1.19.2010

B747 CHAPTER 28







28








2500
1500
13500
35000
45000










SURGE
RES2
RES1
MAIN1
MAIN2
CENTRE
MAIN3
MAIN4
RES4
RES3
SURGE




1.           TOTAL FUEL FOR 747-SP IS 150000KG
2.           RES3,4 IS ONLY IN 747-SP
3.           2 O/R JETISON PUMP IN CENTER
4.           2  J/P IN MAIN 2,3 EACH
5.           FUEL CAN TRANSFER FROM RES TO MAIN VIA TRANSFER VLV BY GRVITY
6.           FUELING CAN DONE WITHOUT POWER, ALL VLV HAVE MANUAL OVERRIDE
7.           TEMP SENSOR IS IN MAIN1
8.           SURGE TANKS HAVE JETISON NOZZLE VLV TO SEND FUEL TO OUTBOARD
9.           FOR GND TRANSFER DESTINATION DEFUEL VLV MUST OPEN AND:
BOOST PUMP ON+ MANUAL DEF/REF VLV ON OR
JETISON PUMPS: DO NOT NEED R/D VLV OR
FROM CENTER TO MAIN: O/R J/P ON+ JET VLV ON
10.        MANUAL D/R VLV CONNECTS FEED LINE TO JET LINE
11.        BOOST PUMPS PRODUCE 25 PSI , J/P ARE 55 PSI
12.        MAN R/D VLV HAS SW ON REMOTE PNL FOR TRANSFER FUEL
13.        TRANSFER FROM CNTR TO INNERS TO OUTERS NEED MAN R/D VLV OPEN
14.        O/R J/P IS IN HIGHER LEVEL THAN BOOST PUMPS SO CNTR NEED A SCAVENGE PUMP TO PREVENT REMAIN EXTRA FUEL IN  CNTR
15.        THERE ARE 12 R/D VLV:
2 FOR EACH CENTR, MAIN2, MAIN3
1 FOR EACH RES, MAIN1, MAIN 4
  1.                 EAH ENG FED BY OWN MAIN TANK (ENG1 BY TANK1…)
  2.                 4 XFEED VLV PERMIT EACH TANK TO FEED OTHER ENG
  3.                OUTER TANKS MUST TRANSFER TO INNERS FOR JETISON
  4.                 4 VOLUMETRIC COMPENSATOR:
IN MAIN1, 4
IN MAIN2 FOR MAIN 2, 3
IN RES1 FOR ALL RES
  1.                 TANKS VENTED BY DUCTS AND RAM AIR SCOOP AND FLAME ARRESTOR
  2.                 SCOOPS PRESS THE TANKS TO MINIMIZE FUEL LOSS
  3.                ALL R/D VLV WILL CLOSE WHEN SURGE TANK RECEIVE 40 GALLON BY AN OVERFILL FLOAT SW
  4.                MAIN TANKS HAVE FILLING PORT OVER WING
  5.                R/D CLOSE IF POWER SHUT
  6.                OVER FILL RESET SW ALLOWS FUELING IF SURGES DRAINED
  7.                EACH TANK HAS A GAGING COMPENSATOR
  8.                GAGE TEST IS DISABLED DURING FUELING
  9.                VOL S/O UNIT IN MEC  R/D VLV
  10.                VSOU CARDS:
S/O CARD: 1 FOR EACH TANK
DENSITY CARD: PROTECTS OVERFILL OF MAIN1, 4
 VARIABLE RESISTOR
POWER CARD
  1.                 TEST GAGE SW CONNECTED TO DENSITY CARD
  2.                 O/R J/P HAS CURRENT DET
  3.                 IF BOOST PUMP OFF , FUEL CAN GO TO ENG’S BY BOOST PUMO BYPASS VLV
  4.                 ALL VLV ACTUATORS ARE I/W EACH OTHER
  5.                 IF O/R J/P REPLACED WITH J/P IN INNERS, 3 PUMP MUST USE NOT 4



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