Instructions: Activation group 7 plus Trim up to open rear door, activation group 5 VTOL up for flaps, Activation group 6 plus brake for reversers, and activation groups 1 through 4 and 8 for lights.

Thanks to @BaconEggs for helping with the flaps!

History on the 727:
The Boeing 727 is a midsized, narrow-body three-engined jet aircraft built by Boeing Commercial Airplanes from the early 1960s to 1984.It can carry 149 to 189 passengers and later models can fly up to 2,700 nautical miles (5,000 km) nonstop. Intended for short and medium-length flights, the 727 can use relatively short runways at smaller airports. It has three Pratt & Whitney JT8D engines below the T-tail, one on each side of the rear fuselage with a center engine that connects through an S-duct to an inlet at the base of the fin. The 727 is Boeing's only trijet aircraft. ( /\ From Wikipedia /)

Notes:
(mainly about how to put the plane into a spin because why not? and what happens if you have reversers on when you taxi)
I would recommend only using reversers on landing, I would again suggest you turn them off once you get to 30mph. If you keep using them for when you taxi, it may tip back on to the tail and get stuck in that position if brakes are used for to long, this is an easy problem to solve, just open the rear door.
When using trim at lower speeds, it dose like to spin or stall when more than half trim is applied at speeds slower than 175mph, I recommend using less than half trim at lower speeds like that. If wanting to do a spin, you must be at 3,000ft above ground/ocean, then you go to under 180mph, apply full trim, and keep it at about 10° nose high, and let it roll to on side or the other, keep trim and elevators at full, and it should do about a 180° Or so turn before rolling completely and entering a spin. Getting out of the spin is pretty easy, trim and elevators to neutral, full power, rudder opposite of the spin, and that should bring it out of a spin into a relatively steep dive, and then you just pull up from that with out using trim, and don't use trim until you pass 165 or 180mph unless you want to keep doing spins and or stalls, again this takes about 3,500ft to 2,500ft to recover from the spin.( and if you do spin under 2,500ft you will probably hit the ground, or the ocean and It shouldn't go into a unrecoverable flat spin, well at least I haven't been able to get it into a flat spin) (Tests were done at 3,000ft through to 30,000ft and on high physics, the speeds listed may differ a bit, and it is possible to fly with more than full trim at lower speeds, it just tends to pitch up stall and spin more often than when at higher speeds, and you can do a spin at high speeds if full elevator and trim are applied at once really quickly, it dosen't do those sort of spins that often but it can do spins that way as well.)