Guest bianchiboy Posted September 17, 2003 Share Posted September 17, 2003 Hey all, I'm just working my way through the Vol 2 (systems) manual, and I can't find what the deceleration rates are for the 737-200 autobraking system, MIN-MED-MAX? I don't have any other manuals yet, so I don't know if it's a published thing, though it's certainly not in Vol 2. Also, is it a decent system in practical use, or more of a "we never use that" thing? Thanks in advance, BB Link to comment Share on other sites More sharing options...
Mitch Cronin Posted September 17, 2003 Share Posted September 17, 2003 We don't have autobrake on ours (which I guess tells you what some think of it), so I have nothing in my books, but from this site: http://www.b737.org.uk/hawk737200notespart4.htm#ATA%20CHAPTER%2032%20[LANDING%20GEARS] it says: THREE DECELERATION RATES IN AUTOBRAKE MODE ARE:- MIN 4 FT/SEC2 MED 7 FT/SEC2,6 FT/SEC2 MAX 10 FT/SEC2 Link to comment Share on other sites More sharing options...
Guest bianchiboy Posted September 17, 2003 Share Posted September 17, 2003 Thanks Mitch, that looks like an interesting site. Do you have any other links like that for the -200? Link to comment Share on other sites More sharing options...
Mitch Cronin Posted September 17, 2003 Share Posted September 17, 2003 That's the only one I've saved, but I'm pretty sure a few selective searches on Google could turn out some results. Link to comment Share on other sites More sharing options...
Ex 9A Guy Posted September 17, 2003 Share Posted September 17, 2003 Sorry can't help, at WestJet all the -200s have the autobrake system permantly disabled. The -700 uses autobrake but since I am still driving the venerable old Truckasaurous Rex I can't be of much help. Cheers Link to comment Share on other sites More sharing options...
Guest Sawbones Posted September 18, 2003 Share Posted September 18, 2003 With over 8,000 hours on the 737-200, I can't say that I used the autobrake system regularly. It is important to remember that the deceleration rates that are quoted by Mitch are no doubt accurate, but the system doesn't recognize where the deceleration is coming from ... brakes or reverse thrust. In other words, if the selected deceleration rate is being achieved by reverse thrust, the brakes won't come on at all. Hence, a frequent line indoc question would be ... how do you achieve max deceleration on a slippery runway? Answer: max auto brake, max reverse on touchdown, then max manual wheel braking so as to achieve max reverse and max braking. The auto brake is great for getting the binders on as soon as you touch before you can get your feet off the rudders and onto the brakes. In practice, medium autobrake would be the selection of choice on a slippery, short runway. Max is very harsh (maybe you shouldn't be here if you think you need it) ... and all this after many years of 5,000-6,000' runway landings in the Maritimes. Cheers Link to comment Share on other sites More sharing options...
Guest bianchiboy Posted September 18, 2003 Share Posted September 18, 2003 Well, that answers my question then, it's moot since I won't be using it... (hope to see you on the line, though you probably guessed as much... double ) Link to comment Share on other sites More sharing options...
Guest bianchiboy Posted September 18, 2003 Share Posted September 18, 2003 Thanks for your input Sawbones. As with all aircraft, one relies on the experience of people who have flown the bird, rather than what the manual dictates. The way the system on the -200 works sounds standard, for example, on the A310 it was the same, deceleration was measured absolutely, (i.e. if you were on "LO" and you were doing 4 m/s^2 (to my best recollection) decel with reverse, the brakes wouldn't come on). On the 310, we never used more than "Lo" (or as Boeing calls it "MIN"), for a normal landing, if at all. "MAX" was ONLY set as a pre-takeoff setting, in case of a reject. It would pretty much guarantee a full-on whiplash, since it was a "threshold braking to the anti-skid" setting. Link to comment Share on other sites More sharing options...
Guest bianchiboy Posted September 18, 2003 Share Posted September 18, 2003 don't know why the winky thing got in there... Link to comment Share on other sites More sharing options...
Ex 9A Guy Posted September 18, 2003 Share Posted September 18, 2003 Welcome aboard, when do you start?? I knew we had a fall -200 course but hadn't heard when it started. Cheers Link to comment Share on other sites More sharing options...
Guest bianchiboy Posted September 19, 2003 Share Posted September 19, 2003 Thanks, October 6. Really looking forward to it. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.