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View Full Version : a340-600 autobrake controls



gchad
02-08-2005, 03:36 PM
Why does the A340-600/500 have a little knob next to the autobrake controls and only 2 buttons whereas the A340-300/200 has 3 buttons (low, med and high)? What is the difference

A340-600/500 http://www.airliners.net/open.file?id=760071&WxsIERv=Nveohf%20N340-642&WdsYXMg=Yhsgunafn&QtODMg=Funatunv%20-%20Chqbat%20Vagreangvbany%20%28CIT%20%2F%20MFCQ%29&ERDLTkt=Puvan&ktODMp=Abirzore%2025%2C%202004&BP=0&WNEb25u=Nvefancf%20-%20NveyvarfBaCevag&xsIERvdWdsY=Q-NVUS&MgTUQtODMgKE=Ba%20fgnaq%20nsgre%20syvtug%20YU726%20sebz%20Zhavpu.%20Fcrpvny%20gunaxf%20gb%20gur%20YU%20perj%20sbe%20gurve%20crezvffvba%20gb%20cubgbtencu%20gur%20syvtugqrpx.%20%5BPnaba%2020Q%20VFB%20800%2028-300zz%201%2F20%20s3.5%5D&YXMgTUQtODMgKERD=7741&NEb25uZWxs=2005-01-19&ODJ9dvCE=&O89Dcjdg=543&static=yes&sok=JURER%20%20%28nvepensg_trarevp%20%3D%20%27Nveohf%20N340-600%27%29%20%20BEQRE%20OL%20cubgb_vq%20QRFP&photo_nr=2&tbl=COCKPIT

A340-300/200
http://www.airliners.net/open.file?id=747745&size=L&sok=JURER%20%20%28nvepensg_trarevp%20%3D%20%27Nveohf%20N340-300%27%29%20%20BEQRE%20OL%20cubgb_vq%20QRFP&photo_nr=5

jcmissionary
02-08-2005, 03:50 PM
Please, please, PLEASE, people, let's use the links kindly provided by airliners.net for linking to their pictures. It prevents having to enter in an insanely long URL for their pictures.

http://www.airliners.net/open.file/760071/M/

http://www.airliners.net/open.file/747745/L/

See? Here's those 2 pictures with much shorter URL's. :-wave

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PPL-ASEL
Instrument Rated
CPL student

"As employees, pilots are a difficult lot. They are masters of their vessels, answerable to no one for as long as the engines are running. Airline presidents have the power to control entire fleets, to decide where and when every plane shall fly. But once those decisions are made, no one tells the pilot how, or even whether, to fly."

gchad
02-08-2005, 04:13 PM
Sorry I didn't know I could get shorter URL's. Guess I should be more observant, thanks for pointing that out to me.

gdustin
02-08-2005, 08:32 PM
I'm not sure, but I noticed the gravity extension for the gears. How does that work? Is it what it sounds like - which would be opening the doors and letting the gears fall?

jcmissionary
02-08-2005, 11:42 PM
It would be used if for some reason the gear was stuck. The hydraulic pressure keeping the gear up would be released, and gravity would pull the gear down. We have a similar system on the Piper Arrow I fly.

[link:www.dreamfleet2000.com|http://www.dreamfleet2000.com/gfx/images/Forum_Banners/DF_BANNER_FORUM_HOWELL.jpg]
PPL-ASEL
Instrument Rated
CPL student

"As employees, pilots are a difficult lot. They are masters of their vessels, answerable to no one for as long as the engines are running. Airline presidents have the power to control entire fleets, to decide where and when every plane shall fly. But once those decisions are made, no one tells the pilot how, or even whether, to fly."

Magdrop
02-09-2005, 06:59 AM
I'm not familiar with Airbus systems, so I can only make a few general points.

Landing gear assemblies are generally held up in the retracted position by hydraulic up locks. If these uplocks fail to operate normally there is usually a mechanism to release the hydraulic pressure, allowing gravity and airflow to open the doors and permit the gear legs to fall. In this configuration the doors will not close after the gear is extended.

Boeing autobrakes are set by a rotary knob, similar to the picture above. Settings are: RTO (for arming Rejected TakeOff mode),off or disarmed, 1,2,3,4 and Max. Landing settings will vary with landing weight, wind and runway length. Settings 2 and 3 cope with most normal situations, with 4 and max being reserved for short or contaminated runways. Passengers may find settings 4 and max a little uncomfortable.