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TMA44 Audio Panel Installation Manual

7 November 2017

01849-00 Issue

______________________

Trig Avionics Limited

1. Preface

1.1 Purpose

This manual describes the physical and electrical characteristics and the
installation requirements for a TMA44 Audio Panel.

1.2 Scope

This manual applies to the installation of the TMA44 Audio Panel.

1.3 Changes from Previous Issue

No text changes – reformatted for A5.

1.4 Document Cross-References

01848-00

TMA44 Audio Panel Operating Manual

TSO C35d

Airborne Radio Marker Receiving Equipment

FAA

ETSO 2C35d

Radio Marker Receiving Equipment

EASA

TSO C50c

Audio Selector Panels and Amplifiers

FAA

ETSO C50c

Audio Selector Panels and Amplifiers

EASA

Summary of Contents for TMA44

Page 1: ...TMA44 Audio Panel Installation Manual 01849 00 AB 7 November 2017 Trig Avionics Limited Heriot Watt Research Park Riccarton Edinburgh EH14 4AP Scotland UK Copyright Trig Avionics Limited 2017 ...

Page 2: ...This page intentionally left blank ...

Page 3: ...1 2 INTRODUCTION 2 2 1 EQUIPMENT DESCRIPTION 2 2 2 TSO HOLDER 2 3 TECHNICAL SPECIFICATIONS 3 3 1 PHYSICAL SPECIFICATIONS 5 3 2 APPROVAL BASIS 5 3 3 LICENSE REQUIREMENTS 5 4 UNIT AND ACCESSORIES SUPPLIED 6 4 1 EQUIPMENT SUPPLIED 6 4 2 INSTALLATION KIT 6 4 3 REQUIRED ITEMS 7 5 INSTALLATION 8 5 1 UNPACKING AND PRELIMINARY INSPECTION 8 5 2 EQUIPMENT INSTALLATION PROCEDURES 8 5 2 1 Cooling Requirements...

Page 4: ...J1 pin 32 pilot J1 pin 31 co pilot 14 5 3 5 Transmit Interlock 14 5 3 6 Power J1 pin 43 14 5 3 7 Swap Mode J1 pin 11 15 5 3 8 Backlighting J1 pin 41 15 5 3 9 Backlight Voltage Adjustment 15 5 3 10 Middle Marker Sense J1 pin 27 28 17 5 3 11 Unswitched Inputs J1 pin 7 22 24 17 5 3 12 Intercom 17 5 4 ADJUSTMENTS 18 5 5 MARKER ANTENNA INSTALLATION 19 5 6 COMMUNICATIONS ANTENNA INSTALLATION NOTES 19 5 ...

Page 5: ...N AUDIO SELECTION 24 8 6 COCKPIT SPEAKER 24 8 7 SWAP MODE 24 8 8 SPLIT MODE 25 8 9 INTERCOM VOLUME 25 8 10 INTERCOM SQUELCH 25 8 11 INTERCOM MODES 26 8 12 INTERCOM MODE TABLE 27 8 13 MUSIC INPUTS 27 8 14 MUSIC MUTING 27 8 15 MARKER BEACON RECEIVER 28 9 CONTINUED AIRWORTHINESS 29 9 1 CLEANING THE FRONT PANEL 29 10 LIMITED WARRANTY 30 11 ENVIRONMENTAL QUALIFICATION FORM 31 APPENDIX A EXTERNAL PTT HO...

Page 6: ...ation Manual 7 November 2017 01849 00 Issue AB ______________________ iv Trig Avionics Limited Procedures for Telex PT 200 34 Procedures for Telex PT 300 34 APPENDIX B INSTALLATION DRAWINGS 35 APPENDIX C WIRING INTERCONNECT 37 ...

Page 7: ...or a TMA44 Audio Panel 1 2 Scope This manual applies to the installation of the TMA44 Audio Panel 1 3 Changes from Previous Issue No text changes reformatted for A5 1 4 Document Cross References 01848 00 TMA44 Audio Panel Operating Manual TSO C35d Airborne Radio Marker Receiving Equipment FAA ETSO 2C35d Radio Marker Receiving Equipment EASA TSO C50c Audio Selector Panels and Amplifiers FAA ETSO C5...

Page 8: ...he pilot and co pilot position in transmit In Split Mode the TMA44 allows the pilot and co pilot to operate different transmitters independently A fail safe mode connects the pilot headphone and microphone to Com 1 and unswitched input 1 if power is removed for any reason or if the audio panel is turned off by pushing the volume control A four station voice activated VOX intercom is included in th...

