TM 1-1520-238-T-5
8–14
8–6.
CONTROLS AND INDICATORS (cont)
8–6
Table 8–1.
Instruments Controls and Indicators (cont)
CPG SDD Panel
SWITCH/INDICATOR
POSITION
FUNCTION
LEFT/FWD digital display
Indicates pounds of fuel remaining in forward fuel cell.
RIGHT/AFT digital display
Indicates pounds of fuel remaining in aft fuel cell.
TEST pushbutton
Press to test the SDD indicators.
OFF/SELECT two–position
OFF
De–energizes SDD panel.
switch
SELECT
Energizes SDD panel. Enables CPG to monitor, via digital
displays, the engine function indicator selected (pilot TGT
C indicator, pilot NG% RPM indicator, pilot FUEL QTY
LB X 10 indicator, and pilot ENG OIL PSI indicator).
M68-157A
RIGHT / AFT
DIGITAL DISPLAY
LEFT / FWD
DIGITAL DISPLAY
OFF / SELECT
SWITCH
TEST PUSHBUTTON
CPG SDD Panel
SECTION II.
THEORY OF OPERATION
8–7.
SYSTEM DESCRIPTION
8–7
a. Instruments.
(1) Engine instruments provide the crew with the means to monitor power turbine (Np) speed, gas
producer turbine (NG) speed, oil pressure, TGT, and torque of each engine plus fuel quantity and the main rotor
rpm. Each instrument operates independently with some readings being duplicated when identical instruments are
located in both crew stations.
(2) The flight instruments measure and display helicopter performance (forward, up, and down), altitude,
and g forces. Not all flight instruments are common to both crew stations. Each instrument operates
independently with some readings being duplicated when identical instruments are located in both crew stations.
