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Incident: Alaska B734 near San Jose on Aug 8th 2012, loss of cabin pressure, electric failure

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Alaska Air Scare Due to Mechanical Malfunction Passengers flying from Ontario, Calif., to Seattle today said a chorus of angry infants was their first clue of a problem aboard Alaska Airlines flight 539. In the cockpit, pilots sent an emergency call from 25,000 feet to Federal Aviation Administration controllers, asking for priority landing at San Jose Airport. They told controllers that they were in the midst of a "catastrophic electrical failure with loss of some flight controls and cabin… (avherald.com) More...

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preacher1
preacher1 2
Good job here to all involved. SENSORS can go out at anytime, with no warning. Pilot's did what they were supposed to do, recognize the problem, take manual control and bring her down, safely and quickly.
CaseyGa1991
(Duplicate Squawk Submitted)

Alaska Air Scare Due to Mechanical Malfunction

Passengers flying from Ontario, Calif., to Seattle today said a chorus of angry infants was their first clue of a problem aboard Alaska Airlines flight 539.

In the cockpit, pilots sent an emergency call from 25,000 feet to Federal Aviation Administration controllers, asking for priority landing at San Jose Airport. They told controllers that they were in the midst of a "catastrophic electrical failure with loss of some flight controls and cabin pressure."

http://abcnews.go.com/US/alaska-air-scare-due-mechanical-malfunction-triggered-shutdown/story?id=16962482#.UCMwEaGPWJo
bovineone
Jeff Lawson 1
Flight track for ASA539 -- http://flightaware.com/live/flight/ASA539/history/20120808/1330Z/KONT/KSEA
rick737
richard weiss 1
Seems to be a lot of arm chair NTSBing here. There's not one detail published and a few guys seems to have all the answers.
evbutler
Ev Butler 1
jannat apa, I don't like to read spam on this site. OK?

I'm sure that I speak for all who love aviation.
preacher1
preacher1 1
I think FA got him
ToddBaldwin3
ToddBaldwin3 1
It would be nice of the editors knew the difference between censor and sensor.
mschacht44
Mike Schacht 1
http://www.keprtv.com/news/local/Flight-to-Seattle-diverted-after-mid-air-decompression-165429946.html
s80pilot
Bruce Bower 1
Not only did they not know how to spell sensor but their expert thought that somehow it would close the throttles. It has no effect on the throttles.
AccessAir
AccessAir 1
Alaska cutting corners again??? Didnt they learn from AS 226 and their jack screw problem???
mschacht44
Mike Schacht 2
Yeah, no kidding. Notice they have been in the news lately.

http://www.cnn.com/2012/08/08/travel/alaska-airlines-wing-damage-note/?hpt=tr_c2

Yes, the plane can fly with a small chunk missing, but still this is half-assed maintenance if you ask me.
mschacht44
Mike Schacht 2
Interesting

Alaska spokesperson Paul McElroy said the problem stemmed from the air/ground sensor, which is designed to tell the plane whether it's on the ground or in the air.

When the sensor malfunctioned at 25,000 feet, the plane thought it was on the ground and turned off the automatic flight controls, McElroy said. But pilots were able to immediately take over manual control and there was no loss of altitude or speed.

