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Garmin GPS 175 Maintenance Manual Download Page 15

190-02207-A2

GPS 175/GNX 375/GNC 355 Part 23 AML STC Maintenance Manual

Rev. 3

Page 1-3

1.3 Applicability

This document applies to all aircraft with either the GPS 175, GNX 375, or the GNC 355 installed in 

accordance with STC SA02636SE. Modification of an aircraft by this STC obligates the aircraft operator 

to include the maintenance information provided by this document in the operator’s Aircraft Maintenance 

Manual and the operator's Aircraft Scheduled Maintenance Program.

1.4 Publications

In addition to this manual, the following documents are recommended to perform maintenance based on 

the installed and interfaced equipment. It is the responsibility of the owner/operator to ensure the latest 

applicable versions of these documents are used during operation, servicing, or maintenance of the 

airplane.

Table 1-1  Reference Documentation

1.5 Revision and Distribution

This document is required for maintaining the continued airworthiness of the aircraft. Garmin Dealers may 

obtain the latest revision of this document at the Garmin 

Dealer Resource Center

.

Dealers are notified of manual revision changes via a Garmin Service Bulletin.
Owner and operators may obtain the latest revision of this document at 

flyGarmin.com

 or by contacting a 

Garmin dealer. Garmin contact information is available at flyGarmin.com.

Part Number

Document

190-02207-A1

GPS 175 Part 23 AML STC Installation Manual

005-01206-A2

GPS 175/GNX 375/GNC 355 Part 23 AML STC Equipment List

005-01206-A1

GPS 175/GNX 375/GNC 355 Part 23 AML STC Master Drawing List

190-02207-A3

Airplane Flight Manual Supplement or Supplemental Airplane Flight Manual for 

Garmin GPS 175/GNX 375/GNC 355 GPS/XPDR/COM Navigation System

190-02207-A4

GNX 375 Part 23 AML STC Installation Manual

190-02207-A5

GNC 355 Part 23 AML STC Installation Manual

Summary of Contents for GPS 175

Page 1: ...C Maintenance Manual with Instructions for Continued Airworthiness for STC SA02636SE Aircraft make model registration number and serial number along with the applicable STC configuration information m...

Page 2: ...l distribution of this manual or any revision hereto is strictly prohibited Garmin is a registered trademark of Garmin International or its subsidiaries GDU is a trademark of Garmin International or i...

Page 3: ...ollowing license The free distribution and use of this software in both source and binary form is allowed with or without changes provided Distributions of this source code include the above copyright...

Page 4: ...uring the term of this Agreement provided that the Licensed Software may only be used by Licensee on Devices on which the Licensed Software has been installed or otherwise made available by Garmin b R...

Page 5: ...NOR ITS AFFILIATES MAKE ANY REPRESENTATION WARRANTY OR GUARANTEE STATUTORY OR OTHERWISE UNDER LAW OR FROM THE COURSE OF DEALING OR USAGE OF TRADE EXPRESS OR IMPLIED INCLUDING ANY WARRANTIES OF MERCHA...

Page 6: ...l become and remain binding upon a Party only if such amendment or waiver is set forth in a writing by such Party No course of dealing between or among any persons having any interest in this Agreemen...

Page 7: ...X 375 and GPS 175 GNC 355 3 4 3 1 2 Corrected descriptions of serial ports 3 4 3 1 3 Added Section 3 4 3 1 3 ADS B Source GPS 175 and GNC 355 Only 3 4 3 1 5 Added Section 3 4 3 1 5 GI 275 3 4 3 1 6 Ad...

Page 8: ...o avoid damage to the units take precautions to prevent Electrostatic Discharge ESD when handling the unit connectors and associated wiring ESD damage can be prevented by touching an object of the sam...

Page 9: ...5 4 5 Electrical Bonding Test 4 6 4 6 Overhaul Period 4 7 4 7 Additional Instructions 4 7 5 TROUBLESHOOTING 5 1 5 1 General Troubleshooting 5 2 5 2 Failure Annunciations 5 6 5 3 GPS 175 Connector Pino...

