Thanks so much, I only fly in flight simulator but this answered a ton of questions. When would you ever use high idle, I don't really understand what's happening with low and high idle? Thanks again.
Low idle is 52% Ng, and high idle is 64% Ng. It isn't a "mixture" lever like in a piston, all it is doing is quite literally changing what Ng idle sits at (in much the same way as winding up the idle screw on a lawnmower). The reason for this is that the engine has to be able to go from idle to takeoff power within a certain timeframe, and at low idle it is not quite quick enough. So for flight, they give us high idle (Beechcraft call it flight idle, it's the same thing). They give us ground idle because it uses less fuel when taxiing around. Hope that helps!
Thanks! After shutdown, we wait until the fuel low pressure light illuminates (alternating with AUX FUEL PUMP ON), and then turn it off just before turning the battery master switch off.
You can, yes! However, because having the inertial separator open allows some air to escape, and therefore less power, then if we’re already at our torque limit during flight and shut the separator we can go over the torque limit. So we need of make sure the power is back below the torque limit before shutting it!
The popped ones that are collared are for the propeller deice that’s been removed, and also for a cineflex camera that used to be installed. The NO ELT placard has to be there if there is no fixed ELT. If that’s the case then here we need to carry a portable ELT for Part 135 operations, or any operation in a designated remote area. I hope that helps!
How does reverse work on the power lever? I assumed it would use the pitch control linkages, but just actuated from the power lever so u don’t have to move your hand?
It’s actually a separate control to the pitch lever itself, because that’s actuated by oil pressure. Essentially the reverse linkages on the power lever allow the angle to go past the fine pitch stops, and then further reverse spools up the engine to provide “more reverse”, but at the same angle. I hope that makes sense!
The low pitch stops in the Caravan and other PT6s aren’t physical low pitch stops. It’s hydraulic by oil trapped in the hub via the beta valve. The beta valve can be moved to either let high pressure oil in from the governor pump or let it drain into the case via the combination of two things.. the reversing linkage and the feedback ring which both act on the beta arm like a teeter totter with the beta valve in the middle. The reversing linkage is controlled by the reversing cam which does nothing as the power lever is moved in the forward range but engages as the power lever is brought into the beta range. It pulls the beta linkage and opens the beta valve to add more oil to the hub.. and as the prop moves towards reverse the beta feedback moves to close the beta valve. This balancing act allows us to set the low pitch stop of the prop wherever we want to.
For some reason I find myself fascinated with the Caravan, thank you so much for the walkaround!
Thanks mate!
This is the most informative video I've seen yet on the Caravan. Education, with a side of snark: gotta love it.
Thanks mate! Haha, gotta love a bit of snark.
I just ferried VH-CFL out of the country.
Nice video m8.
Happy Landings,
Capt. Guido
Ah nice! That’s a survey machine I believe? Thanks!
Outstanding production 👍
Fab - it's become my favourite plane in MSFS
They're a great plane!
It’s my favourite plane IRL. The perfect combination of simplicity and capabilities.
Just got my first paid gig flying a 208 and this is really helpful! Great video.
Congratulations! That’s great to hear! They’re an amazing machine!
Great, informative video. Good first look overview! I'll watch it again for sure.
Thanks mate! I appreciate that.
Thank you
No probs!
Awesome video mate, please keep them coming!
Thanks mate! I appreciate the feedback!
You did a pretty good job on this video, thanks.
Thanks for the comment!
I ve watched this and the sart up vid about 20 times. thx for the cool videos
Great info! Make more vids on the caravan please!
Thanks! Ok, I'll be sure to get onto some Caravan videos again soon!
Great stuff, thanks for posting
Excellent, thank you!!!
great video thank you.
Thanks for the feedback!
Nice bird. 208b gc is my fav cessna.
Mine too!
Thank you and i love this video :)
You are best !
Thanks!
Very interesting walk-around.
Great video! Thank you. One question, why is the battery so expensive?
Thanks! I have no idea. However, have just replaced it and it was a touch over $5k AUD this time!
Thanks so much, I only fly in flight simulator but this answered a ton of questions. When would you ever use high idle, I don't really understand what's happening with low and high idle? Thanks again.
Low idle is 52% Ng, and high idle is 64% Ng. It isn't a "mixture" lever like in a piston, all it is doing is quite literally changing what Ng idle sits at (in much the same way as winding up the idle screw on a lawnmower). The reason for this is that the engine has to be able to go from idle to takeoff power within a certain timeframe, and at low idle it is not quite quick enough. So for flight, they give us high idle (Beechcraft call it flight idle, it's the same thing). They give us ground idle because it uses less fuel when taxiing around. Hope that helps!
Give us something about the different antennas
Lovely video when do you put off the fuel boost off after flight?
Thanks! After shutdown, we wait until the fuel low pressure light illuminates (alternating with AUX FUEL PUMP ON), and then turn it off just before turning the battery master switch off.
If you open the inertial separator on the ground, can you choose it later in flight?
You can, yes! However, because having the inertial separator open allows some air to escape, and therefore less power, then if we’re already at our torque limit during flight and shut the separator we can go over the torque limit. So we need of make sure the power is back below the torque limit before shutting it!
Could you explain more about the popped and covered CB's? Also how does the NO ELT work as per regs
The popped ones that are collared are for the propeller deice that’s been removed, and also for a cineflex camera that used to be installed. The NO ELT placard has to be there if there is no fixed ELT. If that’s the case then here we need to carry a portable ELT for Part 135 operations, or any operation in a designated remote area. I hope that helps!
@@aeroplanetoby Great, thanks for sharing!
How does reverse work on the power lever? I assumed it would use the pitch control linkages, but just actuated from the power lever so u don’t have to move your hand?
It’s actually a separate control to the pitch lever itself, because that’s actuated by oil pressure. Essentially the reverse linkages on the power lever allow the angle to go past the fine pitch stops, and then further reverse spools up the engine to provide “more reverse”, but at the same angle. I hope that makes sense!
The low pitch stops in the Caravan and other PT6s aren’t physical low pitch stops. It’s hydraulic by oil trapped in the hub via the beta valve.
The beta valve can be moved to either let high pressure oil in from the governor pump or let it drain into the case via the combination of two things.. the reversing linkage and the feedback ring which both act on the beta arm like a teeter totter with the beta valve in the middle.
The reversing linkage is controlled by the reversing cam which does nothing as the power lever is moved in the forward range but engages as the power lever is brought into the beta range. It pulls the beta linkage and opens the beta valve to add more oil to the hub.. and as the prop moves towards reverse the beta feedback moves to close the beta valve.
This balancing act allows us to set the low pitch stop of the prop wherever we want to.
I thought in the 208b there are 10 primary fuel nozzles and 4 secondary?
You are absolutely correct! Thanks for that, well spotted!
If anyone have short notes on c208B please contact me