TM 1-1520-238-T-710–108Change 210–18. FUEL CROSSFEED/BOOST SYSTEM – WIRING INTERCONNECT DIAGRAM (cont)10–181-2,4-5CLOSEDNORMALTO28 VDCCROSSFEED/SHUTOFF VALVE, AS SELECTED.2-3,5-6CPG - FROM AFT: PILOT AFT TK2-3,4-5CPG - FROM FWD: PILOT FWD TKNORM (CPG AND PILOT)TERMINALS CONNECTEDPROVIDES 28 VDC TO NORMAL OR CLOSED CIRCUITS OF ASSOCIATEDSELECTS FUEL TANK (CELL) TO SUPPLY FUEL TO ENGINES.ENABLES AND DISABLES PILOT AND CPG FUEL PANELS.OFFONPOSITIONSWITCH3.SWITCH POSITION2.1.NOTES:4.USED ONLY FOR STARTING ENGINES AND HIGHALTITUDE FLIGHT. (HOLDING COIL HOLDS SWITCHAT BOOST POSITION IF AFT TANK IS SELECTED BY S1).5.S2 AND S3 (NORMALLY CLOSED) PROVIDES 28 VDCTO S5 AND S6 ON PILOT FUEL PANEL FOR NORMALOPERATION. (WHEN EITHER CPG FIRE HANDLE ISPULLED THE 28 VDC IS ROUTED THROUGH ASSOCIATEDPILOT FIRE HANDLE (NOT SHOWN) AND S5 AND S6OF PILOT FUEL PANEL TO CLOSE SELECTED ENGINEFUEL CROSSFEED/SHUTOFF VALVE).6.PROVIDES 28 VDC THRU S5 AND S6 ON PILOT FUELPANEL TO CLOSED TERMINAL OF SELECTED ENGINEFUEL CROSSFEED/SHUTOFF VALVE, WHEN EITHER OF PILOT ORCPG FIRE HANDLES ARE PULLED, S2 AND S3 (NORMALLY OPEN).7.PROVIDES 28 VDC TO BOOST PUMP AIR VALVE (L15) DURING EITHERENGINE START OR WHEN BOOST PUMP SWITCH IS ON.8 CLOSES WITH BOOST PUMP PRESSURE TO APPLY 28 VDC TO LIGHTBOOST PMP ON INDICATOR.9.ELECTRICAL SYSTEM (TM 1-1520-238-T-6).10.M DESIGNATES A SOFT SPLICE WHICH MAY BE DISCONNECTEDFOR A WIRING CHECK.11.REFER TO PARAGRAPH 10 - 49. FUEL QUANTITY INDICATION /TRANSFER - WIRING INTERCONNECT DIAGRAM.12. DELETED13.POWER PLANTS (TM 1-1520-238-T-4).14.UTILITY SYSTEM (TM 1-1520-238-T-8).15.AUXILIARY POWER UNIT (TM 1-1520-238-T-8).HIGHWAY USE: THE ALPHA CHARACTER IDENTIFIES A SPECIFIC LINE, AND THE NUMBER INPARENTHESIS IDENTIFIES THE SHEET NUMBER WHERE THE SIGNAL TERMINATES.M70-002-6ASHEET 6 OF 6
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