Page 10: ...02207 A2 GPS 175 GNX 375 GNC 355 Part 23 AML STC Maintenance Manual Rev 3 Page ix 9 RETURN TO SERVICE PROCEDURE 9 1 9 1 Maintenance Records 9 1 APPENDIX A AIRCRAFT INSTALLATION SPECIFIC INFORMATION A...

Page 11: ...75 GNC 355 Traffic Alert Troubleshooting 5 10 Figure 5 5 GNX 375 Traffic Alert Troubleshooting 5 11 Figure 5 6 XPDR Alert Troubleshooting 5 12 Figure 5 7 GNC 355 COM Alert Troubleshooting 5 17 Figure...

Page 12: ...le 5 1 GPS 175 General Troubleshooting Guide 5 2 Table 5 2 GNX 375 General Troubleshooting Guide 5 3 Table 5 3 GNC 355 General Troubleshooting Guide 5 4 Table 5 4 J1751 Connector Pinout 5 24 Table 5 5...

Page 13: ...ML STC Maintenance Manual Rev 3 Page 1 1 1 INTRODUCTION 1 1 Content Scope and Purpose 1 2 1 2 Organization 1 2 1 3 Applicability 1 3 1 4 Publications 1 3 1 5 Revision and Distribution 1 3 1 6 Referenc...

Page 14: ...tion 3 Control and Operation Provides basic control and operation information specifically tailored to maintenance practices Section 4 Instructions for Continued Airworthiness Provides Instructions fo...

Page 15: ...irplane Table 1 1 Reference Documentation 1 5 Revision and Distribution This document is required for maintaining the continued airworthiness of the aircraft Garmin Dealers may obtain the latest revis...

Page 16: ...AML Approved Model List LPV Localizer Performance with Vertical Guidance Approach ARINC Aeronautical Radio Incorporated LRU Line Replaceable Unit ATC Air Traffic Control OAT Outside Air Temperature B...

Page 17: ...5 GNX 375 GNC 355 Part 23 AML STC Maintenance Manual Rev 3 Page 2 1 2 SYSTEM DESCRIPTION 2 1 Equipment Descriptions 2 2 2 1 1 GPS 175 2 2 2 1 2 GNX 375 2 3 2 1 3 GNC 355 2 4 2 1 4 Flight Stream 510 2...

Page 18: ...flight plan I O and GPS position interface with a PED Database Concierge only available through Flight Stream 510 The GPS 175 is capable of providing TSO C146e compliant GPS WAAS navigation for en ro...

Page 19: ...on certified PED The built in Bluetooth will allow flight plan I O GPS position and ADS B Weather Traffic interface with a PED but will not allow software or database loading The GPS navigation functi...

Page 20: ...display of attitude on a non certified PED The built in Bluetooth will allow flight plan I O GPS position and ADS B Weather Traffic interface with a PED but will not allow software or database loadin...

Page 21: ...375 GNC 355 by replacing the front loaded data card to allow wireless database transfer with PEDs over WiFi Figure 2 4 Flight Stream 510 2 1 5 GAE 12 The GNX 375 allows for the use of an optional GAE...

Page 22: ...3 4 5 Feature Enablement 3 10 3 4 6 SD Save 3 10 3 4 7 SD Load 3 11 Control and operation of the GPS 175 GNX 375 and GNC 355 occurs through the use of the touch display dual rotary knob and the Home...

Page 23: ...ay be configured to be used by the display to automatically adjust the display backlighting with no further prompt Data Card Slot A card slot in the unit that accepts standard SD cards loader cards an...

Page 24: ...to the pilot Photocell The photocell may be configured to be used by the display to automatically adjust the display backlighting with no further prompt Data Card Slot A card slot in the unit that ac...

Page 25: ...ions to the pilot Photocell The photocell may be configured to be used by the display to automatically adjust the display backlighting with no further prompt Data Card Slot A card slot in the unit tha...

