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Software bug found in Boeing 787

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Sources: http://www.tweaktown.com/news/44887/boeing-787-dreamliner-glitch-make-lose-power-faa-reports/index.html

http://www.gizmodo.com.au/2015/05/boeings-dreamliner-has-a-bug-that-can-make-it-lose-all-power-mid-air/

 

Looks like Boeing's plane has encountered yet another problem. If exploding batteries weren't enough, this software bug has been found.

 

In testing labs at Boeing, it has been uncovered that if the aircraft has been left powered on for 248 days, the plane loses all power, mid-flight or not. Fortunately it is highly unlikely that aircraft are left powered on for that long, and the risk will remain hypothetical, but it does exist. The American Federal Aviation Administration (FAA) has issued a warning reminding airlines to regularly power off their planes.

 

Quote: "Discovered by Boeing themselves in private testing circumstances (not real flight), this issue can occur if the aircraft is not powered down between trips"

 

Quote: "The bug was revealed by tests by the Boeing laboratory, thank god, and not by some real world accident. "

 

Personally I don't believe this is a huge deal, since airlines should be maintaining their planes (planes must obviously be powered off for maintenance). But obviously a patch couldn't hurt. Unfortunately, however I think this coupled with the number of other issues this plane has has really scarred Boeing's reputation.

 

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Ok, prepare for landi-

YYYYYYEEEEEEEEEEEEEEEEEEEEROOOOOOOOOOOOOOOHHHHHHHHHHHHHHHHHHHH-

*BOOOOOOOMMMM*

rip people from software bug

 

 

I don't know why a plane would be on for that long...

 

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Lol not the first time a problem like this has happened, i believe the 777-200 had a similar problem with shutoffs, it was fixed instantly.

What model does this relate to, the power systems are different between the -8 and -9 etc.

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As a member of the Air Force, if the plane looses power there are alternatives to getting it restored. I can't talk numbers or details on my jet, but basically we can switch from the three generators to battery backup with the flip of a switch. You then can use the Bleed air pressure to restart the generators. 

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I kind of doubt that a plane would be powered on for that long.  Seems a little bit insane.

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Im amazed they actually found this problem...

did they have to wait 248 days with a plane powered on to figure out theres an issue?

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Im amazed they actually found this problem...

did they have to wait 248 days with a plane powered on to figure out theres an issue?

Safety first I guess ... I think they have to test it for an amount of hours ( Ex 70.000+ hours )

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I kind of doubt that a plane would be powered on for that long.  Seems a little bit insane.

If the aircraft is just doing a charter flight it will not power down at the airport. It will land, idle, refuel, and take off. Don't say we need to shut down the aircraft because that's not true. The flash point of jet fuel is very high IIRC (and it smells sweet).

 

Watch this video. This white plane is the RC-135 which is my plane. Pilot's seat is mighty comfortable.

https://www.youtube.com/watch?v=pl4yTHUpbdo

 

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Posted

Safety first I guess ... I think they have to test it for an amount of hours ( Ex 70.000+ hours )

Boeing has equipment simulators. Essentially a room on ground that they run all the same hardware and a fake gps track that the pseudo aircraft flies on. They can inject weather conditions and test and log the hardware. Boeing is not just a company that screws the plane together, they do much more.

 

Extra note... It's not exactly a simulator since the hardware and software is real, but it's kinda like a test rig.

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As a member of the Air Force, if the plane looses power there are alternatives to getting it restored. I can't talk numbers or details on my jet, but basically we can switch from the three generators to battery backup with the flip of a switch. You then can use the Bleed air pressure to restart the generators. 

 

Gotta remember though that military jets especially have double and triple redundant systems at the least most of the times, if not always. A commercial airliner won't have nearly as many safeguards installed as it won't be expected to fly through flak, or enemy fire. Though, I'm certain they DO have some sort of system redundancy, just not one as laid-out or elaborate as that of a military grade vehicle.

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*Yell from cockpit Over battery powered intercom* Ladies and Gentlemen everything has shutdown due to a bug, hence me yelling and talking over the battery powered intercom. Luckily we are a plane so we have wings, we are going to try and glide to safety. *10 minutes later, still from the cockpit over battery powered intercom* Ladies and Gentlemen, the wings have snapped off... We suspect this is from a bug...

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Gotta remember though that military jets especially have double and triple redundant systems at the least most of the times, if not always. A commercial airliner won't have nearly as many safeguards installed as it won't be expected to fly through flak, or enemy fire. Though, I'm certain they DO have some sort of system redundancy, just not one as laid-out or elaborate as that of a military grade vehicle.

