Low Pressure (Lp) Tach Display; Anti-Ice (A/1) Annunciator; Lp Synchronization (Sync) Annunciator; High Pressure (Hp) Tach Display - Honeywell SPZ-8000 Maintenance Manual

2. E. (2) (h)
(i)
(j)
(k)
Low Pressure (LP) Tach Display - The LP instruments comprise
the center row of gauges on the primary engine display (Figure
223). The LP arc is banded with white and red colors to
indicate the normal and warning ranges respectively on the arc.
The arc boundaries range nonlinearly from O%RPM to 110% RPM.
The color range definition for LP is as follows:
WHITE O%RPM s LP < 95.5% RPM
RED
95.5% RPM ~ LP < 110% RPM
The LP
actual value corresponds to the pointer position on the
scale and is readable to a 0.1% RPM resolution.
If the actual
data goes above 110% RPM, the pointer remains stationary at the
upper arc limit and the digits
shown the actual
LP
value.
LP exceedance (red region) is shown by growing the red band to
twice the normal width and changing the pointer and digital LP
value color (normally white) to match the arc region color.
Anti-Ice (A/1) Annunciator - This annunciation is displayed in
green above the LP digital readout windows.
The annunciation
label isA/I (Figure 223).
LP Synchronization (SYNC) Annunciator - If the crew chooses to
sync the engines using LP, a SYNC annunciation is displayed in
green directly below the LP scale label (Figure 223).
High Pressure (HP) Tach Display - The HP instruments form the
fourth row of gauges on the primary engine display (Figure
223). The HP arc is banded with red, white, amber, and red
colors to show the low end warning, normal, high end caution,
and high end warning ranges on the arc. The arc boundaries
range nonlinearly between O% RPM to 110% RPM. The color range
definition for HP is as follows:
RED
O%RPM s HP < 46.7% RPM
WHITE 46.7% RPM ~ HP < 97.5% RPM
AMBER 97.5% RPM s HP < 99.7% RPM
RED 99.7% RPM g HP < 110% RPM
The HP current value corresponds to the pointer position on the
scale and is readable to a 0.1% RPM resolution. If
the actual
data goes above 110% RPM, the pointer remains stationary at the
upper arc limit and the digits
shown the actual HP value.
HP exceedance (amber and red region) is shown by growing the
colored band to twice the normal width and changing the pointer
and digital HP value (normally white) color to match the arc
region color.
22-14-00
Page
270
Aug 15/91
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