Page 26: ...190 02207 A4 For detailed information on configuring the GNC 355 refer to GNC 355 Part 23 AML STC Installation Manual While in Configuration mode different pages can be selected by touching the desir...

Page 27: ...nputs and outputs 3 4 3 1 2 RS 232 RS 422 The Interfaced Equipment RS 232 RS 422 page allows the configuration of data formats for serial ports Port 1 is capable of operating as an RS 232 port or an R...

Page 28: ...B Logging GNX 375 Only External FPL Altitude Source Input GPS 175 and GNC 355 Only 3 4 3 4 Main Indicator Analog The Main Indicator Analog page allows the user to calibrate the OBS resolver and confi...

Page 29: ...port is chosen for display by touching the ARINC 429 Port button to toggle between the input ports Select a port to display The GPS 175 GNX 375 GNC 355 will then display the label SSM Data and SDI for...

Page 30: ...t alerts The XPDR page allows the user to view the status of all failure conditions active faults active warnings and associated pilot alerts For troubleshooting of these errors refer to the XPDR Aler...

Page 31: ...and troubleshooting 3 4 4 16 XPDR Main Data GNX 375 Only The XPDR Main Data page provides the user access to the GPS Data Diagnostics and Air Data Diagnostics pages 3 4 4 17 Clear Config Settings To...

Page 32: ...ion must match the unit saved to the card Before configuring determine if a previously saved configuration is available Use the following instructions to load the saved configuration information to a...

Page 33: ...icing Information 4 3 4 2 1 Periodic Maintenance 4 3 4 2 2 Special Tools 4 3 4 3 Maintenance Intervals 4 4 4 4 Visual Inspection 4 5 4 5 Electrical Bonding Test 4 6 4 5 1 GPS 175 GNX 375 GNC 355 Bondi...

Page 34: ......

Page 35: ...test is executed automatically upon application of power to the units The built in tests BIT are continuously executed Detected errors are indicated as failure annunciations system messages or a comb...

Page 36: ...Us On Condition Cleaning The GPS 175 GNX 375 and GNC 355 display and bezel may be cleaned periodically The front bezel and display should be cleaned with a soft cotton cloth dampened with clean water...

Page 37: ...s properly oriented label facing left fully inserted and locked into position in the card slot on the front right side of the unit 2 Inspect for corrosion 3 Inspect switches knobs and buttons for dama...

Page 38: ...ortion of aircraft metallic structure and ensure that the resistance is less than or equal to 2 5 m 4 Re install the backplate assembly and re install the GPS 175 GNX 375 GNC 355 in the mounting rack...

Page 39: ...does not require overhaul at a specific time period Power on self test and BIT will monitor the health of the GPS 175 GNX 375 GNC 355 system If any LRU indicates an internal failure the unit may be r...

Page 40: ...5 2 5 2 Failure Annunciations 5 6 5 3 GPS 175 Connector Pinout Information 5 23 5 3 1 J1751 62 Pin HD DSub 5 23 5 4 GNX 375 Connector Pinout Information 5 25 5 4 1 J3751 62 Pin HD DSub 5 25 5 4 2 J37...

Page 41: ...ics are turned on Noise interference from other avionics Turn off all other avionics then turn on each piece of avionics one at a time to locate the source of the interference Route the GPS cable and...

Page 42: ...ing OBS indication on GNX 375 does not agree with OBS setting OBS resolver input not calibrated or calibrated incorrectly Check wiring and calibration GNX 375 is not receiving heading from compass sys...

Page 43: ...uting Check GPS antenna installation connections and cable routing The GPS antenna must be mounted on the top of the aircraft Antenna shaded from satellites Make sure the aircraft is clear of obstruct...

Page 44: ...ed on the Discrete Inputs page found on the GNC Diagnostics page No transmit power to COM Make sure power input is connected to the COM 44 pin connector P3552 30 43 and 44 and ground to P3552 37 38 an...

