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 D.  The VOR/LOC antenna switches are fail safe units, which if faulty can cause weak VOR reception. If only one system reception is weak, swap antenna switches to see if the problem follows the switch. Also check the antenna switching logic. Check that the rf distribution system coaxial connectors are properly connected. Cross-threaded or loose connectors cause weak rf reception. Compare the VOR test signal levels required to pull the warning flags from view in the flight instruments. Also compare the localizer test signal levels required for flag retraction (Ref 34-31-00, System Test).
 NOTE: Do not compare VOR vs LOC test signal levels.
____
 CAUTION: DO NOT ACTIVATE A "GLIDE SLOPE ANT TEST" SWITCH ON PANEL P2 IF
_______ A GLIDE SLOPE ANTENNA SWITCHING FAILURE HAS BEEN REPORTED (G/S-1 ANT, G/S-2 ANT OR G/S-3 ANT ANNUNCIATOR ON PANEL P2 ILLUMINATED). REFER TO 34-31-12, GLIDE SLOPE ANTENNA SYSTEM -TROUBLE SHOOTING, FOR THE PROPER FAULT ISOLATION PROCEDURE TO PREVENT POSSIBLE FURTHER DAMAGE TO AUTOPILOT ACCESSORY BOXES.
 2.  Prepare for Trouble Shooting____________________________
 A.  Verify that all circuit breakers on the STANDBY BUS, ESS FLT INST BUS and FLT INST BUS NO. 2 on panel P7 and the MISC bus on panel P12 are closed.
 EFFECTIVITY

 AT ALL; AZ ALL; IB ALL;  CONFIG 2 SN ALL  06 Page 101  Dec 25/83

34-31-00
 B.  Place AP/FD mode select panel switches and controls as follows: Course Transfer - DUAL MAV Mode Select - HDG All Others - OFF COURSE Counters - 000
 C.  On XA ALL EXCEPT SN 351-399, position power control knobs (VHF NAV control panels) to VOR/ILS.
 D.  On SN 351-399, select MAN mode of operation on VHF NAV control panels.
 E.  Position captain's VOR/ILS transfer switch (P1 panel) to CAPT 1 F/O 2.
 F.  Position both VOR/ILS-INS switches (P10 panel) to VOR/ILS.
 G.  Place flight controller TURN knob in detent position.
 H.  Place STANDBY POWER switch (P4 panel) to NORMAL or OFF position.
 I.  Check that STANDBY IGNITION switch (P5 panel) is in NORM position.
 J.  Provide electrical power Ref 24-22-00, Maintenance Practices (Apply Power).
 EFFECTIVITY

 AT ALL; AZ ALL; IB ALL;  CONFIG 2 SN ALL  03 Page 102  Apr 25/86

34-31-00

Close VOR 1 DC and VOR 2 DC circuit breakers on P7 and select a frequency of
108.00 MHz on captain's VHF NAV control panel. Actuate VOR self-test on captain's
VHF NAV control panel while verifying following on captain's instruments:
For Collins 51RV-2B VOR/ILS receivers,
HSI nav flag remains in view for up to 9 seconds, retract from view, and 20 |5
seconds after initiating test, reappears and remains in view.
For Bendix RNA-34A or Collins 51RV-4B VOR/ILS receivers,
HSI nav flag remains in view for up to 3 seconds, retract from view, and 20 |5
seconds after initiating test, reappears and remains in view.
For King Radio KNR 6030 VOR/ILS receivers,
HSI nav flag remains in view for 3 |1 seconds, then retracts and remains out of
view.

IF -
OK

EFFECTIVITY
CONFIG 2 AT ALL; AZ ALL; IB ALL; SN ALL
799 Page 103
34-31-00
 Aug 25/85

 T55067
EFFECTIVITY CONFIG 2 AT ALL; AZ ALL; IB ALL; SN ALL;
799 Page 104
34-31-00
Apr 25/81

T55068
EFFECTIVITY
CONFIG 2 AT ALL; AZ ALL; IB ALL; SN ALL
799 Page 105

34-31-00
 Aug 25/85

NOT OK - Replace captain's instrument displaying faulty response (RMI, 34-21-06; ADI, 34-41-05; HSI, (34-41-06) and perform specified test.

OK VOR/ILS AUDIO FAULTY - Replace applicable VOR/ILS re-

NOT OK
ceiver (34-31-02) and perform specified test. IF VOR/ILS audio is still faulty, trouble shoot flight interphone system (23-51-00).
NOT OK

OK

SYSTEM IS OK - If localizer rf reception is questioned, trouble shoot localizer antenna circuits per PROCEDURE 3. If glide slope rf reception is questioned, perform glide slope antenna system trouble shooting per 34-31-12.
T55069
EFFECTIVITY
CONFIG 2 AT ALL; AZ ALL; IB ALL; SN ALL;
799 Page 106
34-31-00
 Apr 25/81
PROCEDURE 1

NOTE: Refer to Wiring Diagram Manual for wiring details.
EFFECTIVITY
CONFIG 2 AT ALL; AZ ALL; IB ALL; SN ALL;
799 Page 107

34-31-00
Apr 25/81
T55070
PROCEDURE 2

NOTE: Refer to Wiring Diagram Manual for wiring details.

T55071
EFFECTIVITY
CONFIG 2 AT ALL; AZ ALL; IB ALL; SN ALL;
799 Page 108
34-31-00
Apr 25/81
PROCEDURE 3

NOTE: Refer to Wiring Diagram Manual for wiring details.
　
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