I saw recently a video at flightlevel350.com.(http://www.flightlevel350.com/viewer.php?id=4148)
The video showed a rj100 of SNBA taking off at Prague/Ruyzine
I saw, before the plane speed up, that the speedbrakes were deployed... Do you know why the speedbrack are deployed BEFORE the take off?
yes that was I tough but i wanted the confirmation
I was on a flight SNBA from Copenhague(RJ100) and, after the landing the captain didn't retract the speedbrake. the speedbrakes were retracted just before engine's shutdown at the gate ...
Do you know why?
It's just a pre-flight test. They're testing the liftspoilers!
Some information about the liftspoilers on the Avro:
Each wing had three lift spoilers mounted on its upper surface for use on the ground during the landing run or for a rejected take off. The yellow system powers the inner lift spoiler, while the green system powers the middle and outer lift spoilers - which are also mechanically internconnected. Spoiler deployment therefore remains symmetrical if one hydraulic system fails. the lift spoilers each have a seperate jack with a lock mechanisme to retain the spoiler in the retracted position should the hydraulic power fail. A configuration warning is given on the ground, if any lift spoiler jack is unlocked and any thrust lever is moved into take-off regime.
The system governing the lift spoilers provides automatic deployment once the aircraft had landed. The spoilers are hydraulically powered and electrically signalled and can be operated in two ways:
* Manually, by moving the dual pupose airbrake/lift spoiler selector lever.
* Automatically, by using the autospoiler system controlled from the flightdeck overhead panel.
The system is prohibited from operation in flight. In the manually mode the spoiler system requires signals from the thrust lever position microswitches and the weight on wheels system before deployment. In automatic mode additional speed signals are required from the wheel speed sensors which form part of the anti-skid system.
On completion of the landing run, the spoilers will close automatically when the aircrafts ground speed drops below 15 kts when in the automatic mode. Alternatively they can be closed manually ( by the lever).
During a touch-and go situation, the spoilers would automatically retract when any two thrust levers are advanced above flight idle.
