TM 1-1520-238-T-5
8–28
8–7.
SYSTEM DESCRIPTION (cont)
8–7
(d) The refuel FUEL QTY indicator (fig. 8–24) receives 24 VDC battery power through the IND ON/OFF
switch via the FSC. The FSC converts forward and aft fuel cell sensor data to linear 0 to 5 VDC. The refuel
indicator changes electrical inputs into mechanical outputs. The mechanical outputs move the pointers along the
scale.
PRI+
PSIX 1000
6
HYD
4
3
2
0
PRIMARY
POINTER
UTILITY
POINTER
PRIMARY PRESSURE
TRANSDUCER
UTILITY PRESSURE
TRANSDUCER
PILOT EXT
LT / INTR
LT PANEL
0 - 5 VDC EDGE -
LIGHTING
0 - 5 VDC
0 - 5 VDC
UTILITY
METER
MOVEMENT
PRIMARY
METER
MOVEMENT
PRESSURE INDICATOR
PILOT DUAL HYDRAULIC
+UTIL
M68-134A
Figure 8–21.
Pilot Dual Hydraulic Pressure Indicator Functional Block Diagram
DIAL
POINTER
0
1
2
3
45
UTIL
ACC
PSIx
1000
PILOT EXT
LT / INTR
LT PANEL
0 - 5 VDC EDGE - LIGHTING
EMERGENCY
PRESSURE
TRANSDUCER
0 - 5 VDC
HYDRAULIC PRESSURE
INDICATOR
M68-133
Figure 8–22.
Pilot Emergency Hydraulic Pressure Indicator Functional Block Diagram
