The "APU" on a Lear 60 is nothing more than a jet fuel powered battery charger. What an embarrissment.
Cooling is by freon air conditioning.
As the Lear 60 is "grandfathered" on the original Lear 24 TC (as are the 25, 28, 29, 31, 35, 36, and 55) the systems are archaic and maintenance access is poor.
If you are currently operating a G4, you will find LR60 approach speeds similar (~130kts at minimum weights). The brakes do work - but look at those little tires !
Extreamly important to service tire pressures before leaving home base and keep a good eye on them.
I last operated s/n 316 and it had fuel quantity indicating system problems that even the factory couldn't figure out.
Try not to laugh out loud when they show you how to service the potty (good for
7 flushes). Another embarrissment.
While the plane may be certified to 510, it's really a 390/400/410 airplane.
C2j