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A nozzle extension igniter boss, with its protective closure (located beneath the heat exchanger).

The turbine exhaust, fed into the nozzle extension to provide film cooling, was fuel-rich. Two igniters on the nozzle extension reignited the gas in the nozzle extension.

Picture 2 of 2.

 
nozzle extension igniter boss, with its protective closure on F-1 Engine (Building 4200) at Marshall Space Flight Center
Time picture taken Thu Sep 12 07:41:58 2013
Location picture taken Building 4200
Marshall Space Flight Center
Huntsville, AL
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