S 864-023
(4) Remove the ESD wrist straps:
(a) Remove the ESD wrist strap from the electrostatic ground
receptacle on the E/E rack.
(b) Remove the ESD wrist strap from your wrist.
(c) Put the ESD wrist strap to the empty bag at the end of the E/E
rack.
S 414-028
(5) Put the WIU panel into its position:
(a) Pull the WIU panel aft and up 90 degrees.
(b) Install and tighten the four bolts.
S 414-016
(6) Install the cargo partition panel.
(a) Install and tighten the 16 bolts.
(b) Put the cargo partition panel into its position.
S 864-029
(7) Do the "Supply Electrical Power" task (Ref 24-22-00/201).
S 864-013
(8) Remove the DO-NOT-CLOSE tags and close these circuit breakers:.
(a) P7 overhead circuit breaker panel
1) 7C1 FMCS FMC L
2) 7C5 FMCS MASTER SW
3) 7C23 FMCS FMC R
S 744-030
(9) Do the test of the FMC master relay:
(a) Make sure the FMC master switch, on the P2 EICAS control
panel/FMC switch, is in the L position.
(b) Show the CMC Existing Faults on the CDU:
1) Push the MENU function key on the left CDU to show the MENU
page.
2) Push the LSK adjacent to the <CMC prompt to show the CMC
MENU page.
3) Push the NEXT PAGE function key.
4) Push the LSK adjacent to the <EXISTING FAULTS prompt to
show the EXISTING FAULTS page.
(c) Push the NEXT PAGE function key on the CDU and make sure the
<34 FLIGHT MANAGEMENT prompt does not show.
(d) If the <34 FLIGHT MANAGEMENT prompt does show, then do these
steps:
1) Push the LSK adjacent to the <34 FLIGHT MANAGEMENT prompt
to show the EXISTING FAULTS MSG page.
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747-400 MAINTENANCE MANUAL
2) Use the NEXT PAGE function key on the CDU and make sure
that none of these messages show:
34739 FMC MASTER SWITCHING RELAY 1 FAIL (CMC)
34740 FMC MASTER SWITCHING RELAY 2 FAIL (CMC)
34741 FMC MASTER SWITCHING RELAY 3 FAIL (CMC)
(e) Push the LSK adjacent to the <RETURN prompt to show the
EXISTING FAULTS page.
(f) Push the LSK adjacent to the <RETURN prompt to show the CMC
MENU page.
(g) Set the FMC master switch, on the P2 EICAS control panel/FMC
switch, to the R position.
(h) Push the LSK adjacent to the <EXISTING FAULTS prompt to show
the EXISTING FAULTS page.
(i) Push the NEXT PAGE function key on the CDU and make sure that
the <34 FLIGHT MANAGEMENT prompt does not show.
(j) If the <34 FLIGHT MANAGEMENT prompt does show, then do these
steps:
1) Push the LSK adjacent to the <34 FLIGHT MANAGEMENT prompt
to show the EXISTING FAULTS MSG page.
2) Push the NEXT PAGE function key on the CDU and make sure
that none of these messages show:
34739 FMC MASTER SWITCHING RELAY 1 FAIL (CMC)
34740 FMC MASTER SWITCHING RELAY 2 FAIL (CMC)
34741 FMC MASTER SWITCHING RELAY 3 FAIL (CMC)
S 864-031
(10) Do the "Remove Electrical Power" task (Ref 24-22-00/201).
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747-400 MAINTENANCE MANUAL
FLIGHT MANAGEMENT COMPUTER BITE DATA DOWNLOAD - MAINTENANCE PRACTICES
_____________________________________________________________________
1. General
_______
A. This procedure has one task. This task is to do the download of the BITE history data from the Flight Management Computer (FMC) to a Data Loader. The BITE history data is a record of recent FMC fault. The BITE history data can also give sufficient data to find the cause of the fault. You must do the download procedure to supplement flight crew reports or maintenance crew observations of unusual FMC operation. To fully support such an investigation, it is necessary to get the BITE data from the left and right FMC.
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