The sensor also turned off the cabin pressurization, assuming the plane was on the ground, but a back-up system kicked in immediately and oxygen masks didn't need to be deployed, McElroy said.
sparkie624
sparkie624 1
That sounds plausible for the pressurization... What I do not understand is what happened to the Electrical. There are 2 totally separate independent electrical systems... Both engines have generators, controlled separately and independently. Why would both kick off line at the same time, and that IS NOT controlled by the PSEU )Proximity Switching Electronics Unit) that receives data from the Flight Ground Indications. There is a lot of Key Information missing here. I would not be surprised to see Pilot Error somewhere in this.
rick737
richard weiss 2
Pilot error is not likely. The pressure controller on that aircraft doesn't have an air/ground switch. The cruise altitude and the landing airport altitiude are the only two settings. My GUESS is the failure of the air/ground safety sensor switch on the MLG, told the aircraft it was on the ground and opened the outflow valve. It's been a long time since flying the 737, but I do remember a lot of stuff was controlled by those sensors
preacher1
preacher1 2
There is another article over under "NEW SQUAWKS", at least it was, in which the airline did issue a statement and it pretty much laid it on that sensor. As far as pilot error, I don't see how, as they took immediate manual control, and put the thing down. A sensor can go bad at anytime, even right after mx, with no warning. You can't fault anybody here, Airline, pilot's or mx.
sparkie624
sparkie624 1
I have worked 737 2,3,4,5,& NG series a/c. Too lose the Transponders and Pressurization with the statement of "catastrophic electrical" it may be a MLG Switch, but it is going to be more. The company in there statement left out some facts they would prefer not to answer.
preacher1
preacher1 3
Probably so but the fact remains that the pilots got ahold of it and got it down safely and quickly
sparkie624
sparkie624 1
I agree... Any landing that does not require Emergency Personnel to remove you from the plane is a good landing in my book... However, I have been some planes where I wondered if we crashed or landed.... Never got a bold enough to ask the Capt which it was :)
preacher1
preacher1 2
sparkie624
sparkie624 1
It could be 2 different problems, but note the statment: "catastrophic electrical failure" including the loss of transponders. " If he had that much of a catastrophic failures, it is more than a Prox Sense issue.

[This poster has been suspended.]

rick737
richard weiss 1
What a great country. Even Phil Rudd has the right to make himself look like village idiot. congrats, Phil.
sparkie624
sparkie624 1
Ditto

[This poster has been suspended.]

rick737
richard weiss 1
That's interesting. I worked in the commercial airline flying business for 30 years. Not once did I encounter a culture of ignorance about safety. My very last job, after forced age sixty retirement taught me that what you are saying could happen. Guess what, they got run out of business for that attitude. The FAA did their job.
MHarryE
I cannot understand your comment about no concern for safety. Lockerbie, Scotland, marked the beginning of the end for PanAm. TWA's 747 crash departing New York began their demise. Douglas Commercial had problems that were resolved by a McDonnell takeover, but even that couldn't carry the DC-10 problems so although they came through and fixed the plane so it ended up being very safe, they lost their market because of customers avoilding. Also note that some of the first responders are the people with spray paint to paint out the markings on a hull. Even the stolen CRJ a few weeks back had its Delta markings quickly painted out. Eoday every incident affects passenger load.
preacher1
preacher1 2
So what is your point? You kinda ramble and hit everything from a merger to a bomb.
THRUSTT
THRUSTT 1
Getting cranky in your golden years there Preacherman...
preacher1
preacher1 2
I've earned it.LOL
sparkie624
sparkie624 1
In some airlines, I would agree. I have been in the airline industry working part 121 and I have only encountered one airline with that attitude. I know myself, I work for a regional carrier as a A/C MTC Controller. If I am not happy with the plane, I AM NOT GOING TO LET IT GO UNTIL I AM HAPPY WITH IT... PERIOD. I had a captain who wanted to take a plane, said he could get it back to a maintenance base. I told him NO! It is staying where it is at and I am road tripping Mechanics and Parts. I have Worked Mtc Control at 2 different airlines, and NO, I do not agree with your broad statement on that Phil. There are things that we can fly with that are broken. We have backups... I will defer a wing anti ice caution on a nice clear day, but not with weather... Same thing for Radar, Window Heat, Etc. If a light bulb is burnt out in your reading light, so what, read in the DARK... That is not a safety of flight, however, if the Emergency Lights are INOP, you are not going. I hear being preached from Higher Ups... Keep them flying SAFE! I had an issue that I felt strongly about and I had it fixed. Even though I could have legally defered the item, I chose to fix it because I did not fee comfortable about it. talked to my boss and he said he would back me on it.... You are right.... Safety is Expensive... And we pay for it every day... When you are on a plane, don't grumble about delays at the end of the runway... They may be talking to me while we fix the plane over the phone.
ToddBaldwin3
ToddBaldwin3 1
Well said!
THRUSTT
THRUSTT 1
He is right though about the public getting what they want to pay for...

[This poster has been suspended.]

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