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Lockheed's F-22 Raptor Gets Zapped by International Date Line
DailyTech LLC ^
| February 26, 2007
| Brandon Hill
Posted on 02/26/2007 2:47:19 PM PST by SubGeniusX
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To: StockAyatollah
somebody let an IT monkey I'm betting it's the switch from -180 to +180 Longitude. I've written several moving map programs, and mine don't handle the situation either. They're for land use, so it's overhead I don't need.
(said some stupid stuff above, like reversing longitude with latitude and 190 degrees instead of 180 - yeah, I do this for a living - sheesh)
101
posted on
02/26/2007 4:55:19 PM PST
by
narby
To: miliantnutcase
I thought it was the Metrosexual Algorithmic Calculator.
102
posted on
02/26/2007 5:01:49 PM PST
by
Thumper1960
(Unleash the Dogs of War as a Minority, or perish as a party.)
To: narby
You said yours were for land use. (I hope neither you nor your company are selling any of these map programs as a reusable component.) Anyway, the F-22 avionics systems would (should) have had a requirement for crossing the IDL as well as functioning at all Lat/Longs and altitudes. If the testing phase was allocated enough resources, which almost never happens, this might have been avoided. Although now I see other replies which doubt this really ever happened. Maybe this story is just another "tech journalist" getting the details wrong, which almost always happens!
To: fremont_steve
"There is a story about the F16 flipping to inverted flight after crossing the date line from years back."
It's usually the equator, caused by a sign error. I've personally seen it before (caught in testing though!), but not on the F-16
To: ßuddaßudd
You're right.
105
posted on
02/26/2007 5:29:58 PM PST
by
phantomworker
("The weak can never forgive. Forgiveness is the attribute of the strong." --Gandhi)
To: Christopher Lincoln
See this link for the Air Force story The Air Force briefing by Air Force officers on an Air Force base about this incident did say the glitch occured due to crossing the International Date Line.
It's not that surprising. You'd be amazed how often this kind of thing happens on new systems....
106
posted on
02/26/2007 5:33:39 PM PST
by
Cogadh na Sith
(There's an open road from the cradle to the tomb.)
To: adorno
I haven't seen any of those blue screens since 1998. You've been robbed.
To: Ramius
Sure, maybe there's a ~clock~ display that can have a local zone adjustment, but beyond that there's no purpose to it. It might not have anything to do with the date, it could be a glitch in the navigation system that has trouble handling the '180 deg' meridian....
Or, it could be that the system requires a hard start every 24 hrs and when the date rolled over, it checked its log, restarted and came up in a limited mode....
It's not hard to imagine at all how this could happen. I take it you don't work with complex SW systems.
108
posted on
02/26/2007 5:38:06 PM PST
by
Cogadh na Sith
(There's an open road from the cradle to the tomb.)
To: narby; Ramius
I'm betting it's the switch from -180 to +180 Longitude. I've written several moving map programs, and mine don't handle the situation either. They're for land use, so it's overhead I don't need. That's my guess as well.
109
posted on
02/26/2007 5:39:19 PM PST
by
Cogadh na Sith
(There's an open road from the cradle to the tomb.)
To: SubGeniusX
So that's where the Y2K bug went.
110
posted on
02/26/2007 5:41:05 PM PST
by
hattend
(Two thirds of the world is covered by water, the other third is covered by Champ Bailey - Go Broncos)
To: Cogadh na Sith
111
posted on
02/26/2007 5:56:22 PM PST
by
phantomworker
("The weak can never forgive. Forgiveness is the attribute of the strong." --Gandhi)
To: Candor7
I'm not seeing it either. I can't speak for comms or other systems, but for navigation, every GPS system I've seen gets its date/time stamps from the satellites, in GMT. The Date Line doesn't mean squat when you're using GMT.
112
posted on
02/26/2007 5:58:52 PM PST
by
GATOR NAVY
(Naming CVNs after congressmen and mediocre presidents burns my butt)
To: SubGeniusX
I wonder if they installed the new DST patches yet.
113
posted on
02/26/2007 6:03:38 PM PST
by
bmwcyle
(It is time to stop the left at the wall.)
To: SubGeniusX
![Image and video hosting by TinyPic](http://i16.tinypic.com/x5xnx3.gif)
"When the group of Raptors crossed over the IDL, multiple computer systems crashed on the planes."
114
posted on
02/26/2007 6:11:24 PM PST
by
Garvin
(As an American, I want to win in Iraq!)
To: Ramius
Uh... this sounds like an urban legend to me. The dateline appears on maps, not in the air. I can't see how it would have any effect whatsoever.
Upon crossing the IDL your GPS is going to give you a big jump in time and the longitudes may change signs. I can see a glitch in there.
To: phantomworker
Commerical airliners have never crossed the international time line? I don't buy this. Unless it is April first
116
posted on
02/26/2007 6:21:15 PM PST
by
nepppen
(RESISTANCE IS FUTILE..............DUNCAN HUNTER FOR PRESIDENT..............)
To: Garvin
I could see that happening.
The computer nav. systems track Global locating Satellites as well as ground based Military Loran systems. There could easily have been a program glitch when the nav systems told the computers that the day had suddenly began all over again.
They obviously couldn't handle the fact that all the 24 hour data already stored for the day had to find room for a 48 hour day.
Or something like that.
To: M. Dodge Thomas
One of the first things the Air Force test pilots tried on an early F-16 was to tell the computer to raise the landing gear while standing still on the runway. Guess what happened? Scratch one F-16. (my friend says there is a new subroutine in the code called 'wait_on_wheels' now...) [weight?]Weight on wheels (WOW). I worked for GD back in 86-90. I've never heard such a thing. WOW is an interlock for the gear on all aircraft.
118
posted on
02/26/2007 6:28:05 PM PST
by
Mr.Unique
(Why did Lloyd Dobler want Diane Court anyway??)
To: AntiKev
119
posted on
02/26/2007 6:28:45 PM PST
by
Former Proud Canadian
(How do I change my screen name after Harper's election?)
To: SubGeniusX
I probably speak for a lot of the computer programmers reading this thread when I say I read this article thinkng, "Thank God it wasn't my code."
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