Page 45: ...Part 23 AML STC Maintenance Manual Rev 3 Page 5 6 5 2 Failure Annunciations If data fields become invalid the GPS 175 GNX 375 GNC 355 typically annunciates the failures with a large red X as shown in...

Page 46: ...ors in the regristries of pilot stored data Reset config and reconfigure unit Cooling fan failure OR Cooling fan obstruction The inner knob push key is stuck in the enabled or pressed state Corrective...

Page 47: ...n the enabled or pressed state Corrective Action Go to the Diagnostics Discrete Inputs page in Configuration Mode See Section 3 4 4 3 Press the key to cycle its operation If the state remains Active i...

Page 48: ...n internal fault and transponder functionality may be unavailable The transponder is reporting an internal temperature above its upper operating limits The transponder is reporting an internal tempera...

Page 49: ...al ADS B Out fault Check transponder is in correct mode Check that the transponder is in correct mode Corrective Action Cause Maintenance Log Message Communications with the GDL 88 GTX 345 has been lo...

Page 50: ...ear view of the sky If faults still exist contact Garmin Corrective Action Corrective Action Inspect compatibility of transponder antenna and connections Traffic FIS B functions inoperative Cause ADS...

Page 51: ...ftware Reset config and reconfigure unit Verify transponder antenna connections and coax installation Inspect wiring and connections Transponder Or 1090 ADS B Out Failure Cause Corrective Action High...

Page 52: ...ction Transponder FPGA ROM Failure FPGA software load issue Reload software Transponder Or 1090 ADS B Out Failure Cause Corrective Action Transponder ROM Failure Software load issue Reload software Tr...

Page 53: ...load or is invalid Service Soon Fault Cause Corrective Action ADS B In Electrical Fault ADS B In Calibration Fault Reload software Electrical fault with the ADS B board Possible internal hardware prob...

Page 54: ...ction Corrective Action Audio ROM Fault Non volatile Memory Fault Audio database did not load or is invalid Non volatile data did not load or is invalid Service Soon Service Soon Fault Fault Cause Cau...

Page 55: ...erify pressure sensor is functioning If using the GAE verify connections and then recalibrate Reload software System in ground test mode Power cycle the unit Warning Cause Corrective Action Alert Caus...

Page 56: ...eased If faults still exist contact Garmin Corrective Action Corrective Action The COM remote transfer switch has been pressed for at least 2 seconds Corrective Action In Lockout mode the COM will tun...

Page 57: ...ns are correct Cause A stored flight plan contains an airway that is no longer consistent with the current navigation database Corrective Action Touch the Show flight plan catalog actionable button an...

Page 58: ...neous position Use other navigation source Cause Internal detection of erroneous GPS position data has occured Corrective Action Verify that the center conductor is not shorted to the braid in the coa...

Page 59: ...ve Action If faults still exist contact Garmin Approach not active Approach guidance not available Cause The unit did not have the required HPL VPL to get into at least LNAV Corrective Action Low inte...

Page 60: ...use the unit was unable to decode one or more waypoints The requested flight plan could not be imported because the user waypoint database is full Recheck file format and reload file if necessary Corr...

Page 61: ...any source The WAAS diagnostic log failed to export to the SD card The ADS B log failed to export to the SD card A stored flight plan waypoint is no longer in the current navigation database Follow ac...

Page 62: ...rete Input 2 Lighting Bus APPR 1 Power Input 1 Power Ground A T A RS 232 3 CDI RS 232 2 Discrete Out 4 I O I I 62 I B A Config Module 22 43 1 C C I T F O D D T R V OBS RS 232 1 B Demo Mode 3 TO FROM F...

Page 63: ...RNET IN P IN 42 POWER INPUT 1 IN 12 VERTICAL UP OUT OUT 43 CONFIG MODULE V OUT 13 GND 44 OBS STATOR D 14 GND 45 OBS STATOR E GND 15 LATERAL LEFT OUT OUT 46 GND 16 TO FLAG 47 GND 17 LOI DISCRETE OUT 2...

