747 Squib Test
by jerome meriweather
   

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IRS ON BAT Light Test 2 Switch Test 1 Switch Cargo Squib Test Light APU Squib Test Light ENG Squib Test Lights
747 Photo and/or Graphic Element
  

 

 

ENG Squib Test Lights
Indicates associated Squib circuitry is operative when the TEST switches are pushed.
APU Squib Test Light
Indicates the APU Squib circuitry is operative when the TEST switches are pushed.
Cargo Squib Test Light
Indicates associated Squib circuitry is operative when the TEST switches are pushed.
Test 1 Switch
Tests the circuitry for the "A" bottle Squibs on all engines, the APU bottle Squib and the AFT Squibs on all cargo bottles.
Test 2 Switch
Tests the circuitry for the "B" bottle Squibs on all engines, the APU bottle Squib and the Forward Squibs on all cargo bottles.
IRS ON BAT Light
Indicates one or more IRSs are operating on DC power (APU hot battery bus) only when the airplane is on the ground.