1) P18 Panel
a) FMCS CDU No. 1
NOTE: On airplanes with provisions for dual FMC, FMCS CDU
____ (ANCDU, MCDU) No. 2 circuit breaker will be on the P6-1 panel.
b) FMC (or FMCS CMPTR)
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737-300/400/500MAINTENANCE MANUAL
c) AIRPLANES WITH DUAL FMC;
FMCS CMPTR No. 2
FMCS XFER
S 742-018
(2)
Do the keyboard test:
(a)
Show the MAINT BITE INDEX 1/1 page on the CDU.
1) Push the INIT REF key on the CDU keyboard.
2) Push the LSK adjacent to <INDEX.
3) Push the LSK adjacent to <MAINT.
(b)
Push the LSK adjacent to <FMCS.
(c)
Push the LSK adjacent to <CDU TEST.
(d)
Push the LSK adjacent to <KEY TEST. Make sure that the CDU display shows the legends of all the keys the same as on the CDU keyboard.
(e)
Push each key on the CDU. Make sure that the same key legend on the CDU display comes on.
(f)
When all the keys are pushed, make sure all the key legends on the CDU display come on.
(g)
Push the LSK adjacent to <INDEX to go back to FMCS BITE 1/1 page.
(3)
Remove electrical power if it is not necessary (Ref 24-22-00/201).
S 862-019
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737-300/400/500MAINTENANCE MANUAL
FMCS CONTROL DISPLAY UNIT - SERVICING
_____________________________________
1. General (Fig. 301)
_______
A. This procedure contains three tasks. The first task is the replacement of the lamp for the DSPY/FAIL and MSG/OFST annunciators. The second task is the replacement of the lamp for the EXEC annunciator. The third task is the CDU annunciator lamp test.
B. You can find the FMCS control display units (CDU) in the flight compartment on the forward electronic panel, P9. The CDU has five annunciators: DSPY, FAIL, MSG, OFST, and EXEC. Two of the annunciators are on the left of the CDU (DSPY/FAIL), and two are on the right of the CDU (MSG/OFST). These four annunciators use two lamps soldered on an annunciator circuit board assembly. You can find the EXEC annunciator on the right side of the CDU. This annunciator has a lamp assembly with two lamps and a lamp holder.
TASK 34-62-11-963-031
2. DSPY/FAIL, MSG/OFST Annunciator Replacement (Fig. 301)
___________________________________________
A. Access
(1) Location Zones
101 Control Cabin, Left
102 Control Cabin, Right
B. DSPY/FAIL, MSG/OFST Annunciator Replacement
S 863-002
(1) Open this circuit breaker and attach DO-NOT-CLOSE tag:
(a) P18-2 Panel
1) FMCS CDU No. 1
NOTE: On airplanes with provisions for dual FMC, FMCS CDU
____ (ANCDU, MCDU) No. 2 circuit breaker will be on the P6-1 panel.
S 023-003
(2) Remove the lamp assembly:
(a)
Remove the two screws and lockwashers that hold the legend plate to the CDU.
(b)
Remove the legend plate to get access to the Annunciator Circuit Board Assembly (lamp assembly).
NOTE: Each lamp assembly has two lamps.
____
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737-300/400/500
MAINTENANCE MANUAL
LIGHTED SWITCH PANEL
LAMP ASSEMBLY
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