Space Rocket History #122 – Apollo: Serious Problems with the Lunar Module and Grumman
Toward the end of January 1967, it was revealed that Lunar Module 1 would not reach the Cape in February, as expected. This meant, the moon landing might be delayed because the lander was not ready. But the mission planners could not wait for the Apollo engineers to iron out all the problems. They had to plan for a landing in 1969 and hope that the hardware would catch up with them.
Lunar Module Diagram
John Disher Explains Apollo Components
Lunar Module Test Article LTA-2R