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selector and No. 1 VHF NAV receiver
· B autopilot and First Officer F/D use information from First Officer
course selector and No. 2 VHF NAV receiver
· Different courses and/or frequencies for two VHF NAV receivers can
cause disagreement between the Captain and First Officer F/D displays
and affect A/P operation.
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.
A 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.
AUTO FLIGHT
Sec. 6.4 Page 46 737
Rev. 11/15/02 #41 Continental Flight Manual
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.
· In VOR LOC or APP mode, the A A/P and Captain 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 F/D use selected
course and navigation data from No. 2 VHF NAV receiver.
B Bank Angle Selector
Rotate –
· Sets maximum bank angle for AFDS operation in HDG SEL or VOR
modes
· Commanded bank angle can be selected at 10, 15, 20, 25, or 30
degrees.
C Heading Select (HDG SEL) Switch
Push –
· Engages HDG SEL command mode
· Commands roll to follow selected heading
· Annunciates HDG SEL as FMA roll mode and illuminates HDG SEL
switch light.
Heading Select Command Mode
The HDG SEL mode commands roll to turn to and maintain heading shown in
MCP HEADING display:
· Initial selection commands turn in shortest direction toward selected
heading bug
· After mode engagement, roll commands are given to turn in same
direction as rotation of heading selector
AUTO FLIGHT
737 Sec. 6.4 Page 47
Flight Manual Continental Rev. 11/15/02 #41
· Bank angle limit is established by bank angle selector
· HDG SEL mode automatically disengages upon capture of selected radio
course in VOR LOC and APP modes (VOR/LOC armed).
> Always turns to the nearest direction to each selected heading.
D Approach (APP) Switch
Push –
· Illuminates APP switch light
· Arms the AFDS for localizer and glideslope capture
· Roll mode annunciates VOR/LOC armed
· Pitch mode annunciates G/S armed
· Enables engagement of both autopilots.
APP Mode
The approach mode arms AFDS to capture and track localizer and
glideslope and can be engaged for dual or single autopilot operation.
One VHF NAV receiver must be tuned to an ILS frequency before
approach mode can be engaged. With one VHF NAV receiver tuned,
oneside AFDS is enabled for guidance and operation.
For dual autopilot operation, both VHF NAV receivers must be tuned to
the ILS frequency and both autopilots must be selected in CMD prior to
800 feet RA.
APP mode operation:
· Localizer must be captured prior to glideslope
· Localizer can be intercepted in HDG SEL, LNAV, or CWS R
· 1 CH annunciates in A/P Status Display after localizer capture
- For single autopilot approach, 1 CH remains annunciated for entire
approach
- For dual autopilot approach, 1 CH annunciation extinguishes when
second autopilot engages and FLARE armed is annunciated
· Glideslope capture occurs at 2/5 dot below glideslope
· APP switch light extinguishes after localizer and glideslope capture.
AUTO FLIGHT
Sec. 6.4 Page 48 737
Rev. 11/15/02 #41 Continental Flight Manual
After localizer and glideslope capture, APP mode can be disengaged by:
· Pushing a TO/GA switch
· Disengaging autopilot(s) and turning off both F/D switches
· Retuning the VHF NAV receiver.
While engaged in the APP mode:
· The A autopilot and Captain F/D use information from Captain Course
Selector and No. 1 VHF NAV receiver
· The B autopilot and First Officer F/D use information from First
Officer Course Selector and No. 2 VHF NAV receiver
· Different courses and/or frequencies for the two VHF NAV receivers
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737 FLIGHT MANUAL 737飞行手册3(81)
