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breaker on the pilot circuit breaker panel. The other
pilots power supply and both CPG power supplies receive
28 vdc from the emergency dc bus through the
ENG INST circuit breaker on the CPG No. 1 circuit
breaker panel. The illuminated segments at the vertical
scale instruments are referenced to the adjacent
instrument indices and utilize a technique called optimistic
scaling. This means, for example, that for proper
indication of 100% Np/Nr the segments immediately
above the instrument index line for 100% should be at
the threshold of illumination.
Figure 2-20. Engine Instrument Test Panel
2.32.1 Pilot Engine Instruments. All of the pilot engine
instruments are on the left side of his instrument
panel. These instruments are tested by the pilot engine
instrument test panel (fig 2-20). When the switch on
the test panel is set at NORM, all instrument lights are
operated by their functional inputs. When the switch is
set at DGT OFF, all digital displays turn off. When the
switch is set at TST, all digital displays indicate 888,
and all vertical-scale readings are illuminated sequentially
from the bottom to full scale for 3 seconds, then
extinguish. The following engine instruments are located
on the pilot instrument panel:
a. Turbine Gas Temperature Indicator (TGT °C
x 100). The TGT indicator is a dual, vertical-scale
instrument with dual digital readouts beneath the
scales. Temperature is sensed at the power turbine inlets
by seven thermocouple probes. These signals are
averaged and routed through the ECU/DECU, processed
by the data signal converter, and transmitted to
the crew station indicators. The DECU 701C incorporates
a 71 °C bias in its software which results in the
indicated TGT reading cooler than the actual TGT. This
permits use of the same TGT gauge for the -701 and
-701C engines. When the helicopter is on battery power
only and a given engine has not been started, the TGT
signal is passed through the DECU to the TGT gauge
without the 71 °C bias. When the helicopter has 115
vat, 400 Hz power applied, and a given engine has not
been started, the DECU is powered and applies the
71 °C bias to the TGT signal for display. If when the helicopter
has 115 vac, 400 Hz power applied prior to
starting a given engine and the actual TGT minus the
71 °C bias results in a negative number, the indicated
TGT maybe erroneous with a significant mismatch between
pilot and CPG TGT gauges. During engine start,
the TGT will increase until the sum of the actual TGT
minus the 71 °C bias equals a positive number, then the
indicated TGT values will be correct.
b. Torque Indicator (TORQUE %). The torque indicator
is a dual vertical-scale instrument with dual
digital readouts beneath the scales. The engine torque
sensor sends pulsed signals to the engine ECU/DECU
where torque signals are computed and sent to the crew
station indicators.
c. Gas Generator Turbine Speed Indicator (NG
RPM %). This is a dual, vertical-scale instrument
with dual digital readouts beneath the scales. Speed
signals are taken from the engine alternators and sent
directly to the crew station indicators.
d. Power Turbine and Main Rotor Speed Indicator
(ENG-RTR RPM %). This is a triple, vertical-scale
instrument. The two outer scales (Np 1 and Np 2) indicate
speeds of the power turbines. The engine power
turbine driveshaft sensors transmit pulsed signals to
the engine ECU/DECU where they are computed into
speed signals and then sent to the crew station indicators.
The middle scale registers main rotor speed (Np)
and receives inputs directly from a magnetic pickuptype
tachometer generator on the transmission.
e. Oil Pressure indicator (ENG OIL PSI x 10). This
is a dual, vertical-scale instrument. Pressure signals
are taken from the engine oil system transducers and
are displayed on the crew station indicators.
2-32
TM 1-1520-238-10
2.32.2 CPG Engine Instruments. The CPG instrument
panel has a power turbine and main rotor speed
vertical-scale indicator and an engine torque verticalscale
indicator identical to those on the pilot instrument
panel. To compensate for the absence of TGT, NG,
and oil pressure indicators, a selectable digital display
(SDD) panel (fig 2-21) is installed to the right of the
CPG engine torque indicator. To obtain a readout, the
SELECT knob is turned until an advisory light is displayed
in the desired position on the right side of the
panel. When the SELECT knob is rotated fully clockwise,
no advisory light will be illuminated and the digital
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