AVIONICS
Controller (RI-553) The two remote instrument controllers allows selection of selected course, selected heading, and decision height (DH) set for both the pilot and co-pilot’s displays. It also allows for a radio altimeter self-test to be performed. The heading knob has a push direct feature and the course knob has a push sync feature.
RI-553
Display Controller (DC-840) The two display controllers are used to select information to be displayed on each PFD. This includes altitude preselect and the BARO setting. The data set on the PFDs is used by some of the FD modes to generate computer steering commands that can be hand flown by the flightcrew or coupled to the autopilot for hands-off flight.
Guidance Controller (GC-810) The guidance controller is used to select which flight director modes are being actively used, which modes are armed, and to select which PFD navigation source is being used by the flight director (pilot’s or co-pilot’s PFD).
DC-840
GC-810
Autopilot/Yaw Damper Linear Actuators (SM-7000) The muscle for the autopilot is in the form of flight control linear actuators. There are two each flight control linear actuators (smart servos) for the pitch, roll and yaw axes. They are mounted in a serial fashion in the mechanical flight control rigging for each axis. This allows the pilot to fly through the AFCS if need be, and also allows SAS inputs to aid the pilot when hand flying the aircraft. The linear actuators are called smart servos as the actuator drive signal is processed by a microprocessor in the actuator itself.
Linear Actuator
Pitch & Roll Linear Actuators
Yaw Linear Actuators
Communications Systems In the AW-139, the Honeywell communications package consists of dual VHF communication radios, a selective call (SELCAL) capability, a digital audio system and connections to the cockpit audio system. Links to the cockpit voice recorder (CVR) and cabin PA system are also provided. A high frequency (HF) is an available option and can be mounted as a standalone LRU in the aft avionics bay area. With the HF option, an antenna coupler and high-power amplifier are also required.
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