-
IRS ISDU: Press "H" and enter heading of 000
-Left and Right EFIS Control Panels: HSI Mode Selectors . . . . . . . . FULL VOR/ILS
-VHF NAV Control Panels: AUTO/MANUAL Switch/Indicator . . . . . .MANUAL
b) Next, select a localizer frequency of 108.10 MHz on the VHF NAV control panel. Observe the VHF NAV status on the sensor status display on the FMC CDU. Check that captain's EADI and EHSI glide slope and localizer scales appear; that ILS 1 and 108.10 are annunciated in captain's EHSI; and that RDDMI No. 1 (narrow) pointers are parked at 90 degrees.
3) Test Procedure
a) To initiate the ILS up/left self-test, press and hold the TEST switch in the UP/LT position, and observe the following displays:
Captains EADI and EHSI
______________________
Glide Slope Pointer. . . . . . . . . . *[1]
Localizer Pointer. . . . . . . . . . . *[1]
FMC CDU
_______
VHF NAV Status . . . . . . . . . . . . TEST
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A 737-300/400/500MAINTENANCE MANUAL
*[1] Captain's EADI and EHSI glide slope and localizer pointers out of view for 3 seconds; then in view displaying 1 dot up and 1 dot left deviation for 23 |5 seconds; then out of view again for as long as UP/LT self-test is actuated.
b) Release the TEST switch and verify all ILS indications return to normal.
c) Perform the test again with the switch in the DN/RT position. The indications are similar to UP/LT test, but this time the localizer pointers drive right 1 dot, and the glide slope pointers drive down 1 dot.
d) Repeat the VOR and ILS self-tests with the VHF NAV transfer switch in BOTH ON 1 position and then in BOTH ON 2 position. Test displays should appear on both the captain's and first officer's instruments.
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A 737-300/400/500MAINTENANCE MANUAL
127
DME13.5 HDG
M
ADI HSI EXP
RANGE
VOR/80160 320
DH REF 40 NAV ILS
TEST
VOR/MAP
40
20TFC
ILS UP/LT
FULLCTR 10
PITCH ROLL
NAV MAP
BRT
PLAN WXR DN/RTON
VHF NAV/DME-1 20
ILS 1 108.10
RST
CONTROL PANEL CAPTAIN'S EADI
MAP
VOR/ADF NAV AID ARPTRTE DATAWPT
CAPTAIN'S EHSI
BRT ON ON
ON ON ON
FMCS SENSORS
EFIS CONTROL PANEL
LRU LEFT VHF NAV TEST DME OK
FMC-CDU
MANUAL
ILS TEST PROCEDURE (UP/LEFT) 127
DME13.5 HDG
M
TEST 40
VHF NAV/DME-1
UP/LT
CONTROL PANEL
PITCH ROLLDN/RT
DME-1 DME-2DME-1 DME-2
VHF NAV/DME-1
20
CONTROL PANEL ILS 1 108.10
CAPTAIN'S EADICAPTAIN'S EHSI
FMCS SENSORS
LRU LEFT
VHF NAVOK
DME K
FMCS SENSORS
LRU LEFT
FMC-CDU CAPTAIN'S RDDMI FIRST OFFICER'S RDDMI
VHF NAV TESTDME OK
FMC-CDU
ILS TEST PROCEDURE (DOWN/RIGHT)
ILS Self-Test Pictorial
Figure 17
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A
737-300/400/500MAINTENANCE MANUAL
VOR/ILS NAVIGATION SYSTEM - TROUBLESHOOTING
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