Page 64: ...I B2 A2 I R B D4 C2 O L 21 42 Ext Ident Input Air Ground Input Ext Standby Input Lighting Bus Ext Suppression Bus Switched Power Out Altitude Gray Code Input Power Input 1 Power Ground T A Ground RS 2...

Page 65: ...C1 IN 43 PRESSURE SENSOR CONFIG MODULE V OUT 13 ALTITUDE GRAY CODE INPUT D4 IN 44 RESERVED 14 EXT STANDBY DISCRETE IN 6 IN 45 RESERVED 15 DISCRETE I O 1 I O 46 AUDIO OUT OUT 16 DISCRETE I O 2 47 AUDIO...

Page 66: ...ESERVED 11 OBS ROTOR H GND OUT 33 DISCRETE OUT 4 OUT 12 OBS ROTOR C OUT 34 GND 13 APPROACH ANNUNCIATE OUT 35 GND 14 DISCRETE IN 2 IN 36 LATERAL GND 15 REMOTE GO AROUND 37 LATERAL FLAG OUT OUT 16 RESER...

Page 67: ...COMPOSITE LIGHTING BUS APPR 1 VDI AIRCRAFT POWER AIRCRAFT GROUND T A GROUND RS 232 3 CDI OBS RS 232 2 I O I I 62 I B A CONFIG MODULE 22 43 1 C C I T F O D D T R V RS 232 1 B TO FROM FLAG R 1PPS I O AR...

Page 68: ...IN 1A IN 42 AIRCRAFT POWER IN 12 VERTICAL UP OUT OUT 43 CONFIG MODULE POWER OUT 13 GND 44 OBS STATOR D IN 14 GND 45 OBS STATOR E GND 15 LATERAL LEFT OUT OUT 46 GND 16 TO OUT OUT 47 GND 17 LOI ANNUNCIA...

Page 69: ...9 RESERVED 31 GND 10 RESERVED 32 RESERVED 11 COM MIC KEY IN 33 RESERVED 12 RESERVED 34 RESERVED 13 RESERVED 35 RESERVED 14 RESERVED 36 RESERVED 15 RESERVED 37 AIRCRAFT GND 16 RESERVED 38 AIRCRAFT GND...

Page 70: ...trap 6 11 6 8 1 Bonding Strap Removal 6 11 6 8 2 Bonding Strap Replacement 6 11 Whenever an LRU is replaced it is important to verify that the software versions are compatible To verify replacement LR...

Page 71: ...on mechanism prior to placing the unit in the rack To ensure connectors mate properly center the unit in the rack CAUTION Be sure not to overtighten the unit into the rack The application of hex drive...

Page 72: ...190 02207 A2 GPS 175 GNX 375 GNC 355 Part 23 AML STC Maintenance Manual Rev 3 Page 6 3 Figure 6 1 GPS 175 Rack Installation...

Page 73: ...correct position prior to placing the unit in the rack CAUTION Be sure not to overtighten the unit into the rack The application of hex drive tool torque exceeding 15 in lbf can damage the locking me...

Page 74: ...190 02207 A2 GPS 175 GNX 375 GNC 355 Part 23 AML STC Maintenance Manual Rev 3 Page 6 5 Figure 6 2 GNX 375 Rack Installation...

Page 75: ...re correct position prior to placing the unit in the rack CAUTION Be sure not to overtighten the unit into the rack The application of hex drive tool torque exceeding 15 in lbf can damage the locking...

Page 76: ...190 02207 A2 GPS 175 GNX 375 GNC 355 Part 23 AML STC Maintenance Manual Rev 3 Page 6 7 Figure 6 3 GNC 355 Rack Installation...

Page 77: ...w VCDI Half Up VFLG Out of View TO FROM N A OBS The GNX displays the OBS value 149 5 if interfaced to an HSI with driven course pointer DTK 149 5 Displayed as 150 Items below do not display on the Ins...

