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He requested a return wire indicating the date of the delta Flight Readiness Review and evaluation of the readiness for astronaut LLTV flight. In a reply, several hours later, MSC informed Mueller that a delta FRR had been conducted that date; that the changes in avionics had been extensively ground-checked and demonstrated on two separate test flights on June 9 and June 12; that the MSC board concluded the overall system was ready for astronaut training; and that the plan was to start the Apollo 11 Critical Design Review on the following day.