Automatic Flight

Automatic Flight Systems:
  • Flight Mode Annunciator
  • Autopilot / Flight Director Mode Selector Panel
  • Attitude Director Indicator (FD)
  • Horizontal Situation Indicator
  • Yaw Damper
  • Gust Response Suppression
  • Low Range Radio Altimeter
  • Warning Flags for Channel C
  • Automatic Stabilizer Trim Lights
  • Autopilot Manual Control Module
  • Pilot's Control Wheel
  • Thrust Levers
  • Autothrottle
  • ILS Deviation Warning
  • Limitations


Pilot's Controls







Flight Mode Annunciator:


Flight Director Annunciators:   Indicates the selected and operating modes of the F/D
                





Autopilot Annunciators: Indicates the selected and operating modes of the A/P:
  • DUAL - Two A/Ps in COMMAND
  • TRIPLE - Three A/Ps in COMMAND. 
  • DUAL/TRIPLE - indicates armed (white) when one A/P is controlling the airplane 
  • DUAL/TRIPLE - indicates green when all A/Ps in COMMAND are engaged to the flight controls
  • TEST - Blue Indicator in view while the localizer test is in progress
  • FLARE - Indicates white when flare mode is armed and green during A/P flare.


ALT SEL, NAV, GS, and GO ARND Annunciators:
  • Are common to the F/Ds and A/Ps. 
  • They indicate black when mode is not selected, white when armed and green when captured.


Autothrottle Annunciators: See section on A/T

PTT Switches:  Provides a test signal to all annunciators


Autopilot / Flight Director Mode Selector Panel:






Flight Director Switch:
Controls output of FD computer to respective attitude director indicator (ADI)

Flight Director Pitch Control:
Provides pitch trim signal outputs to pitch command bar on ADI



Autopilot Engage Switches:

Permit selection of A or B (or C) autopilot for MANUAL or COMMAND operation
or
permit selection of any two or all three for COMMAND operation after specific interlock conditions have been satisfied.




Course Selector:

Rotation of the selector sets the desired course on the digital display and sets the course pointer on the HSI. 
Provides course error signals to autopilot/flight directors A, B and C and course signals to the No. 1 Nav Radio.


Heading Selector: 

Provides heading select signals to the HSIs and heading error signals to the autopilot and flight director computers.



Navigation Mode Switch:

INS - Used to couple the INS system to the AP/FD system.  Capture of the INS track starts 7.5 nautical miles from the track.
HDG - AP or FD coupled to a selected heading reference, as set by the HDG selector.
VOR LOC - Either VOR or localizer signals will arm the AP and/or FD for roll control, depending on the selected frequency.  Prior to course capture, control is referenced to the selected heading.  VOR capture varies with the intercept angle.

ILS - Selection of the ILS position will arm the AP (single channel only) and / or FD.  Capture of the localizer course is a function of airspeed and intercept angle.  Prior to course capture, control is referenced to the selected heading.  Glide slope intercept can be made from above or below the glide slope.  GS capture will be initiated at approximately 1/2 dot deviation.  Course transfer switch moves MULTI or DUAL position when ILS is selected.

LAND - For dual or triple channel autoland operation with flare and rollout modes.  Multi channel operation requires airplane to be on a glide slope and on the localizer below 1500 feet radio altitude (1000 feet on airplanes requiring the ILS/AUTOLAND Confidence Test during preflight).  Any two or all three AP engage switches must be in COMMAND position.   Course transfer switch moves to MULTI / DUAL position when LAND is selected.


Back Beam Switch:

For use with back course of a localizer (B/B light on).
 


Course Transfer Switch:
Three settings -

No. 1 - AP/FD Comput
ers A, B and C are referenced to No. 1 VHF Nav radio

No. 2 - AP/FD Computers A, B and C are referenced to No. 2 VHF Nav radio

MULTI / DUAL -
AP/FD Computer A is referenced to No. 1 VHF Nav radio.  Computer B is referenced to No. 2 VHF Nav radio.  Computer C is referfenced to No. 3 VHF radio after FLARE is armed.  Otherwise computer C is referenced to VHF Nav 1 radio.
Captain's VHF radio frequency selectors (No. 1) control the tuning of No. 3 VHF radio.  Will move to MULTI/DUAL automatically when ILS or LAND mode is selected.


Vertical Speed Control:

Used with Vertical Speed (V/S) mode to set a desired speed. 

When V/S is not selected the wheel is synchronized to follow the airplane vertical speed.





Speed Mode Switch:


Cannot be engaged after glide slope capture.


TURB - Used for turbulence penetration with AP in MAN only.  Provides reduced gain commands. 
FD roll commands in compatibli modes are retained.  Not effective with navigation mode switch in ILS or LAND.    Automatic stabilizer trim is effective.
V/S - Used in conjunction with vertical speed over a range of +4000 to -8000 feet per minute.  Can be selected with navigation mode switch in any position.
IAS - Provides for automatic pitch axis control referenced to the indicated air speed at the time of engagement.
MACH - Provides
for automatic pitch axis control referenced to the indicated mach at the time of engagement.


Altitude Mode Switch:

Altitude Selector:


Rotation of control sets the desired altitude of the indicator for altitude select altitude reference.


ALT HOLD - Provides for airplane to maintain the barometric altitude reference existing at the time of selection.  Can be selected with navigation mode switch in any position, but cannot be engaged after glide slope capture.  Speed mode switch must be off.

ALT SEL - Provides for intercept and capture of a selected altitude.  Capture can begin within 1200 feet of altitude.  Flight path may be set up by using pitch wheel control, vertical speed control or indicated airspeed mode or mach mode.  Speed mode switch will return to OFF when altitude is captured.




Attitude Director Indicator (FD)








Horizontal Situation Indicator:



Components:

Drift Angle Indicator
Heading Reference










Yaw Damper




Gust Response Suppression:

Beta Switch
Beta Not Engaged Light - Blue
MSAS Switch
MSAS
Not Engaged Light - Blue


Low Range Radio Altimeter:

Tape type




Dial Style




Warning Flags for Channel C


Automatic Stabilizer Trim Lights


Autopilot Manual Control Module:



Pilot's Control Wheel:





















Thrust Levers
 




Autothrottle




ILS Deviation Warning



Limitations:

Engage above: 1200’. 

Disconnect below: 50’.







Captain's control wheel

A/P disconnect, trim & PTT on left side

Clipboard for approach plates in centre of yoke










First Officer's control wheel


A/P disconnect, trim & PTT on right side

Aileron Trim scale on top centre




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