Skip to content
Apollo 11

Command and Service Module Columbia

Columbia (CSM‑107) was the Apollo 11 Command and Service Module — the mother ship that carried all three astronauts to and from lunar orbit and was the only part of the spacecraft to return to Earth. Michael Collins piloted it solo in lunar orbit while Armstrong and Aldrin descended in Eagle.

The Service Module propulsion system performed lunar orbit insertion (into an orbit of roughly 60×170 then 66×54 nautical miles), the plane change for rendezvous, and transearth injection out of lunar orbit. The Command Module housed the crew during launch, translunar/transearth coast, and atmospheric entry; before entry the Service Module was jettisoned using its reaction control system. After the surface crew returned and transferred over with film and samples, Columbia jettisoned the LM ascent stage and brought the crew home to a Pacific splashdown and quarantine.

Collins’ own review of his solo time (Technical Crew Debriefing Vol 2, §11) is reassuringly dull: CSM circumlunar operations “went smoothly… there were no surprises… it didn’t have any failures.” Much of his attention went to P22 landmark tracking, trying — with the ground, which also didn’t know — to fix exactly where Eagle had landed; he scanned for a specular glint off the LM and “never saw any.” He also judged the command module should carry “plenty of film” so the pilot can shoot freely without rationing.

The engineering record adds a counterpoint to that verdict: the Mission Report’s Anomaly Summary (§16.1) logs eleven CSM anomalies — mostly instrumentation- or redundancy-level (a biased oxygen-flow reading, nuisance master alarms, dead display segments, a redundant-system nitrogen leak), but including the two anomalies still open when the report was published: the glycol temperature-control valve, whose gear-train bearing retainer was found disengaged (§16.1.10), and the jettisoned Service Module’s entry behavior — instead of skipping out of the atmosphere as predicted it passed the crew “really spinning” and disintegrated near the CM (§16.1.11). One anomaly answers Collins directly: the yaw-left thruster he flagged in flight as “a possible systems problem” (working on direct but not automatic coils) traced postflight to two loose pins in a 1966-built terminal board (§16.1.3). Collins’ “no failures” stands for circumlunar performance — none of the eleven cost the mission an objective — but the gauges were not as dull as the ship. The full transcription is in the anomalies and malfunctions register.

Section titled “Related”

Sources

Section titled “Sources”

Topics

Section titled “Topics”