[time-nuts] MTBF (was Rubidium standard)

[SAIDJACK at aol.com]

Hi Bob,
 
I read this was done only on Block-1 systems. In Block-2 (the units that  
actually carried humans) they had all attitude thrusters, and the main engine 
 control done by the computer itself. No spares or backup control systems 
for the  thrusters!
 
No CM computer, no return to earth. I think this is also discussed in  the 
movie Apollo 13.
 
bye,
Said
 
 
In a message dated 11/18/2009 15:17:59 Pacific Standard Time,  
rdarlington at gmail.com writes:

Aside  from the spare in the LM, they had a backup computer called the  
abort
guidance system developed by TRW.  I think it was bolted up  under a  seat
somewhere.

-Bob