The Explorers' Club, № CMXLI

Operation AXIOM: Destination Moon—The 60th Anniversary of Saturn-Apollo 4
28 March 1963: Saturn-Apollo 4 (Saturn I S.A.-4) lifted off from Florida's Cape Canaveral Air Force Station on a suborbital flight; the № 5 H-1 engine was deliberately shut down 100 seconds into the flight & fuel was re-routed automatically to the other seven engines, which then burned longer to compensate for the loss of thrust; S.A.-4 was the final single-stage test flight of a Saturn rocket.

Commentary: Testing the scenario of an engine shutting down & the other engines burning longer to compensate proved fruitful, as this occurred unplanned during the launches of Apollo 6 in 1968 (an uncrewed test flight) & of Apollo 13 in 1970.

Semper exploro.