Apollo 5 Rocket Space Ship Models

On January 22, 1968, Apollo 5 lifted off just before sunset. The Saturn IB worked perfectly, inserting the second stage and LM into a 163 × 222 km orbit. The nose cone was jettisoned, and after a coast of 43 minutes 52 seconds, the LM separated from its adapter, with a 167 × 222 km orbit. After two orbits, the first planned 39-second descent-engine burn was started, but aborted by the Apollo Guidance Computer after only 4 seconds. Shortly before launch there was a suspected fuel leak, and a decision was made to delay arming the engine until the time of ignition.
This change had increased the time required for the propellant tanks to pressurize and thrust to build to the required level. NASA didn’t communicate this change to the AGC programmers. This led to the AGC not measuring any thrust within the predefined time and aborted the maneuver.