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600
800
29.92 IN
P604_04_060
AUTOMATIC FLIGHT CONTROL SYSTEM
4-44 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
Flight Level Change Mode
Flight Level Change mode (FLC) generates commands to maintain either the airspeed/
Mach reference value, or a 100 ft/min vertical speed toward the preselected altitude,
whichever yields the greater closure rate to the preselected altitude.
Pushing the FLC button selects Flight Level Change mode. A green FLC annunciation
is displayed in the active vertical field of the FMA, and ALTS is automatically armed
to capture the preselected altitude.
When FLC mode is selected manually, or by the FMS, the airspeed/Mach reference
displayed on the PFDs (speed bug) is automatically set to the aircraft’s current
airspeed/Mach. The airspeed/Mach reference is also synchronized to the aircraft’s
current airspeed/Mach when the autopilot is engaged with the active vertical mode in
FLC. The airspeed/Mach reference can be manually adjusted using the SPEED knob
on the FCP.
Automatic transition between IAS and Mach airspeed reference occurs at 33,600 feet
MSL. Mach reference automatically selects when the airplane climbs through 33,600
feet MSL and IAS reference automatically selects when the airplane descends through
33,600 feet MSL.
FLC mode is cleared by:
• pushing the FLC button
• selecting another vertical mode, or
• capturing an armed vertical mode
FLC Overspeed Protection Mode
The FCCs incorporate an overspeed protection mode to limit the aircraft indicated
airspeed/Mach from exceeding Vmo/Mmo. Overspeed protection is applied with the
flight directors off, and in any active vertical flight director mode except GS, ALTS or
ALT.
FLC overspeed mode is activated automatically in the event of an overspeed
condition; when the airspeed is 10 KIAS above Vmo or Mach number is 0.015 M
above Mmo. When FLC overspeed mode is active, a flashing yellow FLC
annunciation is displayed in the active vertical field of the FMA. The flight directors,
if not in view, automatically appear and provide pitch commands to reduce airspeed 5
knots below Vmo or 0.02 Mach below Mmo. FLC overspeed mode is automatically
cleared when this airspeed/Mach reference is reached. The vertical mode will revert to
FLC mode when the FLC overspeed mode is cleared.
AUTOMATIC FLIGHT CONTROL SYSTEM
For Training Purposes Only
Sept 04
4-45
P I LOT T R A I N I N G GU I D E
FLC overspeed mode cannot be cleared by pressing the FLC
button. As well, the flight directors cannot be selected off during
FLC overspeed mode operation.
Flight Level Change Mode
Figure 4-33
FLC Overspeed Protection Mode
Figure 4-34
NOTE
7000
12000 1.1
10
20
10
MDA
A A
A
HDG
LNV1
DR FLC
ALTS
AP
2500M 4
4
2
2
1
1
M.464
280
240
220
250
260
10
900
700
600
800
29.92 IN
P604_04_059
7000
9000 1.1
10
10
20
A A
A
HDG
LNV1
DR FLC
ALTS
AP
2500M 4
4
2
2
1
1
M.656
400
360
340
343
380
10
700
500
400
600
29.92 IN
P604_04_064
Vmo
Exceedance
FLC Overspeed
Protection Mode Active
AUTOMATIC FLIGHT CONTROL SYSTEM
4-46 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
Vertical Takeoff Mode
On the ground, pushing either TOGA (Takeoff/Go-Around) button mounted on the
thrust levers selects the Takeoff mode and clears all other vertical modes. Lateral and
vertical takeoff mode (TO) selections are coincident. During takeoff mode, the flight
directors operate in dual independent mode. When takeoff mode is active, a green TO
annunciation appears in the vertical active field of the FMA and ALTS mode is
automatically armed to capture the preselected altitude.
The autopilot will disengage whenever a TOGA button is
pressed on the ground or in-flight. The autopilot visual and aural
disengage warnings may be canceled by pushing either TOGA
button again, or by pushing the AP/SP DISC switch.
The vertical component of Takeoff mode (TO) normally generates a 14-degree pitchup
command. Loss of engine during takeoff changes the pitch-up reference to 10
degrees.
Takeoff vertical mode is cleared by
• selecting or capturing another active mode
• engaging the autopilot, or
• pressing the FD SYNC button
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