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switch to BIT will cause coded diagnostic messages to
Use the digital readout on the MPD when appear on the MPD digital displays that can be used to
adjusting/setting the NR/NP. The NR vertical identify a fault. Diagnostic message codes are
scale indicator and the MFD NR backup identified in the maintenance manual.
display may indicate 1% higher than the
actual NR, which is shown on the MPD d. Transmission Oil (XMSN OIL) Temperature and
digital readout. Pressure Indicators. Vertical scale displays for
transmission oil temperature and pressure are located
The MPD (11, fig. 2-6 and fig. 2-22) is located in the on the MPD (11, fig. 2-6). Temperature and pressure
lower center area of the instrument panel and contains signals are sensed at the transmission and routed to
vertical scale displays for transmission oil pressure and the MPD through the MCPUs.
temperature, engine oil pressure and temperature, fuel
quantity, and gas producer turbine speed (Ng). The Ng e. Engine Oil (ENG OIL) Temperature and Pressure
speed is also indicated on a digital display. Two Indicators. Vertical scale displays for engine oil
additional digital displays provide readouts for 10 temperature and pressure are located on the MPD
selectable parameters in pairs. Any of the following five panel (11, fig. 2-6). Temperature and pressure are
pairs of parameters can be displayed as desired by sensed from the engine oil system and transmitted to
actuating the SEL (select) switch. An indicator light the MPD through the MCPUs. The scale on the left
identifies the selected pair of parameters. indicates engine oil pressure (ENG OIL P) in pounds
2-62
TM 1-1520-248-10
per square inch (PSI X10). The scale on the right percent. Rotor speed signals are received from the
indicates engine oil temperature (ENG OIL T) in m a s t t o r q u e s i g n a l p r o c e s s o r t h r o u g h t h e
degrees Celsius (°C X10). multiparameter display. The right scale indicates power
turbine speed (NP) in percent. Digital indications of NR
f. Fuel Quantity (FUEL QTY) Indicator. A vertical and NP can also be selected (11, fig. 2-6).
scale display for fuel quantity (FUEL QTY) is located on
the MPD panel. The display indicates total fuel (FUEL
QTY) in pounds (LBS X100). A digital indication of fuel
quantity can also be selected (11, fig. 2-6). 2-88. MAST TORQUE (TRQ)/TURBINE GAS
TEMPERATURE (TGT) INDICATOR.
g . G a s P r o d u c e r T u r b i n e S p e e d ( N G )
Indicator. Vertical scale and digital displays for gas The mast torque (TRQ)/turbine gas temperature (TGT)
producer turbine speed (NG) are located on the MPD indicator (3, fig. 2-6) is located on the upper center
panel. Speed signals are sensed by engine-mounted portion of the instrument panel. The indicator has
magnetic pickups and transferred to the MPD through
vertical and digital displays for each parameter. Turbine
the MCPUs. The vertical scale display indicates percent
(% RPM X10) rpm of gas producer turbine speed (NG). gas temperature (TGT) in degrees Celsius (°C X100) is
The digital readout indicates the percent rpm of gas indicated on the left vertical scale and digital displays.
producer turbine speed (11, fig. 2-6).
Turbine gas temperature is sensed at the gas producer
h. BRT Knob. Turning the brightness control knob drive turbine outlet and routed to the indicator through
adjusts the selected VSDS intensity. the MCPUs and MPD. Main rotor mast torque (TRQ) in
percent is indicated on the right vertical scale and
i. Multifunction Display Backup (MFD BKUP). As digital displays. Torque signal is sensed from one
additional displays to the crew  rotor rpm, ENG TRQ upper and two lower mast torque sensors and routed to
and mast torque  are displayed across the top of the the indicator through the mast torque signal processor,
pilot and CPG MFD screens, they can be deactivated
MCPUs, and MPD.
by pressing the MFD BKUP switch in the MPD (fig. 2-
22).
2-89. ENGINE INSTRUMENTS  WARNING,
2-87. RPM VERTICAL SCALE INSTRUMENT. CAUTION, AND ADVISORY SYSTEM.
The RPM vertical scale instrument (2, fig. 2-6) is
located on the upper center portion of the instrument Engine related warnings, cautions, and advisories are
panel. The left scale indicates main rotor speed (NR) in included in the warning, caution, and advisory system.
SECTION XV. SERVICING, PARKING, AND MOORING
2-90. SERVICING. specified in FM 10-67, Aircraft Refueling
Field Manual.
a. Servicing Diagram (fig. 2-26).
b. Approved Military Fuels, Oils, Fluids, and Unit 2-91. APPROVED COMMERCIAL FUEL, OILS,
Capacities (Table 2-1). AND FLUIDS.
c. Fuel Samples. Fuel samples are taken daily to a. Fuels (Table 2-2).
check for water or other contaminations in fuel. When
　
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