Page 9: ...28 VDC Maximum current 1 amp externally protected by a 2 amp circuit breaker Typical operating current 350 mA speaker off 600 mA speaker on 28 VDC requires 15W dropping resistor included Altitude Up to 50 000 feet in a non pressurised area of the cockpit Operating Temperature 20 C to 55 C Storage Temperature 40 C to 85 C Input impedance 510 Input Isolation 70 dB min Speaker Muting 60 dB min Speake...

Page 10: ...ute when Radio or intercom active 1 THD 45 mW into 150 Mic Freq Response 3 dB 350 Hz 6000 Hz Music Freq Response 3 dB 200 Hz 15 kHz Marker Beacon Receiver Frequency 75 MHz Crystal Controlled Marker Beacon Receiver Sensitivity Low 450 µV Hard Factory adjusted to 1400µV Soft High 160 µV Hard Factory adjusted to 150µV Soft Marker Beacon Receiver Selectivity 6 dB at 110 kHz 40 dB at 120 kHz External L...

Page 11: ...0c Audio Amplifiers and TSO C35d Marker Beacon Receivers The TMA44 is EASA authorised under ETSO C50c and ETSO 2C35d ref EASA IM 21O 10028565 All systems comply with RTCA DO 143 DO 160B DO 170 and EUROCAE 1 WG7 70 TSO Holder and Manufacturer PS Engineering Lenoir City TN USA Operation is subject to the following conditions 1 This device may not cause harmful interference 2 This device must accept ...

Page 12: ...1 01849 00 4 2 Installation Kit The TMA44 installation kit includes the following items Unit Description Qty Part Number Cable Clamp 1 625 001 0002 6 32 Clip Nut 6 475 630 0002 6 32 x Phillips flat head screw 6 475 632 0012 4 40 x 7 16 Phillips pan head screw nylon patch 4 475 440 0007 4 40 x 3 8 Phillips truss head screw nylon patch 2 475 440 1038 4 40 x Phillips pan head screw lock washer 2 475 ...

Page 13: ...ng resistor 1 701 015 1501 4 3 Required Items Additional items you will require but which are not in the TMA44 package include Speaker 4 Headphones mono up to 4 as required Microphones up to 4 as required Marker Antenna 75 MHz VSWR 1 1 5 as appropriate Interconnect Wiring Headphone Jacks Up to 4 as required Microphone Jacks Up to 4 as required Circuit Breaker 2 amp ...

Page 14: ...be made save the shipping material and contact the freight carrier Do NOT return units damaged in shipping to Trig If the unit or accessories shows any sign of external shipping damage contact Trig to arrange for a replacement Under no circumstances attempt to install a damaged unit in an aircraft Equipment returned to Trig for any other reason should be shipped in the original Trig packaging or o...

Page 15: ...2 and 6 32 clip nut P N 475 630 0002 The audio selector panel must be supported at front and rear of the mounting tray 5 2 4 Audio Panel Tray and Connector Assembly The rack connectors mate with one 44 pin connector in the TMA44 The connector is a sub miniature crimp type and require the use a hand crimp tool from table below or equivalent The connector is mounted to the tray back plate with 4 40 ...

Page 16: ...onducted electrical noise on the aircraft power bus by at least 50dB Although this is a large amount of attenuation it may not eliminate all noise particularly if the amplitude of noise is very high There must be at least 13 8 VDC present at the bottom connector pin 43 of the TMA44 for the power supply to work in its designed regulation Otherwise it cannot adequately attenuate power line noise Shi...

Page 17: ... under all installation conditions particularly with older avionics 5 3 2 Entertainment Input J1 pin 9 25 Two entertainment devices MP3 player Portable Satellite Radio CD player etc can be connected to the unit Install two 1 8 inch jacks in a convenient location so that the pilot can plug in the entertainment devices into the system NOTE Use the low level output of any entertainment device to conn...

Page 18: ...nd 2 can be paralleled so a single entertainment source can serve both the passengers and the crew in crew mode It is suggested however that a switch DPDT is installed between the single entertainment device and entertainment input 1 This will allow the pilot and co pilot to decide if they hear entertainment while in the Crew mode Local oscillators and internal signals from some entertainment equi...

Page 19: ...p Out 13 Amber Lamp Out 14 Speaker Ground 15 Marker Antenna 16 Co pilot Mic Lo 17 Pilot Mic Low 18 Passenger 1 Mic Lo 19 Passenger Mic Lo 20 Com 1 Lo 21 Com 2 Mic Key 22 Unswitched 2 Hi 23 Nav 2 Audio Hi 24 Audio Low 25 Music 2 Hi 26 Co pilot Phones Hi 27 MM Sense 28 Marker Low 29 Airframe Ground 30 Marker Antenna Ground 31 Co pilot Mic PTT 32 Pilot Mic PTT 33 Passenger Mic Hi 34 Com 2 Mic Audio 3...

