Hi Takata:
Just found out why the
NAV IAS DISCREAPANCY message might be suspressed.
(Not completely sure, because we don't know the exact ECAM software status but this one is dated 08/NOV/06, so could be valid at that date)
1// The
NAV IAS DISCREAPANCY can be triggered by a ADR 1 or ADR 2 IAS FAULT FOR PRIM status (as detected by FCDC1 or 2).
ADR 3 status comes only into view when ADR 3 data switch is out of the normal position)
2// The
NAV IAS DISCREAPANCY can be triggered by a FROZEN PITOT Status (as detected by FCDC1 or 2).
But both 1// or 2// conditions to trigger the
NAV IAS DISCREAPANCY message can be suspressed by certain system conditions being TRUE.
a/ any Dual or Triple ADR Failures (
NAV ADR x+y(+z) FAIL messages not mentioned)
b/ All ADRs INOP [Switched Off] (not mentioned)
c/
NAV ADR DISAGREE present (not before ca. 02:12:00)
d1/ ADR CAS 1
or CAS 2
or CAS 3 NCD(or INValid) for reference 1//: IAS Fault for Prim status
d2/ Any DUAL CAS NCD(or INV) for reference 2//: Frozen pitot status
With this information I need to rethink what I posted before, maybe you could find some justification in your point of view.
