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Looking through the systems manual came across the spoiler slip clutch. But I cannot find exactly the information I am looking for regarding that.
What is the spoiler slip clutch exactly for anyways? What is the purpose? Is it to prevent more then 7lbs of pressure being exerted to prevent from damaging maybe the actuator or something?
Also,
When you have a Roll Spoiler Actuator Jam, do the controls get jammed completely? Or just at a certain point? For example do they get jammed and you cant move them unless you apply more then 7lbs of pressure, but then they just break free and don't do anything anyways? Or do they get jammed for example at the 10deg. left position only, and you can't turn them more, and if you try, and exert more then 7lbs of force, it will break free and go beyond that 10deg. but it will not be doing anything? Went over this in ground and I understood it, but its been a while and im confused again.
Thanks for any help. I'll make this my DHC-8 questions thread while I await the begining of SIM.
I'm not a real systems guy, so I'm sure there are other Dash drivers out there who can better answer your questions. Here at Mesa, the saying is "your captain spoils your day", so you (FO) have the ailerons, the Captain the spoilers when it comes to a roll control malfunction. If this is the case, then neither yoke will turn until the Roll/Disconnect handle is turned 90 degress and pulled out. This mechanism that allows one of the control yokes to be free in an aileron or spoiler jam scenario is in fact a clutch mechanism. If you were to pull it out in flight, you could push it back in and turn it back to where it was, this would re-engage the clutch mechanism and allow the flight controls to return to where they were. So if you have a roll control jam, pull the Roll/Disc. handle and you, the FO, have roll control of the airplane, then the captain must have had a spoiler jam and you are now turning the aircraft using ailerons. If the captain now has roll control, then he/she is turning the airplane by means of the roll spoilers. There must have been an aileron jam.
With regard to your question about spoiler actuators, are you talking about a spoiler linkage jam? If this is the case, the airplane still turns, however it reacts sluggishly and does not have the normal sort of "feel". The aircraft will usually start to roll w/ no control wheel input. If it is a linkage jam, you will have an illumination of one of the spoiler lights near the FGC, you'll have to push the illuminated switch, this will de-power the spoiler causing it to fall flush w/ the wing and improving roll control.
The Duke - I wanted to PM you but I'm unable to yet. Was wondering if I could ask you some questions - I'm studying up for dash 8 ground school next month at Mesa.
The Duke - I wanted to PM you but I'm unable to yet. Was wondering if I could ask you some questions - I'm studying up for dash 8 ground school next month at Mesa.
(I'm still hopefully plowing ahead.)
I'm sorry but are you completely clueless as to what is going on at Mesa right now?? I'm trying to be nice here but how can you in good conscience be going to a regional that could very well be belly up next month? Please consider very carefully what you are about to do.
The roll spoiler clutch disconnects the control yoke from the roll spoiler actuator right at the actuator if it becomes jammed. When they jam, you will encounter resistance, obviously, and when you exert more than 7 lbs of force on the yoke, it will "pop out" allowing you to still fly the aircraft with the ailerons. However, when the yoke goes back to the same position that the roll spoilers are jammed at it will pop back in. It's easy to break out though.
So that should answer your second question. If you have a roll spoiler jam, you will encounter resistance, which when it exceeds 7 lbs, you will break free from the roll spoilers, flying on ailerons alone. In cases where the roll spoilers jam in a high deflection position and your yoke passes 50 degrees (I think) in order to maintain control, the roll spoiler press switches light up to prompt you to press them. When you do, they depressurize the roll spoilers, hopefully bringing them back down. Other than that, when you have an aileron jam, your control yoke freezes entirely and you must pull the roll disconnect and let the free side fly. So, in the sim, when the yoke freezes, make sure you use some force first before calling it a roll jam and pulling the disconnect, because a spoiler jam feels the same as an aileron jam until you use more than 7 lbs of force. Hopefully that helps.
What exactly is the "alternate feather" button for???
Alternate feather is just that, it allows us to feather the engine if it has not done so on its own after an engine failure. Unlike a jet, when we have a 13 foot prop hanging out on the wing our performance is dramatically decreased ;-)
Procedure is
Power Lever: Flight Idle
Condition Lever: Fuel Cutoff
Alternate feather switch select Feather
Fuel Off handle pull
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