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A 737-300/400/500MAINTENANCE MANUAL
MOUNTING HINGED MOUNTING SCREW HINGED MOUNTING
SENSOR
EHSI EHSI
(FRONT VIEW) (SIDE VIEW)
AIR
COOLING SCREENS INLET
EHSI (REAR VIEW)
Electronic Horizontal Situation Indicator (EHSI)
Figure 401
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A
737-300/400/500MAINTENANCE MANUAL
S 864-024
(5) Close these circuit breakers and remove the DO-NOT-CLOSE tags:
(a)
P6 Circuit Breaker Panel
1) F/O EHSI
2) EFIS SYM GEN R
(b)
P18 Circuit Breaker Panel
1) CAPT EHSI
2) EFIS SYS GEN L
S 864-038
(6) Make sure these circuit breakers are closed:
(a)
P6 Circuit Breaker Panel
1) EFIS CONT PANEL R
2) LANDING GEAR AIR/GND RELAY & LIGHTS
(b)
P18 Circuit Breaker Panel
1) EFIS CONT PANEL L
2) FMCS CMPTR
3) CDU NO. 1
4) CDU NO. 2
5) MODE ANN (or FMCS BITE)
S 864-027
(7) Make sure the EFI transfer switch on the pilots' overhead panel, P5, is in the NORMAL position.
E. EHSI Test
S 744-028
(1)
Push the INIT/REF key on the FMCS CDU.
S 744-029
(2)
Push the line select key (LSK) 6L (<INDEX) on the FMCS CDU.
S 744-030
(3)
Push the LSK 6R (MAINT>).
(a) Make sure the FMCS CDU display shows the MAINT BITE INDEX 1/1 page.
S 744-031
(4)
Push the LSK 5L (<EFIS).
(a) Make sure the FMCS CDU display shows the EFIS BITE TEST page.
(5)
Push the LSK 3L (<SELF TEST).
S 864-033
(6)
Set the mode switch on the EFIS control panel to the PLAN position.
S 744-032
(a) Make sure the related EHSI display shows the PLAN mode test pattern.
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737-300/400/500MAINTENANCE MANUAL
S 864-034
(7) Set the mode switch on the EFIS control panel to the MAP position.
(a) Make sure the related EHSI display shows the MAP mode test pattern.
S 744-035
(8) Push the INIT REF key on the FMCS CDU to get out of the EFIS BITE.
F. Put the Airplane Back to Its Usual Condition
S 864-036
(1)
Remove equipment cooling if it is not necessary (AMM 21-58-02/501).
S 864-037
(2)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
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A
737-300/400/500MAINTENANCE MANUAL
EFIS SYMBOL GENERATOR - MAINTENANCE PRACTICES
1. General
_______
A. This procedure contains this task:
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