Northeast, but that is what the report says, too. Maybe he meant that it crossed into Iran? That makes a lot more sense.

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LtKitty March 7, 2012 at 3:09 pm

Poor drone… it just goes to show how delicate complex technology can be. I fully acknowledge accidents are bound to happen, especially given how much more often these things are flown. However, the loss of a $72.8 million drone due to a few loose screws is an unacceptable mistake. Get 'er done Air Force.

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blight_ March 7, 2012 at 2:31 pm

It's kind of shocking, especially when you're used to good design producing results like an F-15 that can fly after an entire wing gets ripped off.

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LtKitty March 7, 2012 at 2:48 pm

Or the A-10. I am by no means an expert, though, but I think there's certain tradeoffs and other variables that make the Global Hawk less resilient to disaster. I certainly would like to understand the design considerations because I hope to be working on super cool projects like the Global Hawk. I'm starting to learn that 20-20 hindsight is a blessing and a curse…

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brianckramer March 7, 2012 at 3:06 pm

@ 50,000 ft for 14,000nm and 42 hours?

They each have a purpose, one isn't better than the other. Plenty of 15's have crashed as well.

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blight_ March 7, 2012 at 3:53 pm

Fair enough, but many of those F-15 failures happen because the aircraft is old. The Global Hawk can't possibly be that old…though I suppose being young means all the small things that can cause issues like this haven't been found yet.

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tiger March 7, 2012 at 7:23 pm

Uh, want to re think that one? No, wing equals no fly.

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blight_ March 7, 2012 at 7:28 pm

http://en.wikipedia.org/wiki/1983_Israeli_Air_For

Though technically it was more like he landed with a wing totally shorn off, but that's a pretty amazing "point of failure".
http://www.sky-high.co.il/image/users/134771/ftp/

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4FingerOfBourbon March 7, 2012 at 7:44 pm

That is crazy….

ChuckL March 13, 2012 at 9:18 pm

Sorry Tiger, but one F-15 did in fact suffer a mid-air collision with an accompanying escort and have a wing completely torn off. It occurred at high speed and the pilot recovered control. He found that at speeds above 250 knots he had adequate control and elected to try to land the plane as he felt that the information to be gained would be invaluable.

The inspector who arrived insisted that this had to be a ramp strike until shown the chase plane films.
The capability was attributed to the wide flat bottom of the F-15.

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Splitpi March 8, 2012 at 10:21 am

The problem is the design, since it was never classified for manned flight the design and redundancy systems are less stringent. Thus allowing for more single point of failure items that lead to catastrophic failure.

That is not to say that UAV's cannot be robust, rather I think this was a case where design cost and maintenance trumped robustness. Perhaps the long term operational cost savings is greater than a catastrophic failure?

Here's a fun video of a Remote Controlled Semi-autonomous plane loosing 80% and still being controlled due to the avionics.. http://www.youtube.com/watch?v=xN9f9ycWkOY

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Splitpi March 8, 2012 at 10:36 am

If anyone cares… the Global Hawk gets 3.88 mpg. That really is not that bad of performance.

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TMB March 7, 2012 at 3:08 pm

When the F-16 was first fielded, there were crashes due to electrical failure because some of the wiring was rubbing against a protruding screw.

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ChuckL March 13, 2012 at 9:24 pm

Perhaps they should use spring loaded connectors as have been common on 75 ohm communication cables. I believe that the one I am thinking about is a TNC connector.

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Yourfriend March 7, 2012 at 3:52 pm

Or this is just a cover up for the Chinese testing out sat-com link jamming and such. Especially since they are viewing UAVs as a next gen threat.

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Lance March 7, 2012 at 3:55 pm

Its not the Federal Government w/o multimillion dollar mistakes. How ever a self destruct device may be needed more than anything else in drone improvements to prevent a Iran 2.0

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Jazz ism March 7, 2012 at 4:11 pm

It served its purpose and no pilots are lost. Expensive but that’s what drones are for. Easier to replace. Now we are receiving the actual benefit of the drone.

