Hi Conf,
This discrete represents the source of the vertical speed indication on PFD.
From the report: page 94 (English version)
@12:11:45
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The vertical speed is no longer calculated by the IR (Inertial reference)
but by the ADR.
It is about -10,000 ft/min.
and confirmed by FCOM.
FCOM
1.31.40
INDICATIONS ON PFD
VERTICAL SPEED:
The displayed vertical speed information is normally based on both inertial and barometric data.
If inertial data is not available, it is automatically replaced by barometric information.
In this case, the window around the numerical value becomes amber.
That will raise another question, why was IR V/S not available?
was it related to:
02:13:14 - .1/FLR/FR0906010211 34123406IR2 1,EFCS1X,IR1,IR3,,,,ADIRU2 (1FP2),HARD
and this fault message related to disapperance of FPV?
The presence of the “FLAG FPV ON PFD CAPT (F/O)” message indicates that TRK-FPA
(Flight Mode Annunciator) mode was selected by the crew during minute 2 h 11, but that the
FPV was unavailable (see interim report 2 for details on the conditions of availability). Based
on a study of the other relevant parameters it may be concluded that the FPV was selected between
2 h 11 min 48 and 2 h 11 min 54.