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A 737-300/400/500MAINTENANCE MANUAL

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT EFIS ú

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A
737-300/400/500MAINTENANCE MANUAL
 (12) VOR/ILS Self-Test Schematic (Fig. 15)
 (a)  
Figure 15 shows an interface schematic for the VOR/DME and ILS self-test circuits.

 (b)  
The VOR and ILS self-tests are inhibited by relays in the flight instrument accessory unit when the DFCS is operating in an approach mode. Actuation of a VOR, UP/LT or DN/RT self-test interrupts the flight management system interlock circuit. The ILS UP/LT self-test is also initiated during the VHF NAV interface test of the DFCS BITE operation.

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TO DME-1(34-55-00) VHF NAV UNIT-1VOR TO LOC ANT XFRFROM FIG.10

LRRA-1 TESTINHIBIT(34-48-00) D235A

D235A 123
61
73

122114117
113124115
78 79

 AND K13)(SAME AS K12K14 AND K15VOR/ILS-2TEST INHIBITAND ANTENNAXFR RELAYS
 

M160 FLT INSTR ACC UNIT (E1-2) M1164 DAA-2 (E1-2)

FROM FIG. 13
VOR/LOC-1 28V DCFROM FIG. 9

22 87
88

TO DME-2(34-55-00) 30
17

P8-26 VHF NAV-2 CONT PNL (P8)
VOR/ILS Self-Test SchematicFigure 15

A
737-300/400/500MAINTENANCE MANUAL
 (13) VOR Self-Test Pictorial
 (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
 must be in the position indicated: VHF NAV Transfer Switch . . . . . . NORMAL CAPT'S HSI Transfer Switch. . . . . VOR/ILS Course Select No. 1 . . . . . . . . 000
 b)  Next, select a VOR frequency of 108.00 MHz on the VHF NAV control panel. Observe the VOR status on the sensor status display on the flight management computer control display unit (FMC CDU).
 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 HSI

_____________ Deviation Bar . . . . . . Centered To/From Flag. . . . . . . FROM Nav Flags . . . . . . . . *[1] RDDMIs
______ No. 1 Pointer (VOR) . . . 180° (|3°) No. 1 Pointer Flags . . . *[1] FMC CDU
_______
 VHF NAV Status. . . . . . OK

 *[1]  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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