(c)
Actuate VOR self-test for No. 1 system while verifying following on captain's instruments: 1) HSI NAV flag and RDDMI narrow pointer flags retract from view after 3 seconds. 2) HSI course deviation bar is centered. 3) HSI to/from pointer indicates from.
4) Both VOR RDDMI narrow pointers indicate 180 士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) VOR RDDMI narrow pointers stow at 3 o'clock.
5C8
Feb 01/95 34-31-01 Page 501
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(e)
Actuate up/left ILS self-test for No. 1 system while verifying following on captain's instruments: 1) HSI NAV flag, ADI RUNWAY flag and ADI and HSI GS flags retract from view
after 3 seconds. 2) HSI course deviation bar and ADI localizer pointer move one dot left. 3) ADI and HSI glide slope pointers move one dot up.
(f)
Repeat step (e) for down/right ILS self-test.
(g)
Repeat steps (a) thru (f) 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 NAV flag comes into view.
NOTE: The RDDMI pointer flags will appear when the HSI NAV flags are in view during the VOR flag circuit function test.
(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 NAV flags appear.
(f)
Close VOR No. 1 circuit breaker. Check that both HSI NAV flags disappear from view.
(g)
Position VHF NAV transfer switch to BOTH ON 2.
(h)
Open VOR No. 2 circuit breaker. Check that both HSI NAV flag appears.
(i)
Close VOR No. 2 circuit breaker.
(3)
Test VOR/ILS Transfer Switching Function
(a)
Position VHF NAV transfer switch to BOTH ON 1 and repeat VOR/ILS self-test of par. C.(1) for No. 1 VOR/ILS system. Check that both HSI nav system annunciators indicate 1 and that captain's and first officer's self-test displays are the same.
(b)
Position VHF NAV transfer switch to BOTH ON 2 and repeat VOR/ILS system self-test of par. C.(1) for No. 2 VOR/ILS system. Check that both HSI nav system annunciators indicate 2 and that captain's and first officer's self-test displays are the same.
(c)
Position VHF NAV transfer switch to NORMAL. Check that captain's HSI nav system annunciator indicates 1 and first officer's indicates 2.
(4)
Test VOR Function
(a)
Operate signal generator to supply a 0-degree omniradial (180-degree omni bearing) test signal on 108.0 MHz with audio modulation of 1020 Hz.
NOTE: A radial specifically means the signal as it exists along a line in a magnetic direction from the station as specified by the number of the radial. (For example, 0-degree radial is north of the station, and 90-degree radial is east of the station.)
(b)
Check that audio tone is not available when signal generator and receiver are at different frequencies.
(c)
Check that compass system indicates a heading of zero degrees.
(d)
Tune No. 1 VOR/ILS system to 108.0 MHz. Check that VOR RDDMI narrow pointers indicate a magnetic bearing of 180 士3 degrees and that ADI and HSI glide slope flags and pointers are out of view.
(e)
Turn captain's course selector knob until HSI course deviation bar is centered. Check that captain's HSI course counter indicates 000 士2 degrees and that course deviation bar is parallel to VOR RDDMI narrow pointers.
(f)
Rotate captain's course selector until course deviation bar is over second left dot. Check that course counter indicates 350 士4 degrees.
(g)
Rotate captain's course selector until course deviation bar is over second right dot. Check that course counter indicates 010 士4 degrees.
(h)
Rotate captain's course selector until course counter indicates 000 degrees.
(i)
Set signal generator to transmit 315-degree radial (135-degree bearing). Check that VOR RDDMI narrow pointers indicate a magnetic bearing of 135 士3 degrees and that captain's HSI course deviation bar is deflected full-scale right and FROM flag comes into view.
(j)
Repeat step (i) for left deflection using 45-degree test radial (225-degree bearing). Check that VOR RDDMI narrow pointers indicate 225 士3 degrees and that captain's HSI course deviation bar deflects full scale left.
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