HMU (PM CAN VETO)
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A
Accel/Decel fuel flow limiting prevents compressor stall and flameout.
C
Collective pitch compensation through the LDS. When collective is moved, Ng is reset for immediate Np response.
E
ECU Lockout. PAS override control w/ ECU inop. Pilot can bypass TQ motor inputs.
M
Meters fuel in response to PAS, LDS, ECU (TQ motor), & engine variables.
N
Ng Limiting. Limits MTA @ low temps.
O
Opens Vapor Vents for manual HMU priming, to remove air from HMU.
P
Pumps fuel at high pressure
T
Torque motor to trim Ng output. fine tune engine output. Override through Lockout.
V
Variable geometry positioning of the inlet guide vanes for optimum performance