Page 20: ...This configuration requires a modified external PTT switch plugged into the co pilot s microphone jack See Appendix A When the co pilot s PTT is pressed the intercom switches the mic audio from pilot to co pilot mic CASE 3 No built in PTT This requires two built in PTTs to be installed or modified external PTT switches to be used Modify external PTT as required See Appendix A 5 3 5 Transmit Interl...

Page 21: ... 1 and 2 by depressing this switch without having to change the mic selector This yoke mounted switch eliminates the need of removing your hands from the yoke to change transceivers 5 3 8 Backlighting J1 pin 41 The brightness of the green audio selection indicators is automatically controlled by a photocell located in the centre of the unit The brightness of the buttons is set by the dimmer contro...

Page 22: ...__________ Page 16 Trig Avionics Limited Figure 5 1 Screw Locations 2 Remove the jumper located in the back corner away from the sub D connector from both pins of J9 See Figure 5 2 3 Place the lid back on the unit aligning holes 4 Install and tighten the 4 screws into the lid 4 screws ...

Page 23: ...cific autopilots and goes high only when a middle marker signal is received not in test 5 3 11 Unswitched Inputs J1 pin 7 22 24 The TMA44 has two unswitched inputs Pin 7 and pin 22 are unswitched unmuted inputs that are heard by the crew and over the cockpit speaker at all times 5 3 12 Intercom All mic and headphone monaural jacks must have insulating washers the cable must be Teflon coated twiste...

Page 24: ...st aircraft configurations There are four adjustments however that will allow the installer to tailor the specific functions Adjustment Clockwise Results In Cabin Speaker Level Increase Speaker Volume Marker Beacon Level Decrease Marker Volume MKR High Sense Increase sensitivity MKR Low Sense Increase Sensitivity To make the necessary adjustments use a small jeweller s slotted screwdriver Figure 5...

Page 25: ...Any antenna relocation must be accomplished in accordance with AC 43 13 2B aircraft manufacturers recommendations and FAA approved technical data Warning It is probable that radio interference will occur in the split mode when the frequencies of the two aircraft radios are adjacent and or the antennas are physically close together Trig makes no expressed or implied warranties regarding the suitabi...

Page 26: ...l damage and void Trig s warranty 1 Apply power to the aircraft and avionics 2 Plug headsets into the pilot co pilot and occupied passenger positions 3 Verify fail safe operation by receiving and transmitting on COM 1 from the pilot position with the audio panel power off 4 Switch on the unit by pressing the volume VOL knob 5 Check intercom operation 6 Push the XMT1 select button 7 Verify that bot...

Page 27: ... in the lower button row blinks when either push to talk is keyed 15 Verify proper Intercom system operation in the ALL ISO and CREW modes see Section 8 12 16 Verify that the audio selector panel system does not adversely affect any other aircraft system by systematically switching the unit on and off while monitoring the other avionics and electrical equipment on the aircraft 6 3 Marker Checkout ...

Page 28: ...ge while examining the installation to see that no mechanical interference exists Verify that the cables are secured to the aircraft structure in accordance with good practices with adequate strain relief Ensure that there are no kinks or sharp bends in the cables and coaxial cables Verify that the cables are not exposed to any sharp edges or rough surfaces and that all contact points are protecte...

Page 29: ... is turned off or if power is removed the audio panel will be placed in the fail safe mode In the off or fail safe mode the pilot is connected directly to Com 1 and to unswitched input 1 allowing transmit receive and alert capability regardless of audio panel condition 8 3 Transmitter Selection To select a radio for transmission press either the XMT1 or the XMT2 button the green indicator lamp abo...

Page 30: ... DME ADF and AUX buttons select the switched navigation receivers Press once to turn on the corresponding source press again to turn it off A green lamp above the button will light indicating which audio source is selected 8 6 Cockpit Speaker This button will place all selected audio on the cockpit speaker when active Note In Split mode see below only unswitched inputs will play through the speake...

Page 31: ...ling agents Note Due to the nature of VHF communications signals and the size constraints in general aviation aircraft it is probable that there will be some transmission bleedover in Split Mode particularly on adjacent frequencies Split Mode may not be suitable in all aircraft conditions 8 9 Intercom Volume Turning the volume control knob the smaller inner knob on the left side of the audio panel...

Page 32: ...ilot to tailor the intercom function to best meet the situation it cycles through the following modes from top to bottom PILOT The pilot is isolated from the intercom and is connected only to the aircraft radios Co pilot and passengers will hear the intercom and Music 1 but not the aircraft radio receptions or pilot transmissions ALL All parties will hear the aircraft radios intercom and Music 1 C...

