747 TCAS/Transponder Controls
by jerome meriweather
   

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Transponder Selector IDENT Button FAIL Light (red) Code Selector Knobs TCAS / XPDR Selector Code Indicator Absolute / Relative Altitude Switches Absolute / Relative Altitude Switches Above / N / Below Switches Above / N / Below Switches
747 Photo and/or Graphic Element
  

TCAS consists of 2 Mode S Transponders, a TCAS/Transponder control panel, a computer processor, a TCAS EFIS control panel, 2 NDs capable of traffic display, a voice message system, 2 PFDs capable of pitch guidance to avoid transponder-equipped airplanes, and 2 directional antennas (one top and one bottom).

 

Above / N / Below Switches
Left switch controls Captain's ND and right switch controls First Officer's ND.
Absolute / Relative Altitude Switches (ABS / REL)
Left switch controls Captain's ND and right switch controls First Officer's ND.
Code Indicator
Indicates code selected with the Code Selectors.
TCAS / XPDR Selector
Code Selector Knobs
FAIL Light ( Red )
Indicates a system failure of the selected transponder. Comes on momentarily during TCAS TEST.
IDENT Button
Causes the word IDENT to flash in the aircraft data block on the ATC display.
Transponder Selector