The PFRF ( Pre Flight Readiness Firing ) tests conducted on 4A and 6A also would have caused exhaust gases to go up into the boattail, and thus they probably already had internal damage at launch.
2.
Although Thors were given a PFRF ( Pre Flight Readiness Firing ) prior to launch, these were between 5-15 seconds only as the launching facilities were not designed for a full duration firing as a static test stand was.
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