TM 1-1520-238-T-57–138Change 27–46.PRESSURIZED AIR SYSTEM – WIRING INTERCONNECT DIAGRAM (cont)7–461W102J1P217(NOTE 10)FGS541S14 SP1 (M)W102SDC OUTLETPRESSURE SWITCH(NOTE 4)S14312(NOTE 10)S14 SP2 (M)DC GND28 VDCSDC INLETTHROTTLE VALVE(NOTE 8)L1321KW102FGS543FUEL BSTCB577.5A28 VDCDC ESSBUS 2A76W605A(1)B(1)C(1)D(1)E(1)F(1)P/O PILOT CENTERCIRCUIT BREAKER PANEL(NOTE 1)ABCAAGNOTES:HIGHWAY USE: THE ALPHA CHARACTER IDENTIFIES A SPECIFIC LINE, AND THE NUMBER IN PARENTHESIS IDENTIFIESTHE 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 PSIDECREASING 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 C1SOLENOID 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 340º- 360º F (171º - 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.21M68-003-2BSHEET 2 0F 2
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