R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 31-64-00Page A16 1201-299, 301-302, 1May 01/05 1 1 1CES 1 The value for the displayed Vc is transmitted by the ADIRU on the label 206.
(2) Vc Trend
R **ON A/C 106-149, 303-399, 401-499,
(Ref. Fig. 050)
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
(Ref. Fig. 051)
**ON A/C ALL
This yellow arrow gives an analog display of the Vc trend. The head of the arrow points on the scale to the indication of the Vc value which will be reached in 10 s if the A/C keeps its present acceleration. This symbol is presented if the speed difference exceeds a 2 kts threshold and it is removed when the speed difference becomes less than 1 kt. speed difference is absolute value of: (speed in 10 s minus actual speed). The gradient for the display of the symbol is limited to 12 kts/s. The value for the displayed Vc trend is transmitted by the FAC on the label 262.
1EFF : ALL 1 31-64-00Page A17 1 1 Aug 01/05 1 1 1CES 1
(3) Selected Speed (Vsel) A cyan triangular symbol indicates on the Vc scale the selected speed. That speed is:
-either the speed elaborated by the FMGC in speed auto control (the symbol changes from cyan to magenta if that speed is a constrained speed)
R **ON A/C 106-149, 303-399, 401-499,
(Ref. Fig. 052)
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
(Ref. Fig. 053)
**ON A/C ALL
item (a), - or the speed selected on the FCU and validated by pulling the speed knob, or automatically chosen if the 2 FMGCs have failed
R **ON A/C 106-149, 303-399, 401-499,
(Ref. Fig. 052)
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
(Ref. Fig. 053)
**ON A/C ALL
item (b). If the selected speed is outside the displayed portion of the Vc scale, it is presented in digital form, written just above or just below the scale according to the sign of the difference (Vsel -Vc).
-In descent mode, with the ECON mode, the selected speed symbol is different: it indicates the range of possible speed values
1EFF : ALL 1 31-64-00Page A18 1 1 Aug 01/05 1 1 1CES 1
PFD - Selected Speed Display
Figure 052
R 1EFF : 106-149, 303-399, 401-499, 1 31-64-00Page A19 1 1 Aug 01/05 1 1 1CES 1
PFD - Selected Speed Display
Figure 053
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 31-64-00Page A20 1201-299, 301-302, 1May 01/05 1 1 1CES 1R **ON A/C 106-149, 303-399, 401-499,
(Ref. Fig. 052)
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
(Ref. Fig. 053)
**ON A/C ALL
item (c).
-If the range of possible speed values is outside the displayed portion of the Vc scale:
-if Vc less than (minimum possible speed value -42 kts), that minimum possible speed is indicated in digital form below the Vc scale
R **ON A/C 106-149, 303-399, 401-499,
(Ref. Fig. 052)
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
(Ref. Fig. 053)
**ON A/C ALL
item (d).
-if Vc more than (maximum possible speed value +42 kts), that maximum possible speed is indicated in digital form above the Vc scale
R **ON A/C 106-149, 303-399, 401-499,
(Ref. Fig. 052)
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
(Ref. Fig. 053)
1EFF : ALL 1 31-64-00Page A21 1 1 Aug 01/05 1 1 1CES 1 **ON A/C ALL
item (e). The selected speed information (from FMGC or FCU) is always displayed. The selected speed is the speed corresponding to the selected mach number with the AFS operating in mach mode.
ITEM LIST
R **ON A/C 106-149, 303-399, 401-499,
(Ref. Fig. 052)
**ON A/C ALL
-----------------------------------------------------------------------------
ITEM PARAMETER EQUIPMENT LABEL COLOUR
-----------------------------------------------------------------------------
V SEL FMGC 103 CYAN
V SEL FCU 103 or MAGENTA
IV SEL RNGH FMGC 307 CYAN
IV SEL RNGL FMGC 306 CYAN
1EFF : ALL 1 31-64-00Page A22 1 1 Aug 01/05 1 1 1CES 1
(4) Decision Speed (V1)
R **ON A/C 106-149, 303-399, 401-499,
(Ref. Fig. 054)
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
(Ref. Fig. 055)
**ON A/C ALL
The V1 indication which is entered before take-off through the MCDU (take-off page), is displayed in cyan color by means of a mark across the scale and a 1 figure. If the V1 value is outside the displayed portion of the Vc scale, the mark and the 1 are replaced by the digital value of V1 written at the top of the scale. V1 (symbol or digits) is displayed only on the ground.
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