TM 1-1520-238-T-710–150Change 510–47. FUEL QUANTITY INDICATION/TRANSFER – MAINTENANCE OPERATIONAL 10–47CHECK (cont)TaskResultf. On CPG selectable digital display(fig. 10–65), push and hold TESTpushbutton. Check that digital readoutsindicate 888, then release.If digital readouts do not indicate 888, refer toTM 1-1520-238-T-5 to troubleshoot engineinstruments.NOTEA difference of up to 10 % between pilot and CPG readouts is acceptable.g. Select FUEL QTY on CPG selectable digitaldisplay and compare CPG selectable digitaldisplay digital readouts with pilot FUELquantity indicator (fig. 10–63) TOTAL digitalreadout.If selectable digital display digital readouts do notagree with pilot FUEL quantityindicator TOTAL digitalreadout, refer to TM 1-1520-238-T-5 to troubleshootengine instruments.h. On pilot FUEL quantity indicator, check thatFWD vertical display indicates 29to 31.If pilot FUEL quantityindicator FWD vertical displaydoes not indicate 29 to 31, go to paragraph 10–48 or10–48A.i. On pilot FUEL quantity indicator, check thatAFT vertical display indicates 19to 21.If pilot FUEL quantityindicator AFT vertical displaydoes not indicate 19 to 21, go to paragraph 10–48 or10–48A.j. On pilot and CPG caution/warning panels(fig. 10–56 and fig. 10–57), check that FUELLOW AFTindicators are lighted and FUELLOW FWD indicator and REFUEL VALVEOPENindicator are not lighted.If FUEL LOW AFT indicators are not lighted, go toparagraph 10–52.If pilotFUEL LOW FWD indicator is lighted, go toparagraph 10–62.If REFUEL VALVE OPEN indicator is lighted, haveassistant open R160 door and verify on refuelingpanel (fig. 10–61) that REFUEL VALVE switch is setto CLOSE. If switch is set to CLOSE and refuel valveindicator remains lighted, go to paragraph 10–76,then complete this maintenance operational check.k. On pilot and CPG caution/warning panels,check that amber FUEL XFR indicators arenot lighted.If pilot and CPG amber FUEL XFER indicators arelighted, go to paragraph 10–66C.l. (ADA) On pilot and CPG instrument panels,check that green FUEL XFR/XFER advisorylights (fig. 10–67) are not lighted.If pilot and CPG green FUEL XFR/XFER advisorylights are lighted, go to paragraph 10–66G.
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