TM 1-1520-238-T-5
7–138
Change 2
7–46.
PRESSURIZED AIR SYSTEM – WIRING INTERCONNECT DIAGRAM (cont)
7–46
1
W102
J1
P217
(NOTE 10)
F
GS541
S14 SP1 (M)
W102
SDC OUTLET
PRESSURE SWITCH
(NOTE 4)
S14
3
1
2
(NOTE 10)
S14 SP2 (M)
DC GND
28 VDC
SDC INLET
THROTTLE VALVE
(NOTE 8)
L13
2
1
K
W102
F
GS543
FUEL BST
CB57
7.5A
28 VDC
DC ESS
BUS 2
A76
W605
A(1)
B(1)
C(1)
D(1)
E(1)
F(1)
P/O PILOT CENTER
CIRCUIT BREAKER PANEL
(NOTE 1)
ABC
AAG
NOTES:
HIGHWAY USE: THE ALPHA CHARACTER IDENTIFIES A SPECIFIC LINE, AND THE NUMBER IN PARENTHESIS IDENTIFIES
THE SHEET NUMBER WHERE THE SIGNAL TERMINATES.
1. ELECTRICAL SYSTEM (TM 1-1520-238-T-6).
2. AUXILIARY POWER UNIT (TM 1-1520-238-T-8).
3. FUEL SYSTEM (TM 1-1520-238-T-7).
4. OPENS AT 15 PSI INCREASING PRESSURE, CLOSES AT 7
+ 2 PSI DECREASING PRESSURE.
5. PERMITS INPUT AT C1 TO ENERGIZE K2 - 1 / 2 SOLENOID.
6. CLOSES CIRCUIT WITH APU START SWITCH AT START POSITION.
7. SOLENOID ENERGIZES WITH INPUT AT C1
SOLENOID DE-ENERGIZES 62 SECONDS AFTER INPUT AT C1.
(ALLOWS APU TO REACH OPERATING SpEED BEFORE OPENING SDC THROTTLE VALVE).
8. 28 VDC INPUT WITH A MINIMUM OF 15 PSI PAS AIR INPUT AT PRESSURE PORT OPENS SDC INLET THROTTLE VALVE.
9. SWITCH CLOSES AT 340
º - 360
º F (171
º - 182º C) WITH INCREASING TEMPERATURE.
SWITCH OPENS AT 330º - 315º F (166º -157º C) WITH DECREASING TEMPERATURE.
10. HS DESIGNATES A HARD SPLICE WHICH CANNOT BE DISCONNECTED FOR A WIRING CHECK.
M DESIGNATES SOFT SPLICE WHICH MAY BE DISCONNECTED FOR A WIRING CHECK.
2
1
M68-003-2B
SHEET 2 0F 2
