Stec ST360 Manual del propietario
Altitude Selector/Alerter
P/N 01279
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Pilot’s Operating
Handbook
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REVISIONS
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insert revised pages in the manual and enter date inserted and initials.
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1st Ed 26 Oct 00
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NOTES
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TABLE OF CONTENTS
REVISIONS 2
NOTES 3
TABLE OF CONTENTS 4
INTRODUCTION 5
ALTITUDE SELECTOR/ALERTER BLOCK DIAGRAM 6
ALTITUDE SELECTOR/ALERTER 7
Theory of Operation 7
Quick Reference 8
Important Points to Remember 8
Features and Functions 9
Self Test 9
Data (DTA) Entry - Operate 9
Baro Calibration 10
Vertical Speed (VS) Selector 11
Altitude (ALT) Select Function 14
Altitude Alert (ALR) Mode 14
Decision Height (DH) Alert Mode 15
Operation 16
Preflight 17
Inflight 19
Emergency Procedures 20
Lost Encoder Data 21
SYSTEM SPECIFICATIONS 22
LIST OF ACRONYMS 23
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INTRODUCTION
The Altitude/Vertical Speed Selector/Alerter, hereafter referred to as
Altitude Selector/Alerter, allows the pilot to preselect altitude and verti-
cal speed. In addition to these basic functions, the selector provides an
Altitude (ALT) Alert Mode, a Decision Height (DH) Alert Mode, an Al-
titude Read-Out from the Encoder, barometric calibration in inches of
mercury or millibars, and other features. This handbook provides infor-
mation on the features and functions of the Altitude Selector/Alerter and
operating instructions for its proper use.
The Altitude Selector/Alerter combines the computer and program-
mer units into a single panel mounted unit, which contains the display,
the operating switches and the computer electronics. The system was
designed to interface the S-TEC Autopilot with an altitude encoder/tran-
sponder providing a standard 100 ft increment altitude output.
Operation of the Altitude Selector/Alerter with the S-TEC Autopilot
is easy and straightforward. However, in order to achieve maximum ben-
efit and to utilize all of the systems features, it is important to have a clear
understanding of the system and its operating characteristics, features and
functions. Please read this manual carefully before using the Altitude
Selector/Alerter.
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ALTITUDE SELECTOR/ALERTER
Theory of Operation
The Altitude Selector/Alerter (ASA) enables the pilot to preselect al-
titudes and rates of climb or descent to be used by the autopilot. The
ASA reads and decodes the altitude information from the altitude en-
coder. This decoded information is adjusted by the setting of the baro-
metric (baro) calibration and then compared to a selected altitude setting.
When the information from the selected altitude matches the decoded
altitude information from the encoder, the altitude selector computer sig-
nals the autopilot to electrically engage the altitude hold mode of the
autopilot.
The Vertical Speed (VS) Selector provides an electrical output to the
autopilot pitch flight guidance computer that is proportional to the ampli-
tude and polarity (direction) of the vertical speed. For example, a + 500
feet per minute (FPM) climb VS, would produce a plus (+) voltage in an
amount representing 500 FPM. This signal is not utilized by the autopi-
lot until the VS Mode is engaged. At that time, the autopilot compares
the existing vertical speed with the selected vertical speed and maneuvers
the airplane to match these signals. The vertical speed selector portion of
the ASA can be disabled by pushing the “MAN” (Manual) switch which
will cause the autopilot to revert to its normal vertical speed command
system.
The Vertical Speed Selector portion of the ASA will function any
time the selector is showing a Vertical Speed and the Vertical Speed Mode
of the autopilot is selected. However, the Altitude Selector will function
only when the transponder and encoder are operating and when both the
VS and ALT Modes of the autopilot are selected.
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Data Entry - Liquid Crystal
Operate Switch Display Panel
Barometric Input Selector
Calibration Knob -Turn CW
(BARO) Mode to Increase, Pull
Switch for Decimals
Vertical Speed Selector and
Manual Mode Switches
Altitude Read Out/Altitude Selector, Alert (ALR)
and Decision Height (DH) Alert Mode Switches
ALTITUDE SELECTOR/ALERTER
Quick Reference
Important Points to Remember
1. Set Barometric calibration, Altitude and Vertical Speed following
initial self-test. System will be in data entry mode following self-test.
