Meggitt S-TEC Fifty Five X Owner's manual

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HDG NAV APR REV TRIM ALT GS VS
RDY CWS
FAIL
GPSS
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F FX IFTY IVE
Pilot’s Operating Handbook
System Fifty Five X Autopilot
Cirrus SR20/22Aircraft
SR20: SN 1337 and Above
SR22: SN 0435 and Above

1st Ed. Jul 15, 06 i
S–TEC
List of Effective Pages * Asterisk indicates pages changed, added, or deleted by
current revision.
PageNo. Issue
*3-33 Jul19,06
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. Jul 15, 06
1
st Rev. Jul 19, 06
1st Rev.Jul 19, 06

ii 1st Ed. Jul 15, 06
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1st Ed. Jul 15, 06 iii
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Table of Contents
Sec. Pg.
1 Overview...........................................................................................................1–1
1.1 DocumentOrganization....................................................................1–3
1.2 Purpose..............................................................................................1–3
1.3 GeneralControlTheory....................................................................1–3
1.4 ModesofOperation...........................................................................1–4
1.4.1 RollAxisControl.................................................................1–4
1.4.2 PitchAxisControl...............................................................1–4
1.5 BlockDiagram....................................................................................1–4
2 Pre-FlightProcedures...................................................................................2–1
2.1 Power-UpTest....................................................................................2–3
2.2 Pre-FlightTest....................................................................................2–7
3 In-FlightProcedures......................................................................................3–1
3.1 NormalOperatingProcedures........................................................3–3
3.1.1 Heading(HDG)Mode........................................................3–3
3.1.2 Navigation(NAV) Mode......................................................3–4
3.1.2.1 PilotSelectableInterceptAngle........................3–7
3.1.3 Global Positioning System Steering (GPSS) Mode.......3–8
3.1.3.1 PilotSelectableInterceptAngle........................3–9
3.1.4 AltitudeHold(ALT)Mode..................................................3–11
3.1.5 VerticalSpeed(VS)Mode.................................................3–12
3.1.5.1 NormalOperation..............................................3–12
3.1.5.2 PFDFailureOperation....................................3–12

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3.1.6 AltitudePre-SelectFunction.............................................3–14
3.1.7 Autotrim(SR22Only).......................................................3–16
3.1.8 ManualElectricTrim(SR22 Only)..................................3–16
3.2 PrecisionApproachProcedures.....................................................3–18
3.2.1 Straight-InILSApproach....................................................3–18
3.2.2 ILSApproach with ProcedureTurn................................3–22
3.3 Non-PrecisionApproachProcedures............................................3–22
3.3.1 Straight-In Back CourseApproach..................................3–22
3.3.2 Back CourseApproach with Procedure Turn...............3–24
3.3.3 Straight-In LOCApproach................................................3–26
3.3.4 Straight-InVORApproach.................................................3–27
3.3.5 LOCApproach with ProcedureTurn..............................3–28
3.3.6 VORApproach with ProcedureTurn..............................3–30
3.3.7 GPSSApproach..................................................................3–32
3.4 FlightDirector(FD) Operation.........................................................3–32
3.4.1 APMode...............................................................................3–32
3.4.2 FDMode...............................................................................3–33
3.5 AutopilotDisconnect........................................................................3–33
4 OperatingParameters..................................................................................4–1
4.1 RollAxisLimits..................................................................................4–3
4.2 PitchAxisLimits.................................................................................4–3
5 Glossary...........................................................................................................5–1

