Each engine gauge is a 225-degree arc with moving pointer and fixed
current value window located above the pointer rotation point.
Each
engine gauge type is labeled in white between the left and right
gauges
as shown in Figure 246.
2. H. (2) Engine Instruments
(ENG)
(a) Engine Pressure Ratio (EPR) Display - The EPR instruments
(left/right) are the top row of scales on the engine instrument
side of the display format (Figure 246). The details of the
EPR scale operation are discussed
in paragraph 2.E.(2)(a).
(b) EPR Limit/Target Readout and
Bug, Source and Mode Annunciations
- Operation of this function is identical to the EPR command
description provided in paragraph 2.E.(2)(b).
(c) Turbine Gas Temperature (TGT) Display - The TGT instruments
form the second row of scales on the engine instrument side of
the display format.
The operational description of the TGT
function is provided in paragraph 2.E.(2)(g).
(d) Low Pressure (LP) Tach Display - The LP instruments comprise
the third row of gauges on the primary engine display. The
operational description of the LP tach function is provided in
paragraph 2.E.(2)(h).
(e) Anti-Ice (A/1) Annunciator - This annunciation is displayed in
green above the LP digital readout windows. The annunciation
label isA/I.
(f) 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.
(9) High pressure (HP) Tach Display - The HP instruments form the
fourth row of engine instruments on the format. This display
differs from the engine display format
in that only a digital
readout of HP is provided. The HP digital readout colors are
dependant on actual HP values as follows:
RED O%RPMS HP < 46.7% RPM
WHITE 46.7% RPMs HP < 97.5% RPM
AMBER 97.5% RPM~ HP < 99.7% RPM
RED 99.7% RPMs HP < 110% RPM
The HP digital readout is readable to a 0.1% RPM resolution.
22-14-00
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