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How Do You Control The Ground Spoilers?  
User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Posted (12 years 12 months 4 days 2 hours ago) and read 5454 times:

Hi everyone. I would just like to know if there is a different stick used to activate the ground spoilers, or if the same speed brake handle is used. If they are the same, what determines when to deploy ground spoilers and when the speed brakes (or both at a time)?

I have known that quick descents are not uncommon, and that high descent rates can be achieved by the aircraft. I wanted to know if there are any limitations due to pressurization issues as to the descent speed. I once went into a 767 flight deck and noticed the VS pointing to the -4500 fpm, which I thought was rather high. Is it really?

Thanks in advance everyone.


7 replies: All unread, jump to last
User currently offlineSeiple From , joined Dec 1969, posts, RR:
Reply 1, posted (12 years 12 months 4 days 2 hours ago) and read 5439 times:

Regarding spoilers....

In flight, the flight spoilers are activated by the speed brake handle. I know that Boeings have a spoiler mixer that activates them in proportion to the ailerons for better roll control.
Ground spoilers will only activate on the ground. They require weight on wheels via a squat switch or something similar. When arming the spoilers, normally one set (flight or ground) will deploy with the squat switch activation while the other set requires some sort of power input (such as reverse thrust).

User currently offlineAvioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11
Reply 2, posted (12 years 12 months 4 days 1 hour ago) and read 5425 times:

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The ground spoilers are normally actuated using the spoiler handle. The handle is most normally located to the immediate left of the throttle levers. They may also be deployed on landing automatically through an electrical actuator connected to the control quadrant under the floor. On many aircraft there is an interlock so that the ground spoilers do not operate in flight or when the aircraft weight is not on the landing gear. The flight spoilers normally work through a mixing or proportioning mechanism to compliment the ailerons thus requiring less aileron deflection to achieve a higher roll rate. They deploy with the ground spoilers when the spoiler handle is pulled.

One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
User currently offlineAAR90 From United States of America, joined Jan 2000, 3560 posts, RR: 44
Reply 3, posted (12 years 12 months 3 days 22 hours ago) and read 5368 times:

Depends upon the aircraft. Most utilize a single "speedbrake" or "spoiler" handle. Some of those have a "flight" limit position and some do not. Those that do "normally" utilize some form of physical restriction to prohibit movement beyond the flight limit when no weight on wheels is sensed. Notice the use of "some" and "normally." Naturally there are exceptions. i.e. F-100 uses "Lift Dumpers" which are "armed" by the pilots and activate with weight on wheels sensing.

*NO CARRIER* -- A Naval Aviator's worst nightmare!
User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 4, posted (12 years 12 months 20 hours ago) and read 5261 times:

Thanks for answering my question everyone


User currently offlineRick767 From United Kingdom, joined Jan 2000, 2662 posts, RR: 50
Reply 5, posted (12 years 12 months 20 hours ago) and read 5255 times:

As AAR90 said, every aircraft is different and there will always be exceptions.

On the 767-300 for example, all six spoiler panels on each wing activate as both ground spoilers and roll control spoilers / speedbrakes..

On the 757, however, only the three outboard and two inboard spoilers act in this way, with all six operating on the ground.

In the latter case, the distiction between air and ground operation is achieved via the "air / ground logic system"

I used to love the smell of Jet-A in the morning...
User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 6, posted (12 years 12 months 18 hours ago) and read 5241 times:

Hi Rick767, thanks for responding. Since you fly the 767, do you know if there are any limits regarding descent rates? What would be considered a 'high' descent rate on the 767?
Thanks in advance


User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 25
Reply 7, posted (12 years 12 months 14 hours ago) and read 5215 times:

What would be considered a 'high' descent rate on the 767?

one where the flight attendants are pinned to the ceiling!!

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