Originally Posted by
alf5071h
Thence if an alerting system was fitted, was it functional, was it adhered to ?
I recall that it was suspected that the Helios 737 audio alert was mistaken for overspeed - warning horn.
I am pretty sure that the investigation will thoroughly look into these items. According to internet wisdom, the aircraft was only recently imported from Venezuela in January this year. What equipment was installed and functional should be listed in the maintenance records. The little information that has been disclosed about the pilot is that he was a retired airline captain with over 25.000 flying hours.
As written above, the C560 has no aural cabin pressure warning. Only annunciator lights. When then sun shines directly onto the annunciator panel, a warning light coming on can easily be missed. As a backup warning, the passenger oxygen masks drop automatically when passing 14.000ft, startling the passengers, who will certainly ask the pilot what's going on. But this only works if the relevant switch is in the correct position and the oxygen bottle has enough pressure and the bottle valve is open.