1st Ed. Jul 15, 06 v
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List of Figures
Fig. Pg.
1–1 SystemFiftyFive XBlockDiagram..............................................................1–5
2–1 APDisplay,Power-UpAnnunciations........................................................2–4
2–2 APDisplay,SoftwareRevisionNumber.....................................................2–4
2–3 PFDDisplay, INITIALAHRSALIGNMENT Message.................................2–4
2–4 APDisplay, RDYAnnunciation....................................................................2–5
2–5 PFD Display,APRDYAnnunciation............................................................2–5
2–6 APDisplay,FAILAnnunciation.....................................................................2–6
2–7 PFDDisplay,APFAILAnnunciation.............................................................2–6
2–8 APDisplay, HDG Mode Engaged(Pre-Flight)..........................................2–8
2–9 PFDDisplay, HDG Mode Engaged(Pre-Flight)........................................2–8
2–10 APDisplay, HDG andALT HOLD Modes Engaged (Pre-Flight)..............2–9
2–11 PFD Display, HDG andALT HOLD Modes Engaged (Pre-Flight)..........2–9
2–12 APDisplay, HDG and VSModesEngaged(Pre-Flight)..........................2–11
2–13 PFD Display, HDG and VS Modes Engaged (Pre-Flight).......................2–11
3–1 APDisplay,HDGMode Engaged................................................................3–3
3–2 PFDDisplay, HDGModeEngaged.............................................................3–3
3–3 APDisplay,NAVModeEngaged..................................................................3–4
3–4 PFD Display,NAV ModeEngaged,A/Con45°InterceptAngle...............3–4
3–5 PFD Display, NAV Mode Engaged,A/C Turning onto Course.................3–5
3–6 PFD Display,NAV Mode Engaged,A/CTrackingCourse.........................3–6
3–7 APDisplay,APRModeEngaged .................................................................3–7
3–8 APDisplay, HDG Mode Engaged,NAVModeArmed................................3–7

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3–9 PFDDisplay, HDG ModeEngaged,NAV ModeArmed..............................3–8
3–10 APDisplay, GPSSModeEngaged..............................................................3–8
3–11 PFDDisplay,GPSSMode Engaged...........................................................3–9
3–12 APDisplay,HDGMode Engaged, GPSSModeArmed...........................3–10
3–13 PFDDisplay, HDG ModeEngaged,GPSSModeArmed........................3–10
3–14 APDisplay, HDG andALTHOLDModesEngaged.................................3–11
3–15 PFDDisplay, HDGandALTHOLD Modes Engaged...............................3–11
3–16 APDisplay, HDG and VSModesEngaged..............................................3–13
3–17 PFDDisplay, HDG andVSModesEngaged...........................................3–12
3–18 APDisplay, HDG andVSModesEngaged,PFDFailure........................3–13
3–19 APDisplay, HDG and VS Modes Engaged,ALT HOLD ModeArmed....3–15
3–20 PFD Display, HDG and VS Modes Engaged,ALT HOLD ModeArmed....3–15
3–21 APDisplay, HDG andALTHOLD Modes Engaged.................................3–15
3–22 APDisplay,HDGandALTHOLDModesEngaged,AutotriminProgress.........3–16
3–23 APDisplay, NAV,APR, andALT HOLD Modes Engaged.......................3–19
3–24 PFDDisplay, NAV,APR, andALTHOLD Modes Engaged .....................3–19
3–25 APDisplay,NAV,APRandALTHOLDModesEngaged, GSModeArmed .......3–20
3–26 PFDDisplay,NAV,APRandALTHOLDModesEngaged, GSModeArmed......3–20
3–27 APDisplay, NAV,APR and GSModesEngaged......................................3–21
3–28 PFDDisplay,NAV,APR and GS ModesEngaged...................................3–21
3–29 Straight-InILSApproach...............................................................................3–21
3–30 APDisplay,APRModeEngaged,BackCourse......................................3–22
3–31 APDisplay,APRModeEngaged,BackCourse......................................3–23
3–32 Straight-In BackCourseApproach.............................................................3–23

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3–33 APDisplay,APRModeEngaged,TrackLOCBackCourseOutbound.............3–24
3–34 APDisplay,APRModeEngaged,TrackLOC BackCourseInbound................3–24
3–35 BackCourseApproach with ProcedureTurn..........................................3–25
3–36 APDisplay,APRModeEngaged,TrackLOC FrontCourseInbound..................3–26
3–37 Straight-InLOCApproach............................................................................3–26
3–38 APDisplay,APRModeEngaged,TrackVOR FrontCourseInbound.................3–27
3–39 Straight-InVORApproach............................................................................3–27
3–40 APDisplay,APRModeEngaged,TrackLOCFrontCourseOutbound.............3–28
3–41 APDisplay,APR ModeEngaged,TrackLOC FrontCourseInbound...............3–28
3–42 LOCApproach with ProcedureTurn........................................................3–29
3–43 APDisplay,REVModeEngaged,TrackVORFront CourseOutbound.............3–30
3–44 APDisplay,APRModeEngaged,TrackVOR FrontCourse Inbound...............3–30
3–45 VORApproachwithProcedureTurn........................................................3–31
3–46 PFDDisplay, HDGandALTHOLDAPModesEngaged.........................3–32
3–47 PFDDisplay,FDModeOnlyEngaged.....................................................3–33

