Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Speed Brake Lever ---- A310  
User currently offlinePopee From Pakistan, joined Feb 2001, 151 posts, RR: 0
Posted (8 years 8 months 1 day 6 hours ago) and read 3154 times:

Hi.

Can some one pl tell y the speed brake lever has detents ( eleven in number ) and not smooth like on Boeings ?

Does eleven detents also means that the spoilers hv same 11 discrete positions ??

Thanks.

Popee

3 replies: All unread, jump to last
 
User currently offlineJetlagged From United Kingdom, joined Jan 2005, 2556 posts, RR: 24
Reply 1, posted (8 years 8 months 1 day ago) and read 3085 times:

The Airbus A300/A310 speedbrake lever will return to the retracted position unless held in one of the detents. The number of detents allows the pilot to select and hold varying degrees of flight spoiler. On a Boeing the lever will stay where it is put, unless the speedbrake actuator is in operation. However the Boeing speedbrake does have detents: a flight detent and an armed detent.

Flight spoiler position is infinitely variable but since the flight spoilers follow the speedbrake lever position, there are in effect discrete positions. However, as airspeed increases the spoiler panels blow down with increasing dynamic pressure.



The glass isn't half empty, or half full, it's twice as big as it needs to be.
User currently offlinePopee From Pakistan, joined Feb 2001, 151 posts, RR: 0
Reply 2, posted (8 years 8 months 8 hours ago) and read 2997 times:

Hi Jetlagged.

Do u mean to say that notches r there to keep the lever in its place otherwise the lever is going to change its place ??

I think there r some other reasons than this, because there is no mechanical/aerodynamic load on lever as it gives an electrical signal only, to EFCU.

Popee.


User currently offlineJetlagged From United Kingdom, joined Jan 2005, 2556 posts, RR: 24
Reply 3, posted (8 years 8 months 5 hours ago) and read 2970 times:

Quoting Popee (Reply 2):
there is no mechanical/aerodynamic load on lever as it gives an electrical signal only, to EFCU.

That doesn't mean to say there is no mechanical load on the lever. For example, the throttles on an A320 only provide electrical signals, but still have a mechanical loading system (friction, detents, etc). The speedbrake detents are there simply to give a positive positioning of the lever, allowing the pilot to release the handle, knowing it will stay in place.

The Boeing design uses friction to keep the speedbrake lever in place, connected via a lost motion device to the automatic actuator. Airbus uses mechanical detents to keep the speedbrake in place (just like Douglas on the DC-9/MD80). For ground spoiler deployment the whole speedbrake assembly moves, detents and all (from memory, it's a while since I was in an A310 cockpit).



The glass isn't half empty, or half full, it's twice as big as it needs to be.
Top Of Page
Forum Index

Reply To This Topic Speed Brake Lever ---- A310
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
Auto Speed Brake Actuator On B737 posted Mon Nov 15 2004 19:21:12 by MaerskMech
Fokker 70/100 Tail Speed Brake posted Sun May 4 2003 16:05:01 by Panther
Park Brake Lever posted Sun Dec 9 2001 23:36:20 by 747-400buff
DC-8 Maximum Speed posted Fri Nov 3 2006 23:07:18 by Blackbird
Cooling Down A Brake After Takeoff? posted Mon Sep 18 2006 13:20:19 by EBGflyer
Speed Of Air Out Of The GE-90-115's Back End posted Sun Sep 10 2006 01:47:24 by UAL747
Approach Speed & Cruising Height posted Tue Aug 29 2006 18:42:54 by HKA
Exhaust Gas Speed At Start-up posted Sat Aug 19 2006 00:25:26 by Hugh3306
Alpha Speed - Whats The History On The Name posted Wed Aug 16 2006 14:11:08 by HAWK21M
Tag Near Brake Indicator Pin posted Sun Aug 6 2006 10:44:34 by HAWK21M

Sponsor Message:
Printer friendly format