In the Lockheed L-1011 cockpit the transponder is located on the center console. A three-position transponder select switch is provider in most cases:
- #1, #1 transponder is being used, #2 Standby
- Standby, both transponders are warmed up (as long as power on aircraft) but neither is operating.
- #2, #3 transponder is being used, #1 in Standby
The mode select switch determines whether A domestic or B international coding is being used. (More modern devices include other modes as well as TCAS).
A three-position altitude reporting switch is provided:
- #1, ADC #1 is being used for altitude reporting
- OFF ... the system is off
- #2, ADC #2 is being used for altitude reporting
The fault light indicates a fault within the selected system (amber). This should prompt the pilots to select the other transponder. The IDENT button provides an additional pulse reply. IDENT pulse lasts for 20 seconds after IDENT button is release.
Pushing the test button also illuminates the REPLY light.
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