(4)
VOR ground station bearing is displayed by the RDDMI bearing pointers. The narrow pointer displays VOR-1 bearing while VOR-2 bearing is displayed by the wide pointer. The RDDMI pointer flags are biased out of view when the VOR bearing is valid. Tuning to an ILS frequency parks the associated pointer at the 3 o'clock position. The VOR bearing displays are inhibited (frozen) with the pointer flags in view when the FMC and DME systems are operating in the autotune mode with DME agility enabled.
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(5)
Selecting an ILS frequency enables the ADI and HSI localizer and glide slope displays for making an instrument landing approach.
(6)
Localizer deviation is displayed by the ADI runway symbol and the HSI course deviation bar which move laterally across a scale to show airplane deviation from the localizer beam.
(7)
Glide slope information is displayed by the glide slope pointer in the ADI and the vertical pointer in the HSI. The pointers remain horizontal and move vertically across the scale to show airplane deviation about the glide path.
(8)
When the system is tuned to a VOR frequency, the ADI and HSI glide slope (VERT) flags and pointers and the ADI RUNWAY flag and symbol are biased out of view.
(9)
The VOR/LOC super flag signals control the respective ADI RUNWAY, HSI nav and RDDMI pointer warning flags.
(10)
The glide slope super flag signals control the respective ADI and HSI VERT warning flags.
(11)
A system self-test feature is controlled by the test switches on the VHF NAV control panel.
(12)
For VOR test, a VOR station is tuned in and a course of zero degrees is selected. When the VOR self-test is actuated, test displays on the associated instruments are as follows:
(a)
HSI course deviation bar centered.
(b)
HSI to/from display indicates from
(c)
Associated RDDMI pointer drives to 180 |3 degrees with respect to indicator compass card.
(d)
Associated RDDMI pointer flags and HSI nav flag remain in view for 3 |1 seconds, retract from view, and 20 |5 seconds after initiating test, reappear and remain in view.
(13)
If during the VOR self-test, the HSI course arrow is positioned 5 degrees on either side of the selected course, the course deviation bar will deflect to the appropriate first dot position on the course deviation scale.
(14)
For an ILS self-test, an ILS frequency is selected on the VHF nav control panel and either the up/left or the down/right self-test is actuated in turn. Selecting either an up/left or down/right ILS self-test causes the ADI and HSI glide slope (vertical) pointers to deflect up or down and the ADI runway symbol and the HSI course deviation bar to deflect left or right. The HSI nav and VERT flags and the ADI RUNWAY and GS flags will remain in view for 3 |1 seconds retract from view, and 20 |5 seconds after initiating test, reappear and remain in view.
NOTE: If the DFCS is in an approach mode, VOR/ILS self-tests are
____
inhibited.
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VOR/ILS Navigation System Block Diagram
Figure 3 (Sheet 1)
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