theamrad:
Question concerning Airbus FADEC:
Notwithstanding Safety Concerns warning, and given the earlier posts trying to explain the ACARS messages. I presume with no sign of degraded engine performance and no loss of engine indications, and that PFD flags concerned only airspeed (and possibly alt) – attitude reference was still available. I presume with A/TH disconnected – the throttles allow the setting of a specific n1(from the unreliable speed chart etc), subject to FADEC derived limits??
Also – do the FADEC units derive their main sensed data from their own dedicated sensors – or is some derived externally (ADIRU’s etc)?
GE CF6-80E1 - FADEC (ECU) is selfpowered by engine alternator when N2 > 12%.
As far as I know:
ADIRU input is used for N1 Limiting / Thrustsetting.
When A/THR is off,
Fuel Metering is proportional to T(hrust) L(ever) A(ngle)
with structural and thermal protections from its own ' Engine mounted' sensors.
A330 GE Engine Testrunner.