Re: airbrake question

In article <[EMAIL PROTECTED]>,
 [EMAIL PROTECTED] (WaltBJ) wrote:

>However, some, like the 727, say
>'no speed brake use with flaps extended' since loss of lift because of
>turbulence behind the s/b results in aero center shifting aft
>resulting in a marked nose-down reaction and loss of altitude. Not
>good on approach.

Actually that is because a loss of hydraulics with both s/b and flaps 
out leaves the s/b floating, still causing drag whereas if they were 
down, they would stay down for the most part.

There is very little pitch change with 727 speedbrakes even if you only 
deploy one set, ie the inboards only, or the outboards. So little that 
you can't use them to offset unwanted pitch like you can on a 707 or 135.

-- 
Ron