the high speed profile. The IAS/Mach refer-
ence display and bug indicate the commanded
speed reference. The speed reference cannot
be changed with the SPD knob in this mode.
When FLC/FLCH is selected for climb to
higher altitude, the airspeed scale on the PFD
will automatically switch to Mach when the
profile (Figure 16-48) intercepts the Mach
schedule. Also, when FLC/FLCH is selected
for descent from a higher altitude the PFD air-
speed scale will indicate Mach until the descent
profile (Figure 16-49) switches to IAS.
VNV (Vertical Navigation)
Depressing the VNV button arms, then cap-
tures the FMS pitch steering commands of the
FDs if FMS is selected as the NAV source, the
FMS is programmed for a vertical navigation
profile, the altitude preselector is set below ex-
isting altitude and the airplane is within the
TOD (top of descent) window.
When the VNV mode is armed, a white VNAV
is annunciated on the PFDs in the FD vertical
mode annunciation field. The FMS automat-
ically initiates capture of the descent path if
VNV is engaged and the airplane has reached
the TOD point. When the vertical navigation
beam has been captured, the annunciation
turns green. Fifteen (15) seconds prior to ini-
tiating the descent (5 seconds if on FMS ap-
proach), the amber “VTA”(vertical track alert)
annunciator appears on the PFDs.
The vertical deviation scale appears when
VNV is programmed. Enroute vertical navi-
gation scaling is + 1,500 feet full scale, and
the terminal scaling is + 500 feet, and ap-
proach is + 200 feet.
ASEL (Altitude Select) Rotary Knob
The altitude preselect mode provides a means
for FD/AP to climb or descend to a prese-
lected altitude and then level off and maintain
the preselected altitude. The ASEL knob is
used to set the altitude preselect function, and
also provides the altitude reference for the al-
titude alerter function. The preselect altitude
is annunciated by a magenta digital display at
the top of the altitude tape on the PFD, and by
a magenta bug located on the left side of the
altitude tape that corresponds to the digital
readout. If the preselected altitude is above or
below the range shown on the tape (approxi-
mately 550 feet) the bug is parked at the
top/bottom of the tape and is partially blanked.
The altitude preselect mode arms automatically
when the altitude is set to an altitude that is
different from the existing altitude. The white
“ASEL” displays on the PFD to the left of the
altitude preselect display when armed (Figure
16-32). Selecting another vertical mode other
than altitude hold (ALT) will not disconnect
the altitude preselect arm mode. When altitude
select captures, the white ASEL is removed and
a green ASEL appears as the captured FD
mode. The FD automatically transitions to al-
titude hold (ALT) after the airplane has lev-
eled off at the selected altitude.
ALT (Altitude Hold)
Altitude hold may be engaged by depressing
the ALT button on the FGC. Also, altitude
hold (ALT) automatically engages after cap-
turing an altitude using ASEL. When within
20 feet of the pre-selected altitude, the green
ASEL FD annunciation will be replaced with
L E A R J E T 4 5
P I L O T T R A I N I N G M A N U A L
16-89
FOR TRAINING PURPOSES ONLY
FlightSafety
international
30,000 FT
(PRESSURE
ALT)
32,260 FT
(PRESSURE
ALT)
HIGH SPEED
CLIMB
PROFILE
NORMAL
CLIMB
PROFILE
12,000 FT
(BAROMETRIC
ALT)
10,000 FT
(BAROMETRIC
ALT)
275 KTS
250 KTS
.73 MACH
.70 MACH
DISPLAYED
ALTITUDE
IAS
Figure 16-48. Climb Profile (FLC/FLCH)
