View Full Version : Airbus FBW - triple clicks
AirbusFan
28th Jun 2004, 13:59
Just seeking clarifcation of reasons for the triple click 'alert' to sound. My understanding is that it occurs on a downgrade from say cat 3 to cat 1. Some other text says that it also occurs when a new altitude is selected during ALT* and the ALT knob is not pushed or pulled.
Are these statements correct and are there any other causes?
Thanks in advance
AirbusFan.
mogley
28th Jun 2004, 15:21
You are both correct. The triple clicks or the cricket sounds:-
1) When the aircraft is first powered up & the FMGCs have completed their self tests
2) When there is a downgrade in the approach capability.
:O
mcdude
28th Jun 2004, 16:57
Also;
Depending on options and FMGC standard, triple click will sound;
- If "GPS PRIMARY LOST" during approach
- With CLB + NAV modes active, NAV mode is lost or disengaged (OP CLB engages).
rgds/mcdude
FlapsOne
28th Jun 2004, 19:04
The following sequences, or mode reversions, are highlighted by a triple click :
V/S selection in ALT*
SPD selection in SRS
CLB (or EXP CLB) to OP CLB, upon lateral crew action while climbing toward a constraint
ALT* to V/S, upon ALT target change
FD disengagement in OPEN modes
Alerting FMA display when V/S-(FPA) target is not held
CLB to OP CLB reversion, upon profile loss
Automatic FD re-engagement in basic mode
DES to V/S upon flight plan loss, or upon no lateral crew action
FINAL DES to V/S, upon NAV loss
Reversion to V/S when selected ALT crosses the current altitude
Automatic FD re-engagement in basic lateral mode
NAV to HDG, upon NAV loss
(ILS) CAPABILITY DOWNGRADE.
Condition(s) required for CAT3/CAT2 are no longer fulfilled.
GPS PRIMARY LOST
plus a few others I guess !!!!!!!!!!!!
AirbusFan
28th Jun 2004, 20:42
Thanks FlapsOne,
I got the impression it occured during reversions (at least with later software).
AirbusFan