Page 33: ...e allows all on board to hear radio reception as well as communicate on the intercom Crew Radios Sidetone Co pilot Music 1 Radios Sidetone Pilot Music 1 Passengers Music 2 A second music source is automatically enabled for the passengers 8 13 Music Inputs The audio selector panel has provisions for up to two separate music input devices Which device is heard is determined by the intercom mode sele...

Page 34: ...n the aircraft is in the range of the outer marker The amber middle marker lamp is coupled with a 1300 hertz tone keyed alternately with short dot and long dash bursts at 95 combinations per minute The white inner marker lamp has a 3000 hertz dot tone The lamp and tone are keyed at a rate of six times per second The sensitivity SENS button can be used to change the marker beacon receiver sensitivi...

Page 35: ...that there are no periodic service requirements necessary to maintain continued airworthiness and no maintenance is required until the equipment does not properly perform its intended function When service is required a complete performance test should be accomplished following any repair action Repairs should only be carried out in accordance with Trig Avionics Limited service procedures 9 1 Clea...

Page 36: ...normal wear All warranties are F O B Trig Avionics Limited Heriot Watt Research Park Riccarton Edinburgh EH14 4AP Trig Avionics will not accept or pay for any charges for warranty work performed outside our factory without prior written consent This warranty applies only to products in normal use It does not apply to units or circuit boards defective due to improper installation physical damage ta...

Page 37: ...4 5 2 55 C Altitude 4 6 1 50 000 feet Equipment tested to Category D1 Temperature Variation 5 0 Equipment tested to Category C Humidity 6 0 Equipment tested to Category A Shock 7 0 Equipment tested to Category B Vibration 8 0 Equipment tested to Category M Standard Explosion 9 0 Equipment identified as Category X no test required Waterproofness 10 0 Equipment identified as Category X no test requi...

Page 38: ...tage Spike 17 0 Equipment tested to Category B Audio frequency conducted susceptibility 18 0 Equipment tested to Category B Induced signal susceptibility 19 0 Equipment tested to Category B Radio frequency susceptibility 20 0 Equipment tested to Category A Radio frequency emission 21 0 Equipment tested to Category A Lightning induced transient susceptibility 22 0 Equipment not tested ...

Page 39: ...o pilot s mic jack see modification details below When the co pilot s PTT is depressed this activates an internal relay that switches the mic audio to the aircraft radio from the pilot to the co pilot CASE 3 No built in PTT switch at all Two built in PTT must be installed or two external modified PTT switches will be required for both the pilot and co pilot see modification details below Push To T...

Page 40: ... Telex PT 200 1 Unscrew the round black plastic cover from the jack 2 Cut the red wire in the middle of the wire 3 Strip both ends of the insulation 4 Solder the two ends to the ground lug to the PTT jack 5 Replace the round black plastic cover Procedures for Telex PT 300 1 Unscrew the round black plastic cover from the plug jack 2 Remove the heat shrink material from the joined black wires 3 Sold...

Page 41: ...awings are not to scale 431 891 0100 Retaining Block 44 pin connector Rack back plate 430 890 0050 475 440 0007 4 ea 475 440 1038 2 Rack 430 890 0040 Ø0 20 in 8 plcs Ø0 50 in 2 plcs J1 Viewed from Back 15 30 44 1 16 31 Ground Lug Ground Lug 475 440 0001 x2 Back plate assy 475 009 0001 ground lug x2 475 440 0001 x2 Screw w washer Ground lug detail Not used ...

Page 42: ...9 00 Issue AB ______________________ Page 36 Trig Avionics Limited 0 37in 3 87in 5 53in 6 04in 0 36in 0 96in 1 28in 6 31in 1 28in Caution Apply steady pressure to the bezel while screwing the unit into the tray to ensure even seating of the unit and connectors ...

Page 43: ...TMA44 Audio Panel Installation Manual 7 November 2017 01849 00 Issue AB ______________________ Trig Avionics Limited 37 Appendix C Wiring Interconnect ...

Page 44: ...Marker lamp Blue External Marker lamp Amber MM Sense Marker Low 15 30 RG 58A U Coax Marker Antenna 11 Swap 41 43 29 14 28V Lights Hi 14 28V Low 15 Ω 15W 28V Installation only 11 33V Airframe Ground 1 All shields should be grounded at audio panel only Other ends remain floating 2 All phone and mic jacks must be floating from ground Use insulating washers 3 All wiring to conform to MIL 22750 or 2750...

Page 45: ...TMA44 Audio Panel Installation Manual 7 November 2017 01849 00 Issue AB ______________________ Trig Avionics Limited 39 This page intentionally left blank ...

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