I've been trying to determinar what the acronyms on the throttle quandrant refer to. I know that T/O is the 'take-off' setting and that MCR is max. setting when between 15000 - 30000 ft. with anti-ice on, but what about MCT and APR? Usually APR stands for 'approach' but that seems to spool up the engines to max RPM's. Instructions on flying this plane allow one to get up in the air but not landing it (as far as throttle settings are concerned). Any help would be deeply appreciated. (See attachment)

MCT=Maximum Continuous Thrust.I'm guessing that APR is to reduce the throttle to Approach speed, as you've stated, but you do have to remember one thing: if you have Indicated Air Speed Hold active and, by moving the quadrant to APR, it causes the IAS to fall below the IAS Hold speed, it will rev up the engine to go back up to that IAS Hold speed.For example, if you have the IAS Hold to 200 Knots and by putting the Throttle Quadrant in the APR position, it causes the Airspeed to fall below 200 knots, the IAS will rev up the engine to get back up to 200 knots.Another thing to remember about some of the Autopilots (particularly in this Learjet) is that even though you've turned off the Autopilot the IAS Hold is NOT disengaged. You will have to do that manually.

Thanks Steven, that does help. If 'MCT' is Maximum Continuos Thrust, What does "MCR" stand for?

While I'm at it, there are a few other acronyms that I don't understand on this panel, e.g. (figured out 'VS'="vertical speed") but what is 'MCH' just right of the 'back course' button? And, what does it do?

MCH is used to tell the autopilot to hold the mach speed. Usually if you fly above anywhere above 25,000 feet, you start to use the MACH speed instead of KNOTS.Notice that if you press that button, the number changes to a decimal number (for example .77). This is telling the autopilot to hold the airspeed at mach .77.I'm not sure what MCR stands for. I believe it stands for Maximum Cruise.

I believe that MCR is Max Cruise Thrust. As for the APR, since it is all the way forward on the throttle quadrant, I would guess it is not an approach setting, even during single engine operations.Terry

Thanks Steve. I did figure out the MCH button earlier. Maybe a Lear expert can help on what APR & MCR really stand for.Jim :-hmmm

Basically, the learjet works by putting the levers into certain detents.APR--that is MAXIMUM power. This is not a normal power setting, but more of an emergency one.TO/GA--This is the takeoff/go-around detent, it is not MAXIMUM power because that wears the engines down too much, unlike a Cessna where you give it full power, the jets are able to take off with something between 85-90's.MCT--Maximum Continus Thrust, this is the climb detentMCR--Cruise DetentIdle/Reverse/Cutoff are self explanitory.EDIT: HOpe that helps--and i noticed you found the answer from a Lear pilot---awesome!