Apollo 5
In 1962, NASA awarded a contract to Grumman Aircraft in Bethpage, New York. This agreement tasked the company with building the Lunar Module for the Apollo program. Major General Samuel C. Phillips hoped that LM-1 would launch by April 1967. He needed the vehicle delivered to Kennedy Space Center by September 1966. Manufacturing difficulties caused repeated delays throughout the process. The Saturn IB rocket planned for this mission sat at Launch Complex 37 in January 1967 without a lunar module attached. A fire that killed three astronauts in January 1967 changed everything. The original AS-204 booster survived unscathed and was moved from Launch Complex 34. It replaced the AS-206 rocket intended for the first test flight. Grumman built a plywood mockup of the module to verify facilities while waiting for the real hardware. LM-1 finally arrived on board Aero Spacelines' Super Guppy aircraft on the 23rd of June 1967. Stages were mated four days later but leaks forced demating multiple times. John J. Williams led a team of 400 people checking specifications during these months. Leaks in the ascent stage required repairs and remating efforts through August and September. By late 1967, mission documents were ready despite propulsion system issues. Mission Director William C. Schneider issued rules on the 18th of November 1967. An abbreviated countdown began on the 21st of January 1968 after minor faults like clogged filters.
AS-204 had been assigned to Apollo 1 before the fatal fire at Cape Kennedy. This Saturn IB rocket sat at Launch Complex 34 when the tragedy occurred. It survived the blaze without damage and underwent inspection for corrosion. NASA decided to use this specific booster for the Lunar Module's first flight. The decision came because AS-204 was the last Saturn IB with full research instrumentation. Crewed flights were on hold following the accident, so engineers needed a test vehicle. The rocket arrived at Cape Kennedy in August 1966. It waited years while LM-1 struggled through manufacturing delays. The spacecraft-lunar module adapter SLA-7 housed the lunar module inside the stack. Four panels opened once the nose cap jettisoned in orbit. The vehicle stood tall but appeared stubby without a command module or escape system. Ignition weight included the spacecraft and propellant totaling roughly 500,000 pounds. The absence of landing legs saved weight since no astronauts would fly. Windows from LM-5 replaced those on LM-1 due to breakage concerns. Aluminum plates covered the openings instead of glass panes. No crew members flew aboard during this uncrewed mission.
Apollo 5 lifted off from Launch Complex 37B at 17:48:08 Eastern Standard Time. The Saturn IB inserted the second stage into an elliptical orbit. After 43 minutes and 52 seconds of coasting, the lunar module separated. The first planned descent-engine burn lasted only four seconds before aborting automatically. The Apollo Guidance Computer detected the craft was not moving fast enough. One engine valve leaked propellant until ignition time in orbit. Propellant took longer to reach the engine than expected. Tanks were half full which contributed to the slow movement. Programmers had not been told they could adjust software for this lag. Had astronauts flown, they might have restarted the engine manually. Flight Director Gene Kranz ordered manual control to complete tests. Communication problems plagued the spacecraft throughout the operation. Kranz's team decided to conduct fire-in-the-hole procedures under manual command. They successfully accomplished every required engine burn despite these hurdles. The ascent stage spun out of control eight hours after burns finished. A guidance system problem caused the spin. Atmospheric drag eventually decayed orbits causing re-entry. The ascent stage burned up on January 24 while the descent stage fell into the Pacific.
The automatic abort occurred because the computer detected speed discrepancies. One valve remained unarmed until ignition time in orbit. This delay meant propellant took longer to reach the engine chamber. Tank levels at fifty percent capacity worsened the situation further. Engineers could have adjusted software but received no instructions to do so. The lag between valve opening and engine firing confused the guidance system. Without crew members to analyze the data, the computer made the call. It aborted the four-second burn automatically. The mission rules allowed for alternate procedures when primary plans failed. Kranz's team switched to manual control immediately. They verified that the ascent stage could still fire while attached to the descent stage. This procedure was critical for lunar surface operations or aborted landings. The term fire-in-the-hole came from mining terminology regarding explosives. Testing included restarting engines after initial use. Additional checks ensured LM systems functioned correctly. The Instrument Unit in Saturn V configuration also underwent testing. All subsystems required verification before human crews could fly. The successful completion of these tests proved the hardware worked despite errors.
Gene Kranz served as flight director during this historic test flight. He commanded Mission Control in Houston throughout the operation. Communication problems with the spacecraft threatened mission success. Omitting certain tests would have declared the entire effort a failure. Kranz decided to conduct engine and fire-in-the-hole tests under manual control. His team overcame communication issues to complete every required burn. Christopher C. Kraft sat at the left console during the event. Robert R. Gilruth directed Manned Spaceflight Center operations nearby. George M. Low praised the outstanding flight control teams later. He credited Kranz's able leadership for the mission outcome. The ascent stage spun out of control eight hours into the mission. A guidance system problem caused the rotation after burns finished. Despite the spin, all objectives were met successfully. Simulations showed the S-IVB stage re-entered about 15.5 hours into flight. The descent stage fell into the Pacific Ocean southwest of Guam on February 12. Atmospheric drag ensured orbits decayed quickly enough for re-entry. The ascent stage burned up on January 24 following its separation. No human lives were lost during these uncrewed operations.
NASA deemed Apollo 5 successful despite technical difficulties encountered mid-flight. George M. Low stated the hardware was good and teams were outstanding. The mission demonstrated LM systems worked as intended. A second uncrewed test using LM-2 was cancelled immediately afterward. This decision advanced plans to land an astronaut by the end of the decade. The first crewed lunar module flight occurred on Apollo 9 in March 1969. The Saturn IB rocket had inserted the vehicle into orbit perfectly. The nose cone jettisoned allowing the lunar module to separate cleanly. Stages remained in low orbits until atmospheric drag pulled them down. The ascent stage re-entered atmosphere on January 24 and burned completely. The descent stage entered on February 12 falling into the Pacific Ocean. Simulations indicated the S-IVB stage re-entered roughly 15.5 hours after launch. All objectives regarding subsystem verification were accomplished successfully. The cancellation of a follow-up test saved time and resources. Engineers moved forward with preparations for manned missions. The Lunar Module would eventually carry astronauts to the Moon's surface. This single flight proved the complex machine could operate safely.
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Common questions
When did Apollo 5 launch and what time was it?
Apollo 5 lifted off from Launch Complex 37B at 17:48:08 Eastern Standard Time on the 21st of January 1968. The Saturn IB rocket inserted the second stage into an elliptical orbit shortly after liftoff.
Who built the Lunar Module for the Apollo program?
NASA awarded a contract to Grumman Aircraft in Bethpage, New York in 1962 to build the Lunar Module. Major General Samuel C. Phillips hoped that LM-1 would launch by April 1967 but manufacturing difficulties caused repeated delays.
Why did Apollo 5 use the AS-204 booster instead of a new rocket?
The original AS-204 booster survived the fire that killed three astronauts in January 1967 without damage. NASA decided to use this specific booster because it was the last Saturn IB with full research instrumentation available for testing.
What happened to the ascent stage and descent stage after the mission ended?
The ascent stage burned up on January 24 while the descent stage fell into the Pacific Ocean southwest of Guam on February 12. Simulations showed the S-IVB stage re-entered about 15.5 hours into flight before atmospheric drag decayed the orbits.
How many people worked on checking specifications during the Apollo 5 preparation months?
John J. Williams led a team of 400 people checking specifications during these months. Leaks in the ascent stage required repairs and remating efforts through August and September before mission documents were ready.