Saab 340B, Руководство по эксплуатации

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AUTOFLIGHT, CAT I
Description
Aircraft Operations Manual
3.1
S
PAGE 3
Jun 01/19
if the pitch knob is moved out of its detent ex-
cept in GS ”CAP” or ALTS mode.
− Selection of/Reversion to VS clears any pre-
viously selected vertical mode except GS ”CAP”
and ALTS.
IAS, Indicated Airspeed mode
− The FCC gives pitch attitude commands to main-
tain the IAS existing at time of mode engagement
or
− if already in IAS − at time of pressing and
releasing the VERT SYNC button.
− Mode selectable by pushing the IAS mode button
on the MSP. Selection of IAS clears any pre-
viously selected vertical mode except ALTS and
GS ”CAP”.
CLIMB mode
− The FCC computes and updates a climb IAS dis-
played on the EADI. The computed IAS is a func-
tion of altitude at medium aircraft weight.
− There are three climb mode settings (Rate of
Climb, R
− o − C) to be used for the computation of
IAS. They are selectable by cycling the CLIMB
mode push button on MSP. The desired climb
setting annunciated on EFIS, ”H”, ”M” and ”L”
respectively, is related to their effect on IAS
(High, Medium and Low IAS).
− One push gives a rather low, R − o − C (H), two
pushes a medium R − o − C (M) and three pushes
give the best R − o − C (L). This is the sequence
when climb mode is selected the first time after
power up. The last selected climb setting will
reappear when climb mode is reselected after a
vertical mode change.
− Selection of CLIMB mode clears any previously
selected vertical mode except GS ”CAP” and
ALTS.
ALT
− FCC holds the altitude existing at time of mode
engagement or
− if already in ALT − at time of
pressing and releasing the VERT SYNC button.
A Flight advisory IAS for Long Range Cruise will
be displayed on the EADI when ALT mode is in
track.
− The computed IAS is a function of altitude at me-
dium aircraft weight.
− Selectable by ALT mode button.
− Selection of ALT clears any previously selected
vertical mode except ALTS and GS ”CAP”.
− The altitude is held regardless of barometer set-
tings.
ALTS
− When approaching the altitude selected on the
APA the FCC will command an asymptotic cap-
ture profile and holding of the selected altitude.
− The capture point is variable and is a function of
aircraft vertical speed.
− The ALTS submode is always armed for capture
of the altitude selected on the APA. Once en-
gaged, the ALTS clears any other vertical mode
except GS ”CAP”. Furthermore, it is not possible
to select any other vertical mode except GA until
a new altitude is selected on the APA; GS ”CAP”
will automatically cancel ALTS. A Flight advisory
IAS for Long Range cruise will be displayed on
the EADI when ALTS mode is in track. The com-
puted IAS is a function of altitude at medium air-
craft weight.
− For visual and aural altitude alert signals, see
AOM 12/1.1, AIR DATA SYSTEM.
− The altitude selected on the APA will follow the
barometer settings made on the left altimeter.
VNAV, Vertical Navigation Mode (If installed)
− The VNAV mode works in conjunction with the
VNI (Vertical Navigation Indicator) if installed.
− Selectable if a VNAV path has been defined on
the VNI and it is less than three minutes to the
determined descend/climb point.
− Mode is armed by pushing the VNAV button on
the MSP and the letters VNAV will be indicated
on the EADI.
− The FCC will continue in the existing vertical
mode until capture conditions have been met,
then automatically capture and track a VNAV
path as defined on the VNI.
− At capture VNAV clears any previously selected
vertical mode except ALTS.
− Vertical command data provided by the VNI are
displayed on the EHSI by the vertical deviation