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-   -   Airbus FBW - triple clicks (https://www.pprune.org/tech-log/135627-airbus-fbw-triple-clicks.html)

AirbusFan 28th Jun 2004 13:59

Airbus FBW - triple clicks
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


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.

mcdude 28th Jun 2004 16:57


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).


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


Condition(s) required for CAT3/CAT2 are no longer fulfilled.


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).


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