PMDG 737 0.00.43
INTRODUCTION
For Simulator Use Only DO NOT DUPLICATE NOVEMBER 2022
Ground Service Vehicles:
• In addition to the static representation of ground connection carts
seen in our previous versions the 737 now has dynamic
animation of ground service vehicles:
o Ground power unit and external power pit
o Air conditioning and air start units driven in place by
tractors
o Galley service & cabin cleaning trucks
o Mobile air stairs
o Cargo belts
o Fuel pump truck
o Lavatory, potable water, and maintenance vehicles.
• All these are fully integrated to the aircraft (doors/cargo bays will
open in time, fuel truck will connect to under-wing refuel panel,
etc.) and will become alive either under the Automatic Ground
Operations feature or you can call any individual vehicle/service
manually whenever you need it.
Hydraulic System:
• Violating operating limitations on pumps will cause the case drain
fluid to overheat, resulting in an OVERHEAT warning.
• We have used realistic times for pumps to come online and drop
offline.
• Engine Driven Pumps (EDP) turn if the engine is turning. The
"pump switch" on the overhead is not actually turning the pump
on or off. Instead, this switch controls a solenoid that cuts off fluid
flow to the system respectively from the EDP. That solenoid is
held in the closed (off) position by DC power, so loss of that
associated DC bus will cause the solenoid to fail-open, thus
allowing the EDP to provide pressure to fluid on that side of the
airplane once again. This could be bad if you had that pump
disconnected for a reason!
• Overheat sensors in the Electric Motor Driven Pumps (EMDPs)
will trip pumps offline to protect them from overheat. It is
important to note that these are different sensors (and different
temperature ranges) than those that control the OVERHEAT
lights- so even when the overheat LIGHTS go out, you still may
not be able to activate the EMDP because for a while longer
while it is still cooling.
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