SAFETYPEE
h3dxb, thanks for the technical description - ISIS.
Can you establish what the purpose of the temperature sensors is, and if these are internal to ISIS or require an external temperature input.
Is there a difference / switching routine between a failed input – e.g. ADIRS off, ARINC 429, and a working bus (but with corrupt data) i.e. a triple sensor might vote out a system by comparison (IAS) – a 'failed' system, but a dual sensor might pass erroneous data (TAT).
Gents:
there is no description for the temp sensors in any manual. It looks like its for health monitoring of the sensors.
as there is also no CAS or TAT indicated no need for a temp input. the IAS is taken direct from the standby system.
When a part of the ISIS failed than this partial function is inop (degraded) not the whole ISIS.
except Powerloss >200ms this instrument is working.
BOAC
Have we established BEYOND DOUBT that loss of pressure inputs to an ADIRU render that ADIRU unusable for attitude, either because it lacks some feed or because the system determines it to be 'unusable'? If the answer is yes
The answer is NO. ADIRU= AD+IRU
Actually 2 boxes in one. The IRU part works seperately from the ADR Part. U can switch off the ADR part , but when U switch off the IRU, the box is switched off.
Once more ISIS is an Instrument which stands alone. And yes there is a lot of Software inside and !!!!ty expensive as well.
Have a good one, in 12 hrs I'm back on duty, and when it's a smooth day like today, I'll have time for yr questions 