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Page 2-6 GTX 330 Installation Manual
Revision G 190-00207-02
2.7 Cooling Air
The GTX 330 meets all applicable TSO requirements without forced air cooling. The application of
forced air cooling to the rear air nozzle of the GTX 330 is highly recommended to provide beneficial
cooling to the unit.
The GTX 330 was designed to handle a constant interrogation of 450 Pulse Repetition Frequency (PRF)
per second, with short periods of 1200 PRF. Rate limit is set at 1200 PRF. A typical radar site would
interrogate the transponder once every 5 to 10 seconds for approximately 100 milliseconds at a 400 PRF
rate. In very high traffic areas with multiple ground stations and TCAS traffic it is possible to have long
term PRF rates above 450 PRF.
2.8 GTX 330 Installation
2.8.1 Viewing Angle
Ensure that any mounting location will offer sufficient viewing angle. The display has been proven to
meet specifications when seen within the following envelope of viewing positions:
Direction Pilot’s Viewing Angle
Left and Right ±45°
From Top 30°
From Bottom 10°