knucklemaster
Posts: 1
Joined: Fri Nov 23, 2007 6:13 am

Worker Crushed When 747 Landing Gear Collapses

Fri Nov 23, 2007 6:33 am

Just came across this news on Azcentral.com.


http://www.azcentral.com/community/p...les/1122gr-workercrushed22-ON.html


Worker crushed when 747 landing gear collapses
Associated Press
Nov. 22, 2007 01:13 PM

A man working on a Boeing 747 at an airstrip near Marana was critically hurt when the landing gear collapsed and he was trapped under the plane, authorities said.

The worker was part of a crew disassembling the retired passenger jet at Pinal Airpark Wednesday, Pinal County Sheriff's spokesman Mike Minter said.

For unknown reasons, the landing gear suddenly retracted and the plane fell, trapping Stanley Nye in the gear compartment, Minter said.

He was eventually freed and taken to a Tucson hospital, where he was in critical condition.


I hope that he will be alright. What a story for the grandkids!
 
missourifarmer
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RE: Worker Crushed When 747 Landing Gear Collapses

Fri Nov 23, 2007 7:09 am

Dont landing gears "lock" into place? What would make a landing gear just collapse on a stationary aircraft?
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BR715-A1-30
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RE: Worker Crushed When 747 Landing Gear Collapses

Fri Nov 23, 2007 7:19 am



Quoting Missourifarmer (Reply 1):
Dont landing gears "lock" into place? What would make a landing gear just collapse on a stationary aircraft?

Honestly, the same thing that happens when any landing gear collapses. The locks may not actually lock into place, leaving the aircraft vulnerable to gear collapses. Hydraulic failures, any other sort of failure that may cause the gear to malfunction. It mentioned in the article that it was a retired plane being DISMANTLED, so it is possible that somebody or something may have taken a wrong step, and caused this. Let's wait until we hear more on the investigation though, before we start pointing fingers to Mr. Magoo for goofing off during the dismantling process.
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Bongodog1964
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RE: Worker Crushed When 747 Landing Gear Collapses

Fri Nov 23, 2007 9:48 am

If a plane is being dismantled, it is to all intents and purposes "dead"; no hydraulic pressure, no pneumatic pressure, no electrical power. Thus relying on any of its safety systems is a little careless. Even mechanical locks which rely on the planes positive pressure on its undercrriage could abe ffected by balance changes as equipment is removed. Thus if personnel are to work on the plane IMO jacking would be required. I have seen phtos of even 747's sitting on massive piles of pallets for this reason.
 
deltajet757
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RE: Worker Crushed When 747 Landing Gear Collapses

Fri Nov 23, 2007 7:09 pm

Is it possible someone could have pulled the gear pins out?

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mark5388916
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RE: Worker Crushed When 747 Landing Gear Collapses

Fri Nov 23, 2007 8:57 pm

I sure hope the poor guy is going to be okay!
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Skyweasy82
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Joined: Thu Jun 28, 2007 1:04 pm

RE: Worker Crushed When 747 Landing Gear Collapses

Fri Nov 23, 2007 9:26 pm

The guy was working on the gear, and he did pull the pin, also there was someone in the cockpit that pulled the gear lever up. This known so far from talks through the Tucson maintenance community.
 
Western727
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RE: Worker Crushed When 747 Landing Gear Collapses

Fri Nov 23, 2007 9:56 pm

Anyone know what aircraft was involved?
Jack @ AUS
 
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jetmech
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RE: Worker Crushed When 747 Landing Gear Collapses

Fri Nov 23, 2007 10:10 pm



Quoting Knucklemaster (Thread starter):

From the sounds of it, it must have been a nosegear collapse.

Quoting BR715-A1-30 (Reply 2):
The locks may not actually lock into place, leaving the aircraft vulnerable to gear collapses. Hydraulic failures, any other sort of failure that may cause the gear to malfunction.



Quoting Bongodog1964 (Reply 3):
If a plane is being dismantled, it is to all intents and purposes "dead"; no hydraulic pressure, no pneumatic pressure, no electrical power. Thus relying on any of its safety systems is a little careless. Even mechanical locks which rely on the planes positive pressure on its undercrriage could abe ffected by balance changes as equipment is removed.

The 747 landing gear does not rely on hydraulics for safety when deployed. The landing gear mechanically locks over-centre using springs and thus does not rely on hydraulic pressure to lock down.

Quoting Deltajet757 (Reply 4):
Is it possible someone could have pulled the gear pins out?

The mechanical locking of the 747 landing gear occurs automatically, removal of the gear pins will not by itself cause the gear to collapse. Pressurising the appropriate hydraulic systems (#1 and #4) on a 747, moving the gear lever to up, and not having the pins fitted would most likely cause the nose gear to collapse and also possibly cause the body gears to retract as well. The gear pins are a last line of defence for such a situation, and as general rule, we always fitted gear pins when the aircraft was towed, and if the ground time exceeded a certain number of hours.

Quoting Skyweasy82 (Reply 6):
The guy was working on the gear, and he did pull the pin, also there was someone in the cockpit that pulled the gear lever up.

If it was the nose-gear as it sounds, then at least #1 system hydraulics was available. The scenario stated above has happened many times before on different commercial types which has ended in nose gear collapse.

Regards, JetMech
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N68TLCaptain
Posts: 11
Joined: Sat Sep 08, 2007 2:38 pm

RE: Worker Crushed When 747 Landing Gear Collapses

Fri Nov 23, 2007 11:15 pm

Was this down at Evergreens place?
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Skyweasy82
Posts: 40
Joined: Thu Jun 28, 2007 1:04 pm

RE: Worker Crushed When 747 Landing Gear Collapses

Sat Nov 24, 2007 1:23 am

It was one of the outboard main gears left or right I dont know.

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