Trig TX56A Complete NAV/COM FAA TSO

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Part# 11-16838
MFR Model# 01955-00-01


Trig’s TX56 Nav/Com units provide the ideal platform to update legacy avionics or equip your new aircraft. Slimline and highly efficient both Nav/Com models are housed within a superbly engineered case. At only 33mm high each unit saves valuable space yet contains an impressive selection of practical features for any pilot.

The TX56 is available with 8.33 kHz channel spacing or conventional 25 kHz spacing, with 10 Watt or 16 Watt transmit power.The TX56A and TX57A are 760 channel radio versions (non 8.33 kHz for use outside Europe).
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  • Slimline – only 33mm high
  • Bright, clear display / simple user interface
  • Unique ‘Push Step’ for faster tuning
  • Dual Watch – monitor two com or two nav frequencies at the same time
  • ETSO and TSO approval (pending)
  • Stereo music / two place intercom
  • ‘Say Again’ feature – allows playback of last transmission
  • USB port on facia – upload over 200 com and nav frequency database (CSV file)
  • VOR/ILS receiver – monitor a 2nd VOR
  • Built in VOR/LOC converter
  • Built in digital CDI
  • Built in 40 channel glide slope receiver
  • Highly efficient – no cooling fans or external cooling required
  • Ideal retro-fit for legacy radios – unit is same height as an SL30
  • Unbeatable quality – designed and manufactured in the U.K.
  • Two year worldwide warranty

  • Push Step:The Nav/Com display is clear and bright, showing both primary and secondary frequencies along with airfield / VOR identifiers. A ‘Push Step’ knob allows the fastest change from 8.33 kHz to 25 kHz (TX56/TX57) or 25 kHz to 50 kHz (TX56A/TX57A)- so you can tune the Nav/Com quickly without compromising your look-out. Dual Watch feature allows you to monitor two Com or Nav frequencies at the same time – it’s like having a second radio.

    Say Again:The radio has a ‘Say Again’ feature. A single button press replays the last radio transmission. This feature is ideal for student pilots, but every pilot can get distracted, so it avoids the embarrassment of asking air traffic to repeat a message.

    VOR:The Nav receiver is optimized to provide stress free operation. Both the TX56 and TX57 will decode Morse, identifying VORs or ILS. The Nav receiver can monitor a second VOR which significantly enhances route navigation. This means that a standby VOR radial can be displayed in addition to the primary VOR – allowing the pilot to quickly calculate an accurate position fix.

    Built in CDI:The unit display features a graphical CDI (course deviation indicator) This allows the pilot to navigate without an external CDI. The TX56 also provides support for various display options, using a range of external cockpit instruments.
    Once tuned the Nav receiver can identify the station by de-coding its Morse identifier, automatically identifying the selected VOR. Automatic centering of the CDI needle displays a direct bearing to a selected VOR for ease of navigation whilst the to/from button allows you to display the inbound or outbound radial.

    Product Design:The Nav/Com’s low profile design requires no external cooling fans. The compact size and features make it a great choice for both forward and retro-fit installations. Each Nav/Com is designed to easily integrate with legacy products, these include the popular SL30 which is the same height as a TX56. Customers replacing legacy KX155 and KX165 models will easily accommodate a TX56 in their stack, in all cases a TX56 tray will need to be fitted.


    Specification TX56A
    Type Certified
    Certification ETSO 2C128, 2C169a, 2C34f, ETSO 2C36f, 2C40c
    TSO-C128a TSO-C169a, C34e, TSO-C36e, C40c
    Compliance ED-23C, ED-67, DO-186B, DO-178B
    Level B, DO-160G, DO-254 Level C
    Supply Voltage (DC) 11 – 33 V
    Typical Current Consumption (at 14v) (at 14V) receive: 265 mA transmit: 2A
    Nominal Transmitter Power 10 Watt
    Operating Temperature -20°C to +55°C
    Cooling Requirement No fan required
    Weight 1.1 kg / 2.42 lbs
    Dimensions (mm) controller: H 44 x W 63 x L 54 mm
    transponder in tray: H 48 x W 68 x L 160 mm
    Dimensions (inches) 33 x W 159 x L 270 mm
    Installed Depth in Tray (inches) 9.05” long



    Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

    Q: Will the Trig TX56A Complete NAV/COM FAA TSO fit in a KX155 tray?

    Per Trig: Customers replacing legacy KX155 and KX165 models will easily accommodate a TX56 in their stack, however, in all cases a TX56 tray will need to be fitted. The original tray will need to be replaced.

    Q: Do these Trig TX56A radios come with the complete mounting hardware/accessories (mounting tray, connectors)?

    The TX56 comes with an install kit which includes the tray, d-subs and pins etc.

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