(10)
Remove electrical power, if it is not necessary
(AMM 24-22-00/201).
G.
Reserve Tank Transfer Single Point Sensor Card Ground Test
S 865-022
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-021
(2)
Make sure the airplane is in the ground mode (the airplane is not held up by jacks and the targets are not installed).
S 865-023
(3)
Make sure these circuit breakers are closed:
(a)
P6, Main Power Distribution Panel
1) 6F6, FUEL SYS MGMT CH1
2) 6F8, FUEL SYS MGMT CH2
S 865-024
(4)
Set the GND TESTS switch on the overhead maintenance panel, P461, to the ENABLE position.
S 865-025
(5)
Prepare the CDU for the test:
(a)
Push the MENU key on the CDU to show the MENU.
(b)
Push the line select key (LSK) that is adjacent to <CMC to show the CMC MENU.
(c)
If <RETURN shows after you push the LSK, push the LSK that is adjacent to <RETURN until you see the CMC MENU.
(d)
Push the LSK that is adjacent to <GROUND TESTS to show the GROUND TESTS menu.
(e)
Push the NEXT PAGE key until you find <28 FUEL.
(f)
Push the LSK that is adjacent to <28 FUEL to show the GROUND TESTS menu for the fuel system.
(g)
Push the NEXT PAGE key until you find <SNGL PT SNSR CARD.
NOTE: If INHIBITED shows above <SNGL PT SNSR CARD the test
____
will not operate.
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747-400 MAINTENANCE MANUAL
(h) If INHIBITED shows above <SNGL PT SNSR CARD: 1) Push the LSK that is adjacent to the test prompt. 2) Do the steps shown on the CDU. 3) Push the LSK that is adjacent to <RETURN to show the ground
test menu again.
S 745-026
(6)
Push the LSK that is adjacent to the applicable prompt
(<SNGL PT SNSR CARD).
(a)
Push the LSK that is adjacent to START TEST>.
NOTE: IN PROGRESS shows during the test.
____
S 745-029
(7) When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to the <SNGL PT SNSR CARD.
NOTE: If a PASS indication shows, no failure occured during the
____
test.
(a) IF FAIL> shows: 1) Push the LSK that is adjacent to FAIL> to see the GROUND TEST MSG page for the failure. 2) Push the NEXT PAGE key until you find the GROUND TEST MSG pages. 3) Make a list of all CMCS messages, CMCS message numbers that show on the GROUND TEST MSG pages.
4) Go to the CMCS Message Index of the Fault Isolation Manual to find the corrective action for each CMCS message.
H. Put the Airplane Back to Its Usual Condition
S 865-027
(1)
Set the GND TESTS switch to the NORM position.
S 865-028
(2)
Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
PRESSURE FUELING SYSTEM - DESCRIPTION AND OPERATION
___________________________________________________
1. General_______
A. The pressure fueling system provides a rapid means of filling the fuel tanks in the airplane. The system distributes fuel under pressure from a fueling station in each wing to the tanks through manifolds and refuel valves. The refuel valves allow fuel to flow from the main distribution manifold into the tanks. Power for the pressure fueling system is supplied by the ground handling bus or battery bus.
B. Each fueling station is equipped with two fueling receptacles coupled together to a manifold that extends through the outboard main tank to the main distribution manifold along the rear spar. Each receptacle incorporates a manual shutoff valve.
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