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button.
Pitch mode is automatically cleared by selection or capture of another vertical mode.
NOTE
AUTOMATIC FLIGHT CONTROL SYSTEM
For Training Purposes Only
Sept 04
4-37
P I LOT T R A I N I N G GU I D E
Pitch Mode
Figure 4-28
P604_04_066
7000
10000 1.1
10
10
MDA
A A
A
HDG
LNV1
DR PTCH
ALTS
AP
2500M
M.454
280
240
220
250
260
4
4
2
2
1
1
29.92 IN
10
100
200
900
800
000
AUTOMATIC FLIGHT CONTROL SYSTEM
4-38 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
Altitude Preselect Mode
The Altitude Preselect mode (ALTS) causes the flight director to generate commands
to capture and level off at the preselected altitude. It is comprised of armed, capture
and track states. Altitude Preselect mode commands are based on the coupled side
barometric altimeter.
The preselected altitude is set by the ALT knob on the FCP, and is displayed as a
magenta digital readout on the top right corner of the PFDs, and by a magenta altitude
(double-bar) bug on the barometric altimeters.
The ALTS mode is automatically armed upon selection of any vertical mode, except
altitude hold (ALT), vertical approach (GS or VGP), or Go-Around (GA) modes.
When ALTS mode is armed, the FCCs calculate the capture point for the preselected
altitude while operating in the current active vertical mode. The capture point is a
function of closure rate, with the capture point occurring earlier for high closure rates.
A white ALTS annunciation appears in the vertical armed field of the FMA when
Altitude Preselect mode is armed.
When the airplane is in a position to capture the preselected altitude, the system
generates commands to level off (capture) and track the preselected altitude. During
the altitude capture sequence, a green ALTS CAP annunciation is displayed in the
vertical capture field of the FMA and the armed annunciation is removed.
When the capture (level-off) is completed, the flight director generates commands to
track the preselected altitude. A green ALTS annunciation remains displayed in the
vertical capture field of the FMA.
If the preselected altitude is changed during altitude capture, the
ALTS CAP display is replaced by ALT, and a yellow ALTS
annunciation is temporarily displayed in the vertical armed field
of the FMA. The FCCs will continue to capture and track the
original preselected altitude displayed while ALTS CAP was
active.
NOTE
AUTOMATIC FLIGHT CONTROL SYSTEM
For Training Purposes Only
Sept 04
4-39
P I LOT T R A I N I N G GU I D E
Altitude Capture Sequence
Figure 4-29
P604_04_065
7000
7000
7000
12000
12000
12000
1.0
1.0
10
10
10
20
20
20
10
10
10
MDA
MDA
MDA
A
A
A
A
A
A
A
A
A
HDG
HDG
HDG
LNV1
LNV1
LNV1
DR
DR
DR
FLC
ALTS CAP
ALTS
ALTS
ALTS
ALTS
AP
AP
AP
2500M
2500M
2500M
4
4
4
4
4
4
2
2
2
2
2
2
1
1
1
1
1
1
M.458
M.462
M.470
280
280
280
240
240
240
220
220
220
250
250
250
260
260
260
11
11
12
300
100
200
100
900
100
000
800
900
700
200
000
000
29.92 IN
29.92 IN
29.92 IN
800
AUTOMATIC FLIGHT CONTROL SYSTEM
4-40 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
Altitude Alert System
The Altitude Alert System provides aural and visual indications of preselected altitude
capture and tracking. It also provides aural and visual indications of altitude deviations
from the preselected altitude (ALTS).
The Altitude Alerting System processes data from the Air Data Computers (ADCs)
and is independent of the flight director or autopilot modes. Altitude alert
annunciations are based on the baro-corrected altitude of the coupled side altimeter.
Capture Alert
At 1000 feet prior to the preselected altitude, the preselected digital readout and bug
flash and an aural tone (C-chord) sounds.
Deviation Alert
If the aircraft deviates by more than 200 and/or 1000 feet from the preselected altitude,
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