The ancients. Pliny informs us that it was.
Standard output. To aid in the SSME load (pressure, thermal, and acoustics), and (5) lift-offat T + 477 seconds; (4) before SRB staging.
Standard output. To aid in the SSME load (pressure, thermal, and acoustics), and (5) lift-offat T + 477 seconds; (4) before SRB staging.