S-TEC
ilot’s
O
perating Handboo
k
5th Ed. Feb 15, 08 i
S–TEC
List of Effective Pages
* Asterisk indicates pages changed, added, or deleted by
current revision.
Record of Revisions
Retain this record in front of handbook. Upon receipt of a
revision, insert changes and complete table below.
Revision Number Revision Date Insertion Date/Initials
1st Ed. Mar 14, 00
2nd Ed. Dec 13, 00
3rd Ed. Jan 14, 02
4th Ed. Sep 05, 03
5th Ed. Feb 15, 08
ii 5th Ed. Feb 15, 08
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Table of Contents
Sec. Pg.
1 Overview ...........................................................................................................1–1
1.1 Document Organization....................................................................1–3
1.2 Purpose..............................................................................................1–3
1.3 General Control Theory ....................................................................1–3
1.4 Block Diagram....................................................................................1–4
2 Pre-Flight Procedures...................................................................................2–1
2.1 Pre-Flight T est....................................................................................2–3
3 In-Flight Procedures......................................................................................3–1
3.1 Normal Operating Procedures........................................................3–3
3.1.1 Heading (HDG) Mode........................................................3–3
3.1.2 Global Positioning System Steering (GPSS) Mode.......3–3
3.2 Approach Procedures.......................................................................3–4
3.2.1 Standard Approach.............................................................3–4
3.2.2 GPS Overlay of VOR / DME-A Approach...........................3–4
3.2.3 GPS-T Approach.................................................................3–4
3.2.4 GPS Approach with Holding Pattern................................3–4
3.2.5 GPS Overlay of VOR Approach with Procedure Turn.....3–4
3.3 Emergency Procedures....................................................................3–9
4 Operating Parameters..................................................................................4–1
4.1 Ranges.................................................................................................4–3
5 Glossary...........................................................................................................5–1
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List of Figures
Fig. Pg.
1–1 HDG / GPSS Selector Switch.......................................................................1–5
1–2 ST -901 GPSS Converter Block Diagram...................................................1–5
2–1 HDG / GPSS Selector Switch (Pre-Flight)..................................................2–4
3–1 GPS Overlay of VOR / DME-A Approach......................................................3–5
3–2 GPS-T Approach.............................................................................................3–6
3–3 GPS Approach with Holding Pattern...........................................................3–7
3–4 GPS Overlay of VOR Approach with Procedure Turn................................3–8
List of Tables
Table Pg.
2–1 Pre-Flight T est...............................................................................................2–3
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SECTION 1
OVERVIEW
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1.1 Document Organization
Section 1 Overview
Section 2 Pre-Flight Procedures
Section 3 In-Flight Procedures
Section 4 Operating Parameters
Section 5 Glossary
1.2 Purpose
This Pilot's Operating Handbook (POH) provides Pre-Flight and In-Flight operating
procedures for the S-TEC ST-901 Global Positioning System Steering (GPSS)
Converter.
Note:
This POH must be carried in the A/C and made available to the pilot at
all times. It can only be used in conjunction with the Federal Aviation
Administration (FAA) approved Aircraft Flight Manual (AFM) or Aircraft Flight
Manual Supplement (AFMS). Refer to the applicable AFM or AFMS for
A/C specific information, such as unique ground tests, limitations, and
emergency procedures.
Note:
The GPSS Converter is a tool provided to aircraft owners, that serves to
assist them with cockpit workload management. The ability of the
GPSS Converter to provide optimum assistance and performance is
directly proportional to the pilot's knowledge of its operating procedures.
Therefore, it is highly recommended that the pilot develop a thorough
understanding of the GPSS Converter and its operating procedures in Visual
Meteorological Conditions (VMC), prior to using it under Instrument Flight
Rules (IFR).
1.3 General Control Theory
The GPSS Converter can be used with the following S-TEC autopilots:
System T wenty / Thirty
System Forty / Fifty
System Fifty Five
System Sixty T wo
System Sixty Five
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It has the following modes of operation:
HDG Mode - Used to turn onto a Selected Heading and Hold it
GPSS Mode - Used to Laterally Steer along a Course defined by Waypoints,
that have been programmed into the GPS Navigator
Pressing the HDG / GPSS Selector Switch will alternately engage the HDG
mode and GPSS mode. This switch is shown in Fig. 1-1. As indicated, when the
HDG mode is engaged, the HDG lamp is illuminated and the GPSS lamp is
extinguished, but when the GPSS mode is engaged, the GPSS lamp is illuminated
and the HDG lamp is extinguished.
The GPSS Converter is internally configured to be compatible with the particular
AC or DC Heading System installed in the aircraft, be it a Directional Gyro (DG)
or Horizontal Situation Indicator (HSI). The output of the Heading System will be
either an AC or DC Heading Error Signal. When the GPSS Converter's HDG
mode is engaged, the GPSS Converter processes the AC or DC Heading Error
Signal at its input, to produce a proportional DC Heading Error Signal at its
output. This signal is sent to the input of the autopilot's heading error channel.
When the autopilot's HDG mode is also engaged, the autopilot will turn the
aircraft onto the selected heading and hold it.
The GPS Navigator is programmed with a sequence of waypoints, as a means
to define a course. This course is realized at the output of the GPS Navigator in
the form of two digital signals, the Bank Angle Signal and Ground Speed Signal.
When the GPSS Converter's GPSS mode is engaged, the GPSS Converter
processes the Bank Angle Signal and Ground Speed Signal at its input, to
produce a DC Turn Rate Signal at its output. This signal is sent to the input of
the autopilot's heading error channel. When the autopilot's HDG mode is also
engaged, the autopilot will laterally steer the aircraft along the course defined
by the waypoints.
1.4 Block Diagram
The GPSS Converter Block Diagram is shown in Fig. 1-2.
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Fig. 1-2. ST -901 GPSS Converter Block Diagram
Fig. 1-1. HDG / GPSS Selector Switch
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