Fuel Flow fix:

The best information I can find gives the 727 a roughly 10,000 lbs/hour fuel burn. The default CS burns about 7,500 PPH. Find the following in aircraft.cfg

[GeneralEngineData]
engine_type= 1
Engine.0= -41.000, -8.960, 2.500
Engine.1= -48.000, 0.000, 2.500
Engine.2= -41.000, 8.960, 2.500
fuel_flow_scalar= 0.361
min_throttle_limit=-0.25
max_contrail_temperature = -30

Change the fuel flow scalar so the entry reads like this:

[GeneralEngineData]
engine_type= 1
Engine.0= -41.000, -8.960, 2.500
Engine.1= -48.000, 0.000, 2.500
Engine.2= -41.000, 8.960, 2.500
fuel_flow_scalar= 0.4344
min_throttle_limit=-0.25
max_contrail_temperature = -30