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tiger March 7, 2012 at 4:41 pm

Tip to the USAF: Go to a hardware store. Spend $2.50 for a tube of Loc-tite thread locker. Save $72. million…..

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F-15 maintainer March 9, 2012 at 1:19 pm

A spool of MS20995CY20 (0.020") lock wire is even cheaper and doesn't have a shelf-life like a thread locking compound does.

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Darrel March 10, 2012 at 6:33 pm

What happened to safety wire for electrical connetions? Guess I am OLD SCHOOL (1952, USAF.

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itfunk March 7, 2012 at 5:02 pm

Post should be entitled shoddy contractor maintenance costs another 74 million. No single part failed the contractors simply didn't know how to install their own companies equipment properly.

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Morty March 7, 2012 at 6:26 pm

Where so far ahead tech wise, so do we really need another billion dollar project

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tom mccoy March 8, 2012 at 10:52 am

We're not that far ahead of China……we leave a model to reverse engineer behind every time one of these things crash.

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Morty March 7, 2012 at 6:28 pm

like the F-35 wasn't enough to break the bank.

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Skyepapa March 7, 2012 at 6:31 pm

This accident is completely absorbed in a normal distribution. Move on.

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TGR March 7, 2012 at 6:52 pm

Accidents happen, especially to RPAs. There has been over $2B worth of RPAs lost in the last decade, and they are only going to get more expensive and still rain out of the sky

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stephen russell March 7, 2012 at 8:41 pm

Bad Parts QA? Fake part used??
Sabotage?

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blight_ March 7, 2012 at 8:46 pm

God knows.

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joe March 8, 2012 at 4:05 am

Not connecting the damn thing in right. Note the use of the phrase "came undone". It's easy enough to do, given the amount of plumbing and wiring required to ready a combat aircraft after a service (I don't know – but it's not unreasonable to assume – that drones are as bad).

More than enough combat aircraft have been lost over the years because a clamp has not been tightened enough, or been overtightened, or whatever. Nothing is necessarily wrong with the bits.

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blight_ March 8, 2012 at 10:30 am

I guess, but can they assess this from a smoking hole in the ground? Unless Global Hawks have armored black boxes…

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passingby March 7, 2012 at 9:08 pm

72 million? chump change.

a broken Congress plus a broken White House have been costing the US and the world billions of times more.

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Anom deplume March 7, 2012 at 9:52 pm

Suggested followup questions for the members of the press to ask.
1. What, if any, part of the component failure leading to this incident would have been prevented or mitigated if the GH had been truly 'weaponized' after it had been drafted into the operational inventory as a DARPA project?
2. Has anyone in the GH program advocated increasing the redundancy of the control systems? If yes, who (govt, contractor)? Were the systems made more robust? If not, why not?

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blight_ March 7, 2012 at 10:14 pm

1 and 2 would probably have led to increased costs; and even then might not have saved the Global Hawk from an accident tomorrow or next year. I think we're building UAVs to lesser standards, anticipating that we can replace them quicker and with more turnover if they are cheaper, and if they destroy themselves in sufficient quantity via attrition.

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Bruno Watt March 8, 2012 at 3:26 am

The whole point of drones is to avoid human casualties in the risky everyday theatre of war, which includes minor part failures. Nothing is perfect but as far as weapons go the Global Hawk comes pretty close.

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guest March 8, 2012 at 7:23 am

What does loss of electricity to an actuator have to do with the initial loss of all comm. links between controller and drone before it started its downward fall?

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tiger March 8, 2012 at 11:01 am

Well Actuator is fancy name for a Servo motor like RC planes use. Without power, the control surfaces don't move. I guess a open circut developed. So power was lost to the comunication links as well?

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RunningBear March 8, 2012 at 11:12 am

The loss of the control surfaces would lead to the immediate loss (misalignment) of the satellite link. Similar to the function of ripping the wings off while falling 10 miles in three minutes, Sadly, also a BACN.

