User's Manual

TT21 Transponder Installation Manual 19 January 2009
00560-00 Issue AA
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4.4 Required Items
Additional items you will require, but which are not in the TT21 package, include:
 Antenna and fixing hardware. The TT21 is compatible with any transponder antenna
approved to ETSO C74 or 2C112.
 Cables. You need to supply and fabricate all required cables. Guidance on cable types is
given in section 5 below.
 Fixings. To secure the transponder tray to the airframe you will need at least 3 flat head
screws and three self-locking nuts. If the aircraft does not have existing mounting provisions
you may need to fabricate additional brackets to support the transponder tray.
To support the optional ADS-B features a GPS receiver with an appropriate serial output is required.
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