2. Push "DTA" to enter or change any data EXCEPT vertical speed -
VS. Once entered, push DTA to close the entry mode or the unit
cannot communicate your input/settings to the autopilot.
3. To activate pre-selected altitude and vertical speed, push both ALT
and VS buttons on the autopilot at the same time. This is confirmed
by the annunciation of both ALT and VS Modes on the autopilot.
4. For best accuracy relative to the target altitude, see "adjustment:
baro calibration" on page 10-11.
5. If you are unsure of the correct operation, turn off the Altitude
Selector/Alerter or push the MAN (Manual) button and revert to nor-
mal autopilot operation.
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Features and Functions
Self Test
When power is applied, the Altitude Selector Alerter will conduct an
internal self test of the computer electronic elements, the display and an-
nunciations and the altitude alerter audio tone (a two tone "ding dong").
Successful test conclusion is indicated by the display of the barometric
setting of 29.9 after completion of the test cycle.
Data (DTA) Entry - Operate
The DTA (Data) Switch button is used to select between data entry
and operate modes. When the DTA button is selected, the display will
show “ENT” to indicate entry mode and the SEL annunciator will flash
to indicate that an entry will change the altitude selected. To change
Baro, Decision Height or Vertical Speed, simply push the desired switch
button and rotate the selector knob clockwise (CW) to increase the num-
ber and counter clockwise (CCW) to decrease the number. Pull the selec-
tor knob out (detent) to change decimal numbers.
When the system is in entry mode it is decoupled from the autopilot,
however, the autopilot will hold the last vertical speed commanded.
Afterthe required values areselected, push DTA to remove the “ENT”
annunciation and return the system to operate mode. The entry will not
be accepted unless the data field is closed by the second push of the data
key.
NOTE: In entry mode, only the altitude select mode annunciator
will be active when “ALT” is selected - the actual altitude can not
be called up to the display.
NOTE: It is not necessary to select DTA Mode to enter vertical
speed changes. Vertical speed inputs can be made directly in op-
erate mode by simply rotating the selector knob.
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Baro Calibration
Encoding altimeters provide altitude information referenced to a stan-
dard pressure of 29.92 inches of mercury. Conversion of this information
is accomplished by computers in the Air Traffic Control Centers by ap-
plying the local altimeter setting, corrected to sea level. The baro calibra-
tion mode enables the pilot to provide a current altimeter setting by con-
verting the altitude encoder output to Mean Sea Level.
When the system is initially powered up, the baro mode will be dis-
played immediately after the test cycle. At other times, it will be neces-
sary to select the DTA (Data) button for Data Entry (ENT will be dis-
played) and then select “baro” which will display the last baro setting.
Repeated pushes of the baro button will cause the displayed baro units to
alternate between displaying the setting in inches of mercury (in Hg) or
millibars. When baro is displayed in millibars, the first two digits are
omitted: 1013.2 would display as 13.2 and 1036.9 would show as 36.9.
For any questions on the setting in millibars, a quick reference to in. Hg.
can be made by simply pushing the “baro” button once again.
NOTE: To ensure optimum accuracy of the Altitude/Selector
Alerter, the barometric setting should be updated along with the
other barometric flight instruments in the aircraft, as required.
Adjustment: Baro Calibration
If the altitude encoder is in proper adjustment, simply rotate the input
selector knob to display the desired baro calibration, matching the cur-
rent altimeter setting as shown in the Kollsman window of the altimeter
to the nearest 1/10th of an inch of mercury or millibar. Rotate the selec-
tor knob clockwise (CW) to increase the setting (regardless of whether
the selector knob is pushed in or pulled out).
In normal use, it is not uncommon for encoders and/or altimeters to
vary in calibration. When this occurs, the altitude selector will engage the
altitude hold mode (ALT) on the autopilot at an altitude that is higher or
lower than that selected. These calibration variations can be compensated
for as follows:
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