detent microswitch inside the Trim Actuator. FD remains coupled and no
change in FD settings occurs.
FD AURAL TONES
MODE CHANGE TONE
A chime sounds whenever any of the following occurs:
• Autopilot mode changes from ATT to SAS or vice versa
• A FD mode changes status from disengaged to engaged or vice versa
• A FD mode changes status from armed to captured
• Coupling status (CPL) changes from Coupled to Uncoupled or vice
versa
Arming of modes does not trigger the tone.
When a collective FD mode is engaged and coupled, the tone is triggered by
moving the CLTV/YAW TRIM switch to OFF.
ALTITUDE REFERENCE CHANGE TONE
An aural tone (“bip-bip”) sounds for any change in altitude or radar height
mode reference datum.
ALTITUDE ALERTER
When ALT (Altitude Holding) or RHT (Radar Height Holding) modes are
engaged, an aural warning message “ALTITUDE – ALTITUDE” is generated
whenever aircraft exceeds a predetermined altitude/height deviation.
FLIGHT DIRECTOR INDICATORS
1 COLLECTIVE REFERENCE MARKERS
(In view only if a FD Collective mode is engaged)
The collective reference markers (fixed) are set as two hollow
magenta triangles pointing towards each other: they represent the
required position of the collective lever to fulfil the FD collective
command
2 COLLECTIVE CUE
(In view only if a FD Collective mode is engaged). The
collective cue represents the current position of the collective lever
relative to reference markers. If collective cue is shown below the
reference markers, the collective lever is to be pulled up, and
viceversa.
3 ENGAGED VERTICAL COLLECTIVE MODE Annunciator
Shows what collective mode is engaged (captured)
Green ............... Flight Director is operating normally
Amber ............... Collective trim actuator is failed or collective pitch
mode (ie ALT) is affected by the FD torque
limiting function
4 ARMED VERTICAL MODE Annunciator (white)
Shows what vertical mode(s) is(are) armed (collective and/or pitch)
5 ENGAGED VERTICAL PITCH MODE Annunciator
Shows what pitch mode is engaged (captured)
• Green .............. Flight Director is operating normally
• Amber ............. Both linear actuators are failed or vertical
pitch mode (ie IAS) is affected by the FD
torque limiting function
6 ENGAGED LATERAL MODE Annunciator
Shows what roll mode is engaged (captured)
• Green ............................ Flight Director is operating normally
• Amber ........................... Both linear actuators are failed
7 ARMED LATERAL MODE Annunciator (white)
Shows what lateral mode is armed (roll)
• Green ............................ Flight Director is operating normally
• Amber ........................... Both linear actuators are failed led
8 FLIGHT DIRECTOR SOURCE SELECT ARROW AND STATUS
The source select arrow points towards the PFD that is supplying
navigation and mode select data to both flight directors.
• Green ........................ Associated Flight Director is valid
• Amber ........................ Associated Flight Director is invalid
• FD FAIL flag .............. Both Flight Directors invalid (replaces
the arrow annunciator)
9 FD COMMAND BARS