747 Master Warning / Caution Lights
by jerome meriweather
   

Inward to EFIS
Outward to Capt's Side Panel or F/O's Side Panel

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Master Caution Light Master Warning Light
747 Photo and/or Graphic Element
  

 

 

Master Warning Light
Indicate engine, APU, wheel well, or cargo fire.

Lights are inhibited for fire warnings from V1 to 400 feet radio altitude or 25 seconds after V1, whichever occurs first.

Pushing either light silences the fire bell.
Master Caution Light Indicate engine overheat. Lights are inhibited above 80 knots until reaching 400 feet radio altitude or 20 seconds after rotation or decreasing speed through 75 knots whichever occurs first.

Pushing either light silences the caution beeper.