F-35 landing gear collapses after landing at Hill

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spazsinbad

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Unread post09 Jun 2020, 02:07

F-35 landing gear collapses after landing at Hill
08 Jun 2020 Stephen Losey

"The landing gear of an F-35 fighter collapsed after landing at Hill Air Force Base in Utah Monday, the base said in a statement. The F-35, assigned to the 388th Fighter Wing, had just finished what the base described as a routine training flight. The pilot left the aircraft and is having a routine medical evaluation, the base said.

Hill’s runway is now closed as a result of the landing gear collapse, and other Hill aircraft that were still in the air at the time have been diverted to other airports...."

Source: https://www.airforcetimes.com/news/your ... g-at-hill/
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notam123

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Unread post09 Jun 2020, 14:58

sh*t happens. But two crashes within 15 days.
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fang

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Unread post09 Jun 2020, 15:29

notam123 wrote:sh*t happens. But two crashes within 15 days.

Three events, the two you mentioned and the May 27th event in Fort Worth.
AS-22 made first flight, during take off had some issue with the nose wheel, the pilot aborted the flight and made emergency landing.
On the pic you can see the front doors of the main landing gear open, that's a sign of emergency landing
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IAF F-35i 933.jpg
pic by Dave Chng
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quicksilver

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Unread post09 Jun 2020, 16:40

“AS-22 made first flight, during take off had some issue with the nose wheel, the pilot aborted the flight and made emergency landing. On the pic you can see the front doors of the main landing gear open, that's a sign of emergency landing“

Huh?? According to whom? Which doors are we talking about?
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fang

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Unread post09 Jun 2020, 17:13

..
Last edited by fang on 09 Jun 2020, 17:57, edited 1 time in total.
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fang

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Unread post09 Jun 2020, 17:45

fang wrote:
quicksilver wrote:“AS-22 made first flight, during take off had some issue with the nose wheel, the pilot aborted the flight and made emergency landing. On the pic you can see the front doors of the main landing gear open, that's a sign of emergency landing“

Huh?? According to whom? Which doors are we talking about?

I know it and also the photographer mentioned it
https://www.facebook.com/photo?fbid=149 ... 5023712644

Normal landing with only rear doors of the main landing gear open (mnt 3:50)
https://www.youtube.com/watch?v=4LPEFZNAPqE

and now compare it with the pic
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IAF F-35i 933.jpg
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spazsinbad

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Unread post09 Jun 2020, 18:26

F-35A landing doors from video ScreenGrab at 3min 51sec from video link above then ZOOM of pic above showing doors.
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F-35AlandingScreenGrab.jpg
F-35AfrontRearLandingGearDoorsZOOM.jpg
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outlaw162

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Unread post09 Jun 2020, 20:05

I don't know if it's true of the F-35, but in the case of many aircraft with a hydraulic gear extension malfunction, when the alternate gear extension system (compressed air, gravity drop, even volume limited B/U STBY hydraulics) is used, it can affect gear door sequencing for those doors not physically attached to the gear itself. You could easily identify those aircraft during landing.

But in the case of the gear collapse, I don't know of an aircraft where an indication of '3 green' and no reds didn't indicate an over-center lock condition existed. (Did he have 3 green?) Although, in the F-105 you could actually get '3 green' and '3 red' at the same time with an obscure antiskid problem.

Who designs these things?
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quicksilver

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Unread post09 Jun 2020, 20:17

fang wrote:
fang wrote:
quicksilver wrote:“AS-22 made first flight, during take off had some issue with the nose wheel, the pilot aborted the flight and made emergency landing. On the pic you can see the front doors of the main landing gear open, that's a sign of emergency landing“

Huh?? According to whom? Which doors are we talking about?

I know it and also the photographer mentioned it
https://www.facebook.com/photo?fbid=149 ... 5023712644

Normal landing with only rear doors of the main landing gear open (mnt 3:50)
https://www.youtube.com/watch?v=4LPEFZNAPqE

and now compare it with the pic


Got it. Thx.
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fang

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Unread post09 Jun 2020, 21:28

To understand the function of these front doors, in normal flight they open and close automatically upon landing and taking off (mnt 2:25 in the video).
The pilot can't control them selectively .

Once the pilot initiate the emergency landing procedure, they open automatically and remain open just like AS-22 did.
The ground crew can open and close them for some maintenance processes (see picture).
On the ground when these doors are open it's impossible to start the engine and/or take off.
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F-35B.jpg
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outlaw162

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Unread post09 Jun 2020, 21:55

Correct me if I'm wrong, but they sure look like they'd be controlled normally by the cockpit landing gear handle....which would be pilot selectable, up or down.
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Dragon029

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Unread post11 Jun 2020, 10:04

As indicated in the posts further up, the doors he's talking about are only open briefly while the main landing gear swings up or down. When the gear is up obviously all the doors are closed, and when the gear is down, that forward panel closes to minimise drag and noise. The only way the pilot could maybe manually keep that door open, with the landing gear handle, would be if they kept swinging it up and down.
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Unread post11 Jun 2020, 17:04

If one can be misinterpreted, one will be misinterpreted. :D

I never meant to imply that the pilot could manually hold open those doors with the gear handle, only that the pilot controls the gear handle which controls "normal" operation of those doors. Many aircraft have gear doors not attached to the gear structure itself that "sequence" when the gear handle is selected up or down and are open to make room while the gear are "in transit" to either the full up or full down and locked position as operated by the gear handle as actuated by the pilot. Sorry for the poor wording.

In fact though I don't actually even know if the F-35 has a cockpit gear handle. :D These days, maybe they're touch screen or voice activated up or down. But I would certainly assume that there is an alternate or emergency landing gear system of some sort in case of hydraulic or other failures, and when utilized it apparently takes hydraulic pressure off the forward gear door before it sequences back up after gear extension. Common to many aircraft.

Also in fact, of note there are some aircraft with a three position gear handle, UP, DOWN or OFF. With such a system like this which takes hydraulic pressure off the whole landing gear system in the OFF position, you can stop the all the gear and door sequencing at any intermediate position by selecting off.

Main thing is to have 'em down and locked for landing so it doesn't take full power to taxi. :mrgreen:
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usafr

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Unread post11 Jun 2020, 18:39

The F-35 does have a physical gear handle. It is just to the left of the Panoramic Cockpit Display screen.
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spazsinbad

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Unread post11 Jun 2020, 21:37

A spew inducing tour of the F-35A cockpit with the landing gear handle in view along with any switch fiddling ad nauseam.

PHOTOs: http://www.fujitsu.com/downloads/MICRO/ ... 1-2330.pdf (0.8Mb)

http://www.codeonemagazine.com/images/m ... 7_9967.JPG

Someone Lit the LAMP: http://www.codeonemagazine.com/images/m ... 7_9142.JPG

F-35 Lightning II Cockpit - What It Looks Like From Inside https://www.youtube.com/watch?v=hx-TsY4R-1I

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F-35cockpitGEARhandleDOWN.jpg
F-35gearHandleLowerLeft.jpg
F-35landingGearHandleLightON.jpg
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