PantLoad
The AAIB report states:
"G-EZAC was fitted with an upgraded digital
Audio Management Unit (AMU) for all the RTF
communications.
Unlike earlier versions, its operation
depended on a power supply from
a single busbar
(DC ESS). Airbus advised that this meets present
certification standards."
Furthermore:
"It had been found that the contents
of a Static Read-Only-Memory (SRAM) component
could alter and that this would result in a GCU
‘Failsafe’ fault and isolation of the
associated IDG
from the electrical system."
Conclusion:
Due to the failed SRAM, any IDG available was rejected finally
and associated buses were lost.
Now what about
this to discuss:
Could they have used the RAT ?
The RAT powers AC ESS
directly (via no BTC´s or so) and
additionally the DC ESS via the ESS TR.
It works as a bypass of the normal electrical system to guarantee
some essential electrical supply.
Of course:
There was
no ECAM drill to ask for this, I know, and I dont know
what
I would have done in this situation.
(Remark: I absolutely dont want to blame the crew for not trying it!!)
But here is the "green table" and I think, they could (??) have recovered
the AC ESS bus via this and as a result the DC ESS with all the radios.
Any electrical guru here ?
