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Overspeed or underspeed limiting symbol appears when commanded speed
cannot be reached.
Underspeed limiting (flashing character A) – minimum speed
Overspeed limiting (flashing character 8) –
· Vmo or Mmo limit
· Landing gear limit
· Flap limit.
@ IAS/MACH Display
Displays speed selected by IAS/MACH selector
· Display is blank when:
- VNAV mode engaged
- A/T engaged in FMC SPD mode
- During 2 engine AFDS go-around
· Displays 100 / 110 knots when power is first applied (as installed)
· Display range is:
- 100 / 110 KIAS – Vmo in 1 knot increments (as installed)
- .60M – Mmo in .01M increments.
A N1 Switch
Push – (light ON not illuminated)
· Engages A/T in N1 mode if compatible with AFDS modes already
engaged
· Illuminates N1 switch light
· Annunciates N1 autothrottle mode.
Push – (light ON illuminated)
· Deselects N1 mode and extinguishes switch light
· Engages autothrottles in ARM mode.
AUTO FLIGHT
Sec. 6.4 Page 36 737
Rev. 11/15/02 #41 Continental Flight Manual
N1 Mode
· A/T maintains thrust at N1 limit selected from FMC CDU. N1 mode
engaged manually by pushing N1 switch if N1 mode is compatible with
existing AFDS modes. N1 mode engages automatically when:
- Engaging LVL CHG in climb (except during inhibit period for 2
1/2 minutes after lift-off)
- Engaging VNAV in climb.
B SPEED Switch
Push – (light ON not illuminated)
· Engages A/T in SPEED mode if compatible with engaged AFDS modes
· Illuminates SPEED switch light
· Annunciates MCP SPD autothrottle mode
· Maintains speed in MCP IAS/MACH display.
Push – (light ON illuminated)
· Deselects speed mode and extinguishes switch light
· Engages A/T in ARM mode.
Speed Mode
Autothrottle holds speed in IAS/MACH display or a performance or limit
speed. Speed mode engaged manually by pushing SPEED switch if speed
mode is compatible with existing AFDS modes. Speed mode engages
automatically when:
· ALT ACQ engages
· ALT HOLD engages
· V/S engages
· G/S capture occurs.
A/T does not set thrust above displayed N1 limit, however, A/T can exceed
N1 value manually set by N1 manual set knob.
C Speed Selector
Rotate –
· Sets speed in IAS/MACH display and positions airspeed cursor
· Selected speed is reference speed for AFDS and A/T
· Not operative when IAS/MACH display is blank.
AUTO FLIGHT
737 Sec. 6.4 Page 37
Flight Manual Continental Rev. 11/15/02 #41
Vertical Navigation
< VNAV Switch
Push –
· VNAV switch light illuminates
· Pitch mode annunciates VNAV SPD, VNAV PTH
· A/T mode annunciates FMC SPD, N1, RETARD, or ARM
· IAS/MACH display blanks and airspeed cursors positioned to FMC
commanded airspeed.
VNAV Mode
The FMC commands AFDS pitch and autothrottle to fly vertical profile
selected on FMC CDUs. Profile includes climb, cruise, descent, speeds,
and can also include waypoint altitude constraints.
If the aircraft is between the FMC target altitude (depicted on the RTE
LEGS page for the active waypoint) and the manually entered MCP target
altitude, VNAV will not engage. To enable VNAV, adjust the FMC or
MCP target altitude as appropriate.
Climb –
· Autothrottle holds FMC thrust limit
· AFDS holds FMC target speed
· Automatic level-off occurs at MCP altitude or VNAV altitude,
whichever is reached first
· VNAV constrained level-off annunciates VNAV PTH.
AUTO FLIGHT
Sec. 6.4 Page 38 737
Rev. 11/15/02 #41 Continental Flight Manual
Cruise –
· Autothrottle holds FMC target speed
· AFDS holds FMC altitude
· Selecting a lower MCP altitude arms FMC to automatically begin
descent upon arrival at FMC top of descent point.
Descent –
· VNAV SPD descent
- Autothrottle holds idle
- AFDS holds FMC target speed.
· VNAV PTH descent
- Autothrottle holds idle but can command FMC SPD mode if ground
speed becomes too low to maintain FMC vertical path
- AFDS tracks FMC descent path.
· Automatic level-off occurs at MCP altitude or VNAV altitude,
whichever is reached first
- VNAV constrained altitude annunciates VNAV PTH.
Inhibited below 400 ft RA or if performance initialization not complete.
VNAV mode is terminated by any one of the following:
　
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本文鏈接地址：737 FLIGHT MANUAL 737飛行手冊3(78)