011-00779-10

Remote Mode S operation in an integrated suite

In service, the GTX 33 receives interrogation signals through the aircraft transponder antenna and produces Mode A, altitude-reporting and Mode S replies according to the configured installation. The crew interface normally resides in an integrated Garmin display system rather than on the transponder enclosure. This arrangement reduces panel space while keeping the surveillance hardware accessible in a remote avionics location.

A typical functional chain is crew command from the compatible display, configuration and altitude data through the avionics network, reply processing in the GTX 33, and radio-frequency transmission through the approved antenna and coaxial cable. The altitude source, control display, antenna, rack and wiring are associated equipment and are not included with this unit unless specifically listed in the quotation.

Exact -10 standard and Extended Squitter distinction

The 011-00779-10 configuration must not be described automatically as a GTX 33ES. Garmin service information distinguishes this standard GTX 33 Part Number from Extended Squitter configurations and indicates that the -10 hardware requires an approved upgrade before the ES option can be enabled. This difference is operationally important because outwardly similar remote boxes may carry different approval and surveillance capabilities.

When replacing or upgrading equipment, maintenance personnel should verify the full Part Number, software and hardware status, aircraft approval and intended ADS-B architecture. A GTX 33ES or another suffix is not automatically a direct substitute for 011-00779-10. Conversely, the standard -10 unit should not be represented as meeting an ES requirement unless the approved modification and configuration records confirm it.

Installation, inspection and bench testing

The label confirms compatibility with 14- or 28-volt aircraft electrical systems, but the actual installation must use the correct rack, connector, circuit protection, altitude source, data interface and antenna arrangement. Cooling, bonding and coaxial-cable loss should be checked against current Garmin instructions. A transponder fault can be caused by the integrated display, configuration data, altitude encoder, antenna or wiring as well as by the LRU itself.

Receiving inspection should cover the exact 011-00779-10 plate, serial number, connector contacts, mounting rails, enclosure, evidence of moisture and unauthorized repairs. An approved bench procedure should confirm power-up, control communication, code and mode response, altitude reporting, IDENT, receiver sensitivity, transmitter frequency and output power. Aircraft return-to-service tests remain required after installation.

Serviceable supply and ordering information

This 011-00779-10 GTX 33 is offered in Serviceable condition from partner stock with a six-month warranty. Because the exact source photograph provides the clearest identification evidence, the catalog images preserve the original label and real enclosure rather than replacing its technical markings with generated text. The pictured serial number documents the reference unit only and should be confirmed before serial-specific supply.

For an inquiry, specify Part Number 011-00779-10, model GTX 33, aircraft type, integrated display system, bus voltage, required surveillance capability, modification status, documentation and quantity. Related surveillance and integrated-avionics products can be reviewed in the Garmin / BendixKing / Honeywell / Collins category. Related equipment is not automatically interchangeable.