Actually the aircraft I am on is a Boeing plane. It's just that the cabin is stripped that that's where the classified, secret, and top secret stuff is. It is still a Boeing 739-700. Our jets have the same skeleton as the 'commercial' ones.

 

Here is some information on the Boeing 747.

This aircraft has an APU (Auxillary Power Unit) which is more-or-less in the vertical stabilizer. This is a smaller jet engine which they can start to provide power to the jet without a airport supplied power cart if needed.

The jet also has two Integrated Drive Generators (IDG) also know as generators. They are in the actual engines themselves. They provide 115 VAC 400 Hz and that is sent to the BTB and can be coupled into the aircraft there. The batteries are also there as well. The flight deck equipment is in 28 vdc (from a transformer rectifier).

The only reason for two IDGs is for load sharing.

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*Yell from cockpit* Ladies and Gentlemen everything has shutdown due to a bug, hence me yelling and not talking over the intercom. Luckily we are a plane so we have wings, we are going to try and glide to safety. *10 minutes later, still from the cockpit* Ladies and Gentlemen, the wings have snapped off... We suspect this is from a bug...

Interphone is on battery power. :P

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Interphone is on battery power. :P

Shhh. No one needs to know *Goes to edit post*

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Actually the aircraft I am on is a Boeing plane. It's just that the cabin is stripped that that's where the classified, secret, and top secret stuff is. It is still a Boeing 739-700. Our jets have the same skeleton as the 'commercial' ones.

 

Here is some information on the Boeing 747.

This aircraft has an APU (Auxillary Power Unit) which is more-or-less in the vertical stabilizer. This is a smaller jet engine which they can start to provide power to the jet without a airport supplied power cart if needed.

The jet also has two Integrated Drive Generators (IDG) also know as generators. They are in the actual engines themselves. They provide 115 VAC 400 Hz and that is sent to the BTB and can be coupled into the aircraft there. The batteries are also there as well. The flight deck equipment is in 28 vdc (from a transformer rectifier).

The only reason for two IDGs is for load sharing.

 

Well then, I'll take your word for it. I don't know much about commercial to military conversion of aircraft and other various vehicles. My knowledge starts to taper off once you leave custom military designed vehicles. As i stated though, I was certain that commercial planes had some sort of fail-safe; just not to the extent of say an attack helicopter like one from the Apache family; which as quoted from the official description of the vehicle "... a substantially large number of redundancy systems..." Since actually giving out every redundant system would be quite, bad. 

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As a member of the Air Force, if the plane looses power there are alternatives to getting it restored. I can't talk numbers or details on my jet, but basically we can switch from the three generators to battery backup with the flip of a switch. You then can use the Bleed air pressure to restart the generators. 

If you're on final approach i highly doubt you can start an APU quick enough.. .Then again i'm not a pilot :P

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If you're on final approach i highly doubt you can start an APU quick enough.. .Then again i'm not a pilot :P

You don't need electronics to fly the aircraft. The rudder, flaps, gear, etc and all be operated manually.

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Don't you just love fly by wire? <_<

I fortunately haven't flown without power, but all my instructors have on deployments. One day.

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Ok, prepare for landi-

YYYYYYEEEEEEEEEEEEEEEEEEEEROOOOOOOOOOOOOOOHHHHHHHHHHHHHHHHHHHH-

*BOOOOOOOMMMM*

rip people from software bug

 

 

I don't know why a plane would be on for that long...

it wouldn't.

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As a member of the Air Force, if the plane looses power there are alternatives to getting it restored. I can't talk numbers or details on my jet, but basically we can switch from the three generators to battery backup with the flip of a switch. You then can use the Bleed air pressure to restart the generators. 

i thought these kinds of planes use a backup turbine to power the basic functions of the plane

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i thought these kinds of planes use a backup turbine to power the basic functions of the plane

There has to be a backup. I can't imagine it going through the design phase without multiple redundant systems.
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There has to be a backup. I can't imagine it going through the design phase without multiple redundant systems.

 

there's a generator in each engine providing power, and if they all fail there is a small turbine that can be dropped that provide enough power for primary systems, the batteries are also usually capable of providing power to primary systems for a reasonable time as well. generally everything on a plane that is primary has 3 levels of redundancy

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Best case scenario would have been to prevent this bug but definitely a relief that this was found by Boeing by simulation. 

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