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List of Tables
Table Pg.
2–1 Power-UpTest...............................................................................................2–3
2–2 Pre-FlightTest...............................................................................................2–7

1st Ed. Jul 15, 06 1-1
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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 System Fifty Five X Autopilot (AP), installed
in the Cirrus SR20/22 aircraft (A/C), and integrated with the Avidyne Primary
Flight Display (PFD), as well as the Garmin GNS 430 Navigation Receiver.
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) approvedAircraft 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 System Fifty Five X autopilot is a tool provided to Cirrus SR20/22 aircraft
owners, that serves to assist them with cockpit workload management. The
ability of the autopilot 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 autopilot, its modes, and operating procedures in
Visual Meteorological Conditions (VMC), prior to using it under Instrument
Flight Rules (IFR).
1.3 General Control Theory
The System Fifty Five X is a rate based autopilot. When in control of the roll axis,
the autopilot senses turn rate, as well as closure rate to the selected course,
along with the non-rate quantities of heading error, course error, and course
deviation indication. When in control of the pitch axis, the autopilot senses
vertical speed, acceleration, and closure rate to the selected glideslope, along
with the non-rate quantities of altitude and glideslope deviation indication. These
sensed data provide feedback to the autopilot, which processes them in order to
control the aircraft through the use of mechanisms coupled to the control
system. The roll trim cartridge is coupled to the ailerons. The pitch trim
cartridge and pitch servo (SR22 only) are coupled to the elevator. Activation of
roll axis control must always precede activation of pitch axis control.

1-4 1st Ed. Jul 15, 06
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1.4 Modes of Operation
1.4.1 Roll Axis Control
Heading (HDG) Mode
Used to Turn onto a Selected Heading and Hold it
Navigation (NAV) Mode
Used to Intercept and Track a VOR or GPS Course
Approach (APR) Mode
Used to Intercept and Track a LOC Front Course Inbound
Reverse (REV) Mode
Used to Intercept and Track a LOC Back Course Inbound
Global Positioning System Steering (GPSS) Mode
Used to Laterally Steer along a Course defined by GPS
1.4.2 Pitch Axis Control
Altitude Hold (ALT) Mode
Used to Hold Altitude
Vertical Speed (VS) Mode
Used to Hold Vertical Speed
Glideslope (GS) Mode
Used to Intercept and Track Glideslope
1.5 Block Diagram
The System Fifty Five X Block Diagram is shown in Fig. 1-1.

1st Ed. Jul 15, 06 1-5
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Fig. 1-1. System Fifty Five X Block Diagram

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1st Ed. Jul 15, 06 2-1
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SECTION 2
PRE-FLIGHT PROCEDURES

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1st Ed. Jul 15, 06 2-3
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2.1 Power-Up Test
Perform the actions shown in Table 2-1. For each action, verify the corresponding
response where applicable.
Table 2-1. Power-Up Test
ACTION RESPONSE
1. Set Battery Master Switch to ON
position. All annunciations appear on AP display as shown in Fig. 2-1, and then
extinguish.
Software revision number briefly
appears on AP display as shown in
Fig. 2-2, and then extinguishes.
INITIAL AHRS ALIGNMENT
message appears on PFD display, as
shown in Fig. 2-3.
RDY annunciation alone re-appears
on AP display within 3 minutes, as
shown in Fig. 2-4 (Notes 1, 2).
Once AHRS has completed its
alignment, AP RDY annunciation
appears on PFD display as shown in
Fig. 2-5.
Notes:
1. Should a failure be detected, the FAIL annunciation alone will re-appear on
the AP display as shown in Fig. 2-6, and the autopilot will not operate. In
addition, the AP FAIL annunciation will appear on the PFD, as shown in
Fig. 2-7.
2. Should the rate gyro internal to the Turn Coordinator fail to reach sufficient
speed, the AP display will remain blank indefinitely and the autopilot will
not operate. This typically indicates that the Turn Coordinator needs repair.

2-4 1st Ed. Jul 15, 06
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Fig. 2-1. AP Display, Power-UpAnnunciations
Fig. 2-2. AP Display, Software Revision Number
Fig. 2-3. PFD Display, INITIALAHRS ALIGNMENT Message

1st Ed. Jul 15, 06 2-5
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Fig. 2-4. AP Display, RDY Annunciation
Fig. 2-5. PFD Display,AP RDYAnnunciation