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SYSTEM ACCESSORY UNIT ú ú 05 Page 60 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
DME D30330D26317D30322
4
36
21
ILS TEST
SWITCH
P8-25 VHF NAV-1 CONT PNL (P8)
D30521
36
4
INTERNALS
SAME AS
VHF NAV-1
CONT PNL
22
D26517D305
30
P8-26 VHF NAV-2 CONT PNL (P8)
M1474 INTEGRATED FLT SYS ACC UNIT (E1-3)
VOR/ILS Self-Test SchematicFigure 15 (Sheet 2)
A
737-300/400/500MAINTENANCE MANUAL
(13) VOR Self-Test Pictorial (Fig. 16)
(a) Figure 16 is a pictorial presentation for system No. 1 showing control settings for VOR self-test preparation and the flight instrument displays for the VOR self-test. 1) The VOR test preparation and procedure described here is
for VOR/ILS navigation system No. 1. The test of system No. 2 is performed in the same way, using the controls and indicators for system No. 2.
2) Test Preparation a) Prior to testing system No. 1, the following switches and controls must be in the position indicated:
-VHF NAV Transfer Switch . . . . . . . . NORMAL
-IRS Transfer Switch . . . . . . . . . . NORMAL
-DFCS MSP: Course Selector No.1 . . . . 000
-RDDMI: VOR/ADF Switches . . . . . . . .VOR
-
IRS MSU: L and R Mode Selectors . . . .ATT
-
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 VOR frequency of 108.00 MHz on the VHF NAV control panel. Observe the VHF NAV status on the sensor status display on the flight management computer control display unit (FMC CDU). Check that VOR 1 and
108.00 are annunciated and that course deviation scale is displayed in the captain's EHSI. 3) Test Procedure
a) To initiate a VOR self-test, press and hold the TEST switch in the VOR position, and observe the following displays:
Captain's EHSI
______________ Deviation Bar . . . . . . *[1] To/From Display . . . . . FROM RDDMIs
______ No. 1 Pointer (VOR) . . . 180° (|3°) No. 1 Pointer Flags . . . *[2] FMC CDU
_______
VHF NAV Status. . . . . . TEST
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A 737-300/400/500MAINTENANCE MANUAL
*[1] Course deviation bar disappears for approximately 3 seconds, reappears centered for 23 |5 seconds after initiating test, and then disappears again for as long as VOR self-test is actuated.
*[2] Warning flags remain in view for 3 |1 seconds, disappear, and 20 |5 seconds after initiating test, reappear and remain in view for as long as self-test is actuated.
b) Release the TEST switch and verify all VOR indications return to normal.
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A 737-300/400/500MAINTENANCE MANUAL
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú
34-31-02
ú ú 05 Page 63 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(14) ILS Self-Test Pictorial (Fig. 17)
(a) Figure 17 is a pictorial presentation for system No. 1 ILS (up/left and down/right) self-test preparation and flight instrument display for the ILS self-tests. 1) The ILS self-test preparation and procedure described here
is for the VOR/ILS navigation system No. 1. The test of system No. 2 is performed in the same way, using the controls and indicators for system No. 2.
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