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Dfens March 8, 2012 at 8:11 am

Sounds like pilot error to me. What, there's no pilot to blame? It can't possibly be the contractor's fault. They hire lobbyists. They buy US Senators. It's funny, manned airplane crashes are always the pilot's fault, but manned aircraft crash at 1/100th the rate of unmanned vehicles. They never get credit for all the times they saved the US taxpayer millions of dollars, or rode an airplane into a smoking hole in a field instead of living through an accident that caused many ground casualties.

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FONZIE March 8, 2012 at 8:34 am

You can have the highest tech product, but if your quality controls were lacking then it doesn't mean crap. The THAAD missile from Lockheed Martin had these problems during the testing phase. The govt almost cancelled the program because of quality issues.

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tom mccoy March 8, 2012 at 11:48 am

Do we blow these things up after a crash or are we providing China with a model to reverse engineer?

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tiger March 8, 2012 at 11:38 am

Based on the one we lost in Iran, there is no self destruct system.

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Uranium238 March 8, 2012 at 11:50 am

Bummer… sure is a pretty looking drone =(

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PrometheusGoneWild March 8, 2012 at 12:13 pm

I worked on aircraft.
All critical parts need to be safety wired.
Someone needs to get in trouble for not requiring a fastener with a small hole for that.

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MikeK March 14, 2012 at 4:25 am

What decade did you work on A/C? Did Orville and Wilbur know you by name? I PRESENTLY work on all types of heavy lifters and warbirds. We don't always use safety wire, we use a variety of fasteners that are called out in the maintenance manuals and IPC's.

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PrometheusGoneWild March 16, 2012 at 6:41 pm

Granted it has been a decade. And I was working on an antique onto itself in the F-14C.
But whats great about safety wire is it was used on all critical mechanical parts and it was very OBVIOUS to see.
I am glad you "use a variety of fasteners that are called out in the maintenance manuals and IPC's.",
But my planes did not crash because something came loose…..

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RunningBear March 8, 2012 at 12:19 pm

Does the USAF actually fly any a/c without safety wiring the connectors and screws? I'll check into current maintenance procedures. This is an extremely damning development for this organization. $72 million dollars buys a "heck of a lot" of safety wire and man-hours. Did they have flight insurance :) ??

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PrometheusGoneWild March 16, 2012 at 1:06 pm

Granted it has been over a decade and I was workIng on the F-14, which was an antique onto itself.
Maybe they used “a variety of fasteners Called out by manuals and IC’s” but it still came apart and crashed.
The nice thing about safety wire is just is VERY hard to miss if it is not on the part or put on improperly…
Sometimes things are a certain way from hard lessons learned already.

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JJAbrams March 8, 2012 at 1:30 pm

This title is beyond lame on a military site.
As if you said one fastener got loose on the wing and the plane fell, gee wiz, REALLY, a PLANE, no way.
Hello, maintenance checks are rigorous for a reason.

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Kuahiwi Bear March 8, 2012 at 4:10 pm

In my day, LRU stood for Least Replaceable Unit…which basically meant the smallest part of a "gadget" that could be replaced..what – we're getting so high tech nowadays that we have to change the meaning of an acronym? gimme a break..

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Tom Scott March 9, 2012 at 4:03 pm

In my military day, 1980-84, it was called Line Replaceable Unit. I've been at Hughes, Northrop, McDonnell Douglas and Boeing since. And they're STILL called Line Replaceable Units. Just HOW OLD ARE YOU??? You're awfully cynical too. I hope you're retired.

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Mikek March 14, 2012 at 4:33 am

NO, it's ALWAYS meant LINE REPLACEABLE UNIT – ALWAYS!!!! JEEZ!!!

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nraddin March 8, 2012 at 4:51 pm

OK so it was not a communication issue, it was not a build in flight control and navigation issue. It was a flight control cable not put into place correctly by maintenance (Or poor design). This could have happened to any aircraft that runs fly by wire, it's not a drone specific issue…. Seems like they would have some redundancy in those cables though.

