• two Master Caution Lights (MCL)
• two CAS RST pushbuttons
• four Input/Output modules, part of MAU 1 and MAU 2
• one Aural Warning Generator (AWG), part of MAU 2
MONITOR WARNING FUNCTION (MWF)
The MWF is software running in the NIC/PROC module of each MAU that
monitors continuously the aircraft systems and determines what alerts and
advisories must be triggered and provided to the pilots.
MASTER WARNING LIGHTS (MWL)
Two red Master Warning Lights are installed in front of the PLT and CPLT
seats. When a warning occurs, the MWLs start to flash until any pilot resets
by either pressing his MWL or his CAS RST pushbutton.
MASTER CAUTION LIGHTS (MCL)
Two amber Master Caution Lights are installed in front of the PLT and CPLT
seats. When a caution occurs, the MCLs start to flash until any pilot resets
by either pressing his MCL or his CAS RST pushbutton.
CAS RST PUSHBUTTON
A CAS RST (CAS Reset) pushbutton is provided on each Collective Lever to
reset both MWLs and MCLs.
MAU INPUT/OUTPUT MODULES
The Control Input/Output (CIO) module and the Custom Input/Output (CSIO)
module of both MAUs receive the input signals from all aircraft system
sensors and drive the Master Warning Lights and the Master Caution Lights.
AURAL WARNING GENERATOR (AWG)
The Aural Warning Generator (AWG) supplies tones and aural messages
(tones and voice) to alert pilots about possible dangerous conditions.
The CIO module of MAU 2 contains the AWG circuitry and supplies the aural
warning output to the audio panels.
The AWG is controlled by the MWF software.
CWS – PRINCIPLE OF OPERATION
Each MWF generates a list of active messages (CAS List 1 in MAU 1 and
CAS List 2 in MAU 2). In normal conditions, the CAS window in each MFD
(or on a DU in Composite format) shows the messages generated by MAU
2, i.e. CAS List 2.
Messages are grouped with the following priorities and formats and are
identified by their color:
• Priority 1.................................................................. WARNING
• Priority 2 ................................................................. CAUTION
• Priority 3 ................................................................. ADVISORY
• Priority 4 ................................................................. STATUS
The CAS window has 12 lines, 18 characters long.
The end of the message stack is indicated by the END line in white normal
video.
Warning messages are shown at the top of the list (top priority) and cannot
be scrolled. When a new warning message is activated, it is displayed in red
reverse video (white text on red background) until it is acknowledged. After
acknowledgement it is displayed in red normal video.
When a new caution message is activated, it is displayed as amber reverse
video (black text on amber background) until it is acknowledged. After
acknowledgement it is displayed in amber normal video.
When a new advisory message is activated it is displayed as green reverse
video (black text on green background) for 5 seconds from when it is
displayed in the CAS window, then it automatically changes into green
normal video.
Status messages are shown in white normal video and most of them are
only displayed when the helicopter is on the ground