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VOR/ILS NAVIGATION SYSTEM - ADJUSTMENT/TEST
EFFECTIVITY
GJ ALL EXCEPT B-2509 and B-2510
1. VOR/GS Navigation System Test
A. Equipment and Materials
(1) Ramp and Bench Test Set - Collins Type 972Q-4, or Instrument Flight Research Type NAV-401L
B. Prepare to Test System
(1)
Provide electrical power and energize panels P6 and P18.
(2)
Check that circuit breakers for following systems are closed: compass, flight director, instrument, interphone, and VOR/ILS navigation systems.
(3)
Position VHF NAV transfer switch to NORMAL. Check that captain's HSI nav data source annunciator indicates 1 and first officer's indicates 2.
(4)
Position NAV transfer switches to RADIO. Check that both HSI VOR/ILS/NAV annunciators indicate VOR/ILS.
(5)
Set selected course to 000.
(6)
Set compass system to indicate a heading of 0 degree.
(7)
Check that autopilot system is not in radio mode.
(8)
Select heading mode of operation for flight director mode selector.
(9)
Position RMI VOR/ADF switches to VOR.
C. Test VOR/ILS System
(1) Test VOR/ILS System Self-Test Function
(a)
Tune No. 1 VOR/ILS system to local VOR station and check that station identification code is audible over flight interphone system.
(b)
Select 108.0 MHz on captains VHF NAV control panel. Check that captain's ADI and HSI glide slope flags and pointers are out of view and that HSI VOR/LOC (NAV) flag is in view.
(c)
Actuate VOR self-test for No. 1 system while verifying following on captain's instruments: 1) HSI VOR/LOC and RMI narrow pointer flags remain in view for 3 seconds,
retract from view, and 20 +5 seconds after initiating test, reappear and remain in
view. 2) HSI course deviation bar is centered. 3) HSI to/from pointer indicates from. 4) Both VOR RMI narrow pointers indicate 180 +3 degrees.
(d)
Select 108.1 MHz on captain's VHF NAV control panel. Verify following on captain's instruments: 1) ADI and HSI glide slope flags and pointers appear. 2) RMI narrow pointers stow at 3 o'clock.
(e)
Actuate up/left ILS self-test for No. 1 system while verifying following on captain's instruments: 1) VOR/LOC, RUNWAY and GS flags remain in view for 3 seconds, retract from
view, and 20 +5 seconds after initiating, reappear and remain in view.
(f)
Repeat step (e) for down/right ILS self-test.
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(g) Repeat steps (a) thru (g) for the No. 2 VOR/ILS system.
(2)
Test VOR Flag Circuit Function
(a)
Tune No. 1 and 2 VOR/ILS systems to local station (use test set if station is not present or signal is not adequate).
(b)
Open VOR No. 1 circuit breaker. Check that captain's HSI VOR/LOC flag comes into view.
(c)
Close VOR No. 1 circuit breaker.
(d)
Position VHF NAV transfer switch to BOTH ON 1.
(e)
Open VOR No. 1 circuit breaker. Check that both HSI VOR/LOC flags appear.
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