why is a electrical jumper being used in aircraft doors?

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sivaramakrishnan Member Join Date: Feb 2007 Posts: 9	why is a electrical jumper being used in aircraft doors? 05/28/2008 2:59 AM
	why is a electrical jumper being used in aircraft doors? Are there only electrical jumpers or any other types?Kindly give ur valuable comments. __________________ We will either find a way or make one....Sivaramakrishnan S
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32209 Good Answers: 839	#1 Re: why is a electrical jumper being used in aircraft doors? 05/28/2008 3:07 AM
	Er, might it be an electrically-released catch bolt? Er, um, or how about a proving contact to detect that the door is closed and the bolt fully home? Er, what does the aircraft maintenance manual have to say on the subject? What size aircraft - Cessna or 747? __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Sparkstation Guru Join Date: Nov 2007 Location: Christchurch, (The Garden City), South Island, New Zealand Posts: 4395 Good Answers: 230	#2 Re: why is a electrical jumper being used in aircraft doors? 05/28/2008 3:21 AM
	Hello sivaramakrishnan You have not advised which aircraft has this "jumper" referred to by yourself. I would deduce that the "jumper" you refer to, is an electrical bonding connection. The reason for all metal surfaces being electrically bonded with low-resistance connections, is in the case of either lightning and/or static charge buildup on an non-bonded metal part of the aircraft. If the complete metal shell and all metal parts are properly bonded, the aircraft acts as a "Faraday Cage", and any discharge/s do not affect either the crew, passengers, or avionics, passing around the exterior surface of the bonded metal parts. Without bonding, any non-bonded metal part could rise to a potential of several million volts, during a lightning strike, or static discharge. Advise here, with if you need more assistance. Kind Regards.... __________________ "The number of inventions increases faster than the need for them at the time" - SparkY
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Anonymous Poster	#7 In reply to #2 Re: why is a electrical jumper being used in aircraft doors? 06/16/2008 3:36 AM
	Very interesting! James P. Hollen
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master of none Commentator Join Date: May 2008 Location: Indy, USA Posts: 55 Good Answers: 2	#3 Re: why is a electrical jumper being used in aircraft doors? 05/28/2008 7:58 AM
	G.A. to sparkstation for that one. In my experience with Naval aircraft, every part of the jet was "bonded" with a stranded wire cable to an unpainted surface. I'm sure that upon closer inspection you would find much more than the doors have these. __________________ Afterism (n) - A concise, clever statement you don't think of until too late.
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DVader1000 Guru Join Date: May 2007 Location: Anywhere Emperor Palpatine assigns me Posts: 2774 Good Answers: 101	#4 Re: why is a electrical jumper being used in aircraft doors? 05/28/2008 9:40 PM
	The aircraft accumulates a lot of static electricity as it flies through the air. The jumper prevents nasty shocks and worse by ensuring the door is at the same potential as the rest of the fuselage. __________________ If only you knew the power of the Dark Side of the Force
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Snaketails Guru Join Date: Sep 2007 Location: Wrong end of the yellow brick road in Oz Posts: 930 Good Answers: 15	#5 Re: why is a electrical jumper being used in aircraft doors? 05/29/2008 2:32 AM
	Electrocution has its limits. at low levels, it can tingle, a bit higher it can give stimulus, or provide the viewer with enjoyment, much higher, you get into problems explaining to the police/doctors how the burns occured, or getting rid of the bodies. __________________ Qn, Whats the differance between a Snake and a Onion? Ans, No one cries when you chop up a Snake
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sivaramakrishnan Member Join Date: Feb 2007 Posts: 9	#6 Re: why is a electrical jumper being used in aircraft doors? 06/15/2008 9:54 AM
	thanks everyone for details the jumper was used in boeing 747 __________________ We will either find a way or make one....Sivaramakrishnan S
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Anonymous Poster (1); DVader1000 (1); master of none (1); PWSlack (1); sivaramakrishnan (1); Snaketails (1); Sparkstation (1)

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