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The basic problem with the 707 is that it has the wrong autopilot.  :( The 707 should have a Bendix PB20 but C.S. put in the Sperry from the 727

The Boeing 707 has used BOTH types of the AP.


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along with most the cockpit bitmaps to save themselves the extra cost and effort to get it right.

Not most but some, because the 707 and 727 flight deck frame and equipment are identical or very similar in some aspects.