Boeing 737-800 - Page 628

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737 Flight Crew Operations Manual

Automatic Flight -

Controls and Indicators

4.10.12 D6-27370-866-EGP

The selected course can be intercepted while engaged in:

•LNAV

• HDG SEL

• CWS R if an autopilot is engaged in CMD.

The capture point is variable and depends on intercept angle and closure rate.

Localizer capture occurs not later than 1/2 dot deviation. Course capture is

indicated when VOR/LOC annunciation changes from armed to engaged.

While engaged in VOR or LOC modes:

• A autopilot and Captain’s F/D use information from Captain’s course

selector and No. 1 VHF NAV receiver

• B autopilot and First Officer’s F/D use information from First Officer’s

course selector and No. 2 VHF NAV receiver

• different courses and/or frequencies for two VHF NAV receivers can

cause disagreement between the Captain’s and First Officer’s F/D

displays and affect A/P operation.

Note: When a localizer frequency is selected, VHF NAV radios automatically

switch from tail antenna to nose antenna when VOR/LOC is annunciated

(armed or engaged). If antenna switching does not occur, LOC mode is

inhibited.

Note: Localizer backcourse tracking is not available.

6 Course Selector

Sets course in COURSE display for related VHF NAV receiver, AFDS and DU.

Two course selectors and COURSE displays are located on the MCP.

Rotate Captain’s course selector – provides selected course information to:

•A FCC

• No. 1 VHF NAV receiver

• Captain’s course pointer and course deviation bar.

Note: In VOR LOC or APP mode, the A A/P and Captain’s F/D use selected

course and navigation data from the No. 1 VHF NAV receiver.

Rotate First Officer’s course selector – provides selected course information to:

•B FCC

• No. 2 VHF NAV receiver

• First Officer’s course pointer and course deviation bar.

Note: In VOR LOC or APP mode, B A/P and First Officer’s F/D use selected

course and navigation data from No. 2 VHF NAV receiver.

September 15, 2016

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