Originally Posted by
Ian W
No the implication is that as the alarm was not heard the CDLS override switch in the center console had been set to override. When that happens all alarms both routine and emergency are muted. The fact that there were no entry alarms at all in the 8 minute descent also means that the override must have been reset after 5 minutes by someone on the flight deck. It is a guarded switch so cannot be accidentally set.
Or perhaps the aircraft was not equipped with the feature, as per the procurator's brief?