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 11. A limited number of landmark sightings, made by the onboard systems, will be used to reduce altitude uncertainties and effectively the the Manned Space Flight Network to the moon.

12. There are three types of areas in which a landing could be made:

1. A general area, possibly ten miles in length, in which any particular point could be an acceptable landing site.

2. A specific area determined by the guidance dispersion. This could be an area bout one and one-half miles in length.

3. A specific point which would require considerable maneuvering to reach.

The first landing mission will probably use the specific area type of site. This would result in a saving of fuel ( over the specific point site) which could be used for the hover and touchdown phase. The main point is that the capability exists to reach all three types of sites.

13. The crew will be used integrally throughout the mission, particu­larly in site selection and during the landing phase to avoid local obstacles and to provide visibility during touchdown. If increased knowledge indicates minimal dust problems from engine exhaust interaction and we can presume visibility through touch­ down, then same of the mechanization of the landing and touchdown operation can be simplified.

14. The first mission will have an 18 -hour surface stay and two joint excursions by the astronauts.

15. The concentric flight plan will be used for ascent from the lunar surface to rendezvous with the CSM. The LM Rendezvous Radar, the CSM optical system, and the MSFN tracking of both spacecraft will combine in the navigation and checking of the maneuvers.

16. The CSM has the inherent capability to rescue a LM from a low lunar orbit. Providing for this capability is one of the major contingency considerations for Service Module reaction control re­actants.

17. The mission is planned for a water landing with the prime recovery zone in the Pacific Ocean.

18. There is essentially continuous abort capability throughout the This includes LM descent up to and including touchdown. mission. There is also the ability to stage the LM after impact if the im­pact dynamics could cause the LM to tip over.