AVIONICS
HMM – Is the system designed to be single or dual? DuRall – The system is designed for single pilot operation and includes one FCC, two servos and one HeliSAS control panel (HCP) when interfaced to NAV radios and/or EFIS. HMM – How many channels does the HeliSAS have? DuRall – The HeliSAS is a two-channel system that is paralleled to the pitch and roll controls of the cyclic control stick.
HMM – Does the system have a fl ight director option? DuRall – A fl ight director is available when the HeliSAS is connected to the Genesys EFIS. HMM – With a fl ight director available, what lateral and
vertical modes does it have? How many can be active at a time? DuRall – The lateral modes include heading, VOR, localizer and GPS roll steering. The vertical modes include altitude hold, glideslope and localizer performance with vertical guidance (LPV), when interfaced to an appropriate NAV source. When interfaced to the Genesys EFIS, vertical steering is also included. Pre-selected operations can also
be enabled. For example, you can have the heading mode active with the localizer mode armed. Once the localizer deviation signal reaches a pre-determined value, the HeliSAS automatically captures the localizer and drops the heading mode. HMM – Can fl ight director modes be
fl own manually in SAS operation? DuRall – SAS is strictly a stability
mode. There is no need for fl ight director functions when in the SAS mode. Flight director modes become available when the autopilot is activated. HMM – What sensors does the HeliSAS require? DuRall – In the basic SAS
confi guration, the only external sensor is an attitude source. This can be an attitude gyro with autopilot pickoff s, or an attitude heading reference system (AHRS), or the Genesys air data attitude heading reference system (ADAHRS). To perform autopilot functions, a directional gyro and horizontal situation indicator (HSI), and a navigation source (NAV radio or EFIS) must be added to the mix. HMM – Do the sensor inputs have to
be digital?
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DuRall – No, the attitude source can be analog from an attitude indicator or a digital ARINC 429 input from an AHRS. The autopilot functions are designed to interface to the Bendix/King KI-525A HSI analog, or ARINC 429 digital input. Analog commands include heading datum, course datum, VOR left/right, localizer left/right, and glideslope up/down steering commands with fl ags. Digital commands include heading datum, course datum, VOR, localizer, glideslope, GPS roll-steering, and GPS pitch-steering commands when on an LPV approach. Additional GPS vertical steering is available when interfaced to the Genesys EFIS.
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