Apollo 12 launches on second lunar landing mission targeting Oceanus Procellarum

Less than four months after Apollo 11's success, NASA launched Apollo 12 on November 14, 1969, from Launch Complex 39A at the Kennedy Space Center. The mission crew comprised Commander Charles "Pete" Conrad Jr., Lunar Module Pilot Alan L. Bean, and Command Module Pilot Richard F. Gordon Jr. Apollo 12 was tasked with transitioning from basic landing survival to precise scientific exploration, targeting a site in Oceanus Procellarum (the Ocean of Storms) near the robotic Surveyor 3 lander, which had been resting on the lunar surface since April 1967.

At 11:22:00 EST, the 363-foot Saturn V rocket lifted off into rain clouds over Cape Canaveral. Exactly 36.5 seconds into flight, a lightning strike hit the rocket, traveling down the ionized exhaust plume to the ground pad. The electrical discharge tripped all three fuel cell circuit breakers in the Command Module Yankee Clipper, knocking out main electrical power and corrupting flight instrument displays in the cockpit while flooding Mission Control telemetry with incomprehensible static. A second lightning strike occurred 52 seconds after launch, disrupting the spacecraft's primary inertial measurement system.

Inside Mission Control, 25-year-old Electrical, Environmental, and Consumables Manager (EECOM) John Aaron recognized the pattern of garbled telemetry from a previous ground simulation test. He immediately instructed Flight Director Gerry Griffin and CAPCOM Gerald Carr to tell the astronauts: "Try SCE to AUX." Astronaut Alan Bean quickly reached for the Signal Conditioning Equipment switch and flipped it from Primary to Auxiliary position. The telemetry restored instantly, allowing Pete Conrad to re-engage the fuel cells and reset the electrical grid. The Saturn V's independent instrument unit had maintained guidance throughout the strikes, allowing Apollo 12 to safely reach Earth parking orbit and proceed to the Moon.

Why it matters

The launch of Apollo 12 proved the resilience of both NASA's mission hardware and ground control team under extreme operational crisis. A double lightning strike during lift-off could easily have forced a launch abort or destroyed the spacecraft. Split-second memory recall by flight controller John Aaron saved the mission, demonstrating the high standards of training and problem-solving that defined the Apollo program.

Interesting fact

The Saturn V rocket actually triggered its own lightning strikes; the rocket's long, electrically conductive stream of ionized exhaust gases functioned as a massive lightning rod extending into charged storm clouds.