TT31 Transponder Installation Manual 1 February 2010
00455-00 Issue AJ
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Because the ETSO for ADS-B was published later than the ETSO for transponders it refers to a later
edition of the environmental standard, ED-14E/DO-160E, rather than ED-14D/DO-160D. The
following form provides the environmental data in DO-160E format. The two tables are equivalent.
Nomenclature TT31 Mode S Transponder
Part Number: 00220-(XX) ETSO: C166a
Manufacturer Trig Avionics Limited
Address Heriot Watt Research Park, Riccarton, Currie, Scotland, EH14 4AP
Conditions DO-160E Description of Conducted Tests
Temperature and Altitude 4.0 Equipment tested to Categories A4, C4
Low temperature ground survival 4.5.1 -55°C
Low temperature operating 4.5.1 -20°C
High temperature operating 4.5.3 +55°C
High temperature short-time operating 4.5.2 +70°C
High temperature ground survival 4.5.2 +85°C
Loss of Cooling 4.5.4 Cooling air not required (+70°C operating without cooling air)
Altitude 4.6.1 35,000 feet
Decompression 4.6.2 8,000 to 35,000 feet in 15 seconds
Overpressure 4.6.3 -15000 feet
Temperature Variation 5.0 Equipment tested to Category C
Humidity 6.0 Equipment tested to Category A
Operational Shocks 7.2 Equipment tested to Category B
Crash Safety 7.3 Equipment tested to Category B and extended to use test
levels for Helicopters
Vibration 8.0 Aircraft zone 2; type 3, 4, 5 to category S level M
Equipment at strike-off level 3 also tested for aircraft zone 2;
type 1 (Helicopters) to category U level G
Explosion 9.0 Equipment identified as Category X – no test required
Waterproofness 10.0 Equipment identified as Category X – no test required
Fluids Susceptibility 11.0 Equipment identified as Category X – no test required
Sand and Dust 12.0 Equipment identified as Category X – no test required
Fungus 13.0 Equipment identified as Category X – no test required
Salt Spray 14.0 Equipment identified as Category X – no test required
Magnetic Effect 15.0 Equipment tested to Category Z
Power Input 16.0 Equipment tested to Category B
Voltage 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 AC
Radio frequency susceptibility 20.0 Equipment tested to Category T
Radio frequency emission 21.0 Equipment tested to Category B
Lightning induced transient susceptibility 22.0 Equipment identified as Category XXXX – no test required
Lightning direct effects 23.0 Equipment identified as Category X – no test required
Icing 24.0 Equipment identified as Category X – no test required
Electrostatic Discharge 25.0 Equipment identified as Category X – no test required
Fire, Flammability 26.0 Equipment identified as Category C
Trig Avionics Limited Page 29
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