Just out of interest and a bit of thread drift but the aircraft pictured at the
Franklin Institute in Philadelphia was G-APFP which earlier in its life had suffered an engine turbine disc failure while being ground run at LHR around 1973, the incident and fire that burned through the wing and the subsequent repair is mentioned in a previous PPRuNe discussion about the G-ARWE accident
BA712 BOAC B707 Crash Heathrow 1968 post #33.
The repair to FP was extensive and afterwards Boeing presented BOAC with a nicely worded and framed certificate saying something like 'Presented to BOAC Engineering by the Boeing Company in recognition of the extremely Challenging and Technically Complex rebuild of the wing on B707-436 aircraft G-APFP' this was attached to the wall at the front of TBA near the Barclays Bank, I have always wondered where it went.