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fromage March 8, 2012 at 6:23 pm

To mathesize: you're saying that 72e6 * 1e9 >= the consequence of 1 Broken Congress + 1 Broken White House. You can do math, yes? And you're not fond of hyperbole, you say?

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passingby March 10, 2012 at 1:06 am

LOL. you are one heck of a broken math major and "mathesizer"

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Mike March 8, 2012 at 8:17 pm

"For want of a nail, the shoe was lost…" I live outside Beale AFB, and they're taking this VERY seriously, believe me.

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Edwardretusaf March 9, 2012 at 6:02 pm

I guess no thought of a recovery chute.

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tiger March 10, 2012 at 3:42 pm

Nor did anybody think about 9-11 as a plan. While thinking out the box is great. We can't think of every, "what if?" You could add a chute, but at what price? Added weight, lees fuel, less room for electronics. For the small benefit, there are many cons……

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CGD March 12, 2012 at 11:26 am

1 word redundancy

It works in the marine industry!

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brian P March 13, 2012 at 8:23 pm

Who knew a part that was supplied by the lowest bidder, probably China, failed?

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MikeK March 14, 2012 at 4:21 am

How the hell would they KNOW that mount screws came loose and are responsible? I smell BS here, high and mighty BS! I postulate that something else went terribly wrong, for the umpteenth time with Global Hawk, and crashing in hostile territory is very, very unpleasant for high-value-persons in DOD! Somebody's head had to roll, and, oh well, let's just blame maintenance. Can't be unproven after you put a JADAM on the wreckage! Hey and nraddin, if it's fly by wire-there are NO CABLES!!

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Ondafritz March 14, 2012 at 9:37 am

A fail safe self distruct explosive charge activated by an AWAC's aircraft in the area should be standard procedure. That would be part if their IFF coded signals and a General officer in the AWACs aircraft would send the last radio message that the Drone receives.I strongly disagree wirh calling the technicial a pilot as most are enlisted personnel that fly these drones but thats another story for the funny papers

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ROGER March 14, 2012 at 6:24 pm

"FOR WANT OF A NAIL……… THE KINGDOM WAS LOST"

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stealthb2 March 15, 2012 at 7:06 pm

for all of you armchair mxrs, give it up. what is the price of a U2 and pilot? what about or beloved SR, would that be better? if you have no clue of what an RPA is "supposed" to do after a set time of lost comm, dont second guess. Also, anyone that has been in and or around the USAF can predict a board's findings 80-90% of the time. No pilot lost, mx fault-pilot lost, pilot error. Think, before you spew garbage from your pie-holes. BACN is out-performing expectations, in a very short time. AF Mxrs do what TOs tell them, complacency causes crashes. 'nuff said!

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stacky77 March 16, 2012 at 5:02 pm

For the want of a nail the shoe was lost. For the want of a shoe the horse was lost . For the want of a horse the war was lost. Ditto Prometheus G.W. & RunningBear. I was an A&P Mechanic before training into Flight Engineer. From the B-29 all the way to the C-124 and the C-141. Cannon Plugs and or ANY electrical connectors "GET SAFETY WIRED!!" I live near Beale AFB, I'll go see what the crew chiefs are doing these days!

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blight_ March 7, 2012 at 7:52 pm

Indeed. To clarify, there was still a stub of the wing (perhaps two feet wide?) and it might have been enough to save the aircraft. Without it, perhaps not.

But yeah. Comparing the failure of one doodad in a global hawk to getting a wing ripped off and still being able to land? Then again, if you have a UAV you have some built-in latency that prevents you from acting in real time in a responsive manner to keep your aircraft going.

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tiger March 8, 2012 at 10:52 am

Damn………
The Lord watches over crazy pilots with some handy flight computers. That guy had the "Right Stuff" in full effect that day. I'm ejecting…

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passingby March 8, 2012 at 12:16 pm

which would be an act of war

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TMB March 8, 2012 at 12:19 pm

The GH was still in Afghanistan when it crashed.

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MrN March 15, 2012 at 9:31 am

it crashed in Afghanistan and therefore was bombed in Afghanistan…where the war already is

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