Step 7

After the engine is attached to the thrust measurement system, the engine's nozzle extension (or "skirt") is lifted to the platform and attached to the engine. Some tests, however, were conducted without the nozzle extension.

Nozzle extension attached to F-1 rocket engine in F-1 Test Stand

Photo Credit HABS/HAER via Marshall Space Flight Center
Extraction and adaptation by heroicrelics
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