HMU (PM CAN VETO)

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