Boeing 737-800 - VHF Navigation Control

737 Flight Crew Operations Manual
Flight Management, Navigation -
Controls and Indicators
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11.10.22 D6-27370-866-EGP
VHF Navigation Control
1 Frequency Indicator
Indicates the frequency selected by the frequency selector
• tuned frequency displayed in STANDBY display
• TFR switch moves STANDBY frequency to ACTIVE frequency.
2 TEST Switch
With a VOR frequency tuned and a course of 000 selected:
• shows VOR fail flag
• deviation bar biases out of view and then returns to centered position
• bearing pointer slews to 180 degrees
• DME displays:
•DME fail flag
• dashes
• normal DME distance.
With ILS frequency tuned and a course within 90 degrees of airplane heading:
• pointers disappear and LOC and G/S flags appear momentarily
• pointers appear and display one dot up and one dot left
• pointers then display one dot low and one dot right
• pointers then return to normal display
• DME displays:
•DME fail flag
• dashes
• normal DME distance.
ACTIVE
STANDBY
N
V
A
TEST
TFR
AFT ELECTRONIC PANEL
1
2
3
4
September 15, 2016