Page 78: ...dance with Sections 6 1 1 6 2 1 or 6 3 1 2 Remove the backshell cover 6 by removing the two screws 7 3 Lift the configuration module 1 out of the backshell 5 and disconnect the wiring harness 2 from t...

Page 79: ...PS 175 GNX 375 GNC 355 in accordance with Section 6 1 1 6 2 1 or 6 3 1 2 Disconnect the four conductor wire harness and the static pressure source tubing from the GAE 3 Remove the two countersunk scre...

Page 80: ...ection 4 2 of GPS 175 Part 23 AML STC Installation Manual P N 190 02207 A1 GNX 375 Part 23 AML STC Installation Manual P N 190 02207 A4 or GNC 355 Part 23 AML STC Installation Manual P N 190 02207 A5...

Page 81: ...PS 175 GNX 375 GNC 355 Part 23 AML STC Maintenance Manual Rev 3 Page 7 1 7 SOFTWARE 7 1 Software Check 7 2 7 2 Software Updates 7 2 7 2 1 Software Loader Card Instructions 7 2 7 2 2 Software Update In...

Page 82: ...an SD card reader to the PC 4 Insert the SD card into the card reader 5 Run the exe file downloaded from the Dealer Resource Center 6 Follow the screen prompts to create the loader card 7 Click the F...

Page 83: ...Part 23 AML STC Maintenance Manual Rev 3 Page 8 1 8 SYSTEM CONFIGURATION AND CHECKOUT 8 1 Overview 8 2 8 2 System Checkout 8 2 8 3 GPS 175 GNX 375 GNC 355 Configuration 8 2 8 4 Regulatory Test GNX 37...

Page 84: ...s must be loaded to the unit After this is accomplished refer to Section 6 of GPS 175 Part 23 AML STC Installation Manual P N 190 02207 A1 GNX 375 Part 23 AML STC Installation Manual P N 190 02207 A4...

Page 85: ...DS B Out enablement can be verified by tapping the XPDR icon on the right side of the screen and then tapping the Menu button at the top left of the screen 4 Using the transponder test set verify the...

Page 86: ...section and in compliance with 14 CFR 43 9 and 14 CFR 91 417 the aircraft may be returned to service Record the following information in the appropriate aircraft maintenance logs Software versions lo...

Page 87: ...IFIC INFORMATION This appendix contains the documentation required for recording the aircraft specific information including aircraft make model registration number and serial number information This...

Page 88: ..._____________________________________ AIRCRAFT REG ________________________________________________________________ GPS 175 GNX 375 GNC 355 Unit P N ________________________________Mod Level _________...

Page 89: ...tware ___________________Boot Code ___________________FPGA __________________ INTERFACES ARINC 429 RX Port 1 N A TX Port 1 Format ______________ Speed High Low Format ________________ Speed High Low R...

Page 90: ...ocell Response Time _______________sec Slope ____________ Offset _________ Photocell Override Key Backlight Cutoff ________________ Photocell Transition ________________ Configure Lighting Bus Respons...

Page 91: ...On Ground N A Open Ground 0V XPDR AIRFRAME Aircraft Category _________________________________________ Aircraft Width ________________ Meters Aircraft Length ___________________ Meters Max Airspeed __...

Page 92: ...tenance Manual Rev 3 Page A 6 WIRE ROUTING Single Engine The following diagram depicts approximate location of all LRUs and antenna s along with the wire routing for the GPS 175 GNX 375 GNC 355 throug...

Page 93: ...STC Maintenance Manual Rev 3 Page A 7 Twin Engine The following diagram depicts approximate location of all LRUs and antenna s along with the wire routing for the GPS 175 GNX 375 GNC 355 throughout t...

Page 94: ...nstalled by this STC or a markup of the interconnect diagrams from the STC installation manual detailing which equipment was installed and how it was connected NOTE Electrical loads for equipment inst...

Page 95: ......

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