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Flown ‘Power Distribution’ flow chart carried into lunar orbit aboard the Command Module Odyssey during the historic Apollo 13 mission, measuring 16.75 x 10.5 unfolded, signed and flight-certified in black ballpoint, “Flown to the moon aboard Apollo 13, Fred Haise LMP” and “James Lovell, CDR Apollo 13.” The chart, tabbed “PWR DISTR AC,” features a NASA identification legend to the lower right corner, which reads: “Power Distribution Matrix, AC Buses / CSM / 108 Thru 111, Figure 3.2.” In fine condition. An interesting mission-flown flow chart related to the CM Odyssey's allocation and management of AC (alternating current) power. During the Apollo 13 mission, the fuel cells were shut down when a catastrophic explosion in an oxygen tank depleted the available oxygen needed to operate them. As such, power management became critical and engineers and astronauts alike were forced to reconfigure its distribution using checklists like this to conserve enough electricity for reentry.