Page A-6 GTX 320/320A Installation Manual
Rev M 190-00133-01
A.3 Environmental Qualification Form (GTX 320A)
Nomenclature: GTX320A Airborne ATC Transponder Equipment
Type/Model/Part No.: 010-00247-( ) TSO - C74c Class 1A
(Includes 011-00728-( ))
Manufacturer's Specification And/Or Other Applicable Specification: 004-00111-00
Manufacturer: Garmin Corporation
Address: 1200 E 151st St., Olathe, Kansas 66062
Table A-2 GTX 320A EQF Table
Conditions RTCA DO-
160D Section
Description of Conducted Tests
Temperature and Altitude 4.0 Equipment tested to Categories A1 & D1
Low Temperature 4.5.1
High Temperature 4.5.2. & 4.5.3
In-Flight Loss of Cooling 4.5.4 Cooling Air Not Required
Altitude 4.6.1
Decompression 4.6.2
Overpressure 4.6.3
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 in each aircraft type to aircraft
zone 2. Aircraft Type 2 and 6 were tested to
Category S2, Vibration level B2. Aircraft Type 3, 4
and 5 were tested to Category S, Vibration level M.
Note: Vibration level M modified to increase level
to RTCA DO-160C Curve N for Helicopters as
follows-0.1 inches peak-to-peak double amplitude
from 5 Hz to 17 Hz, 1.5 g-Pk from 17 Hz to 500 Hz.
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
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