Manchester. Let me throw this one in. The wind on the fire side of the aircraft was a big factor but what I found odd about the enquiry was no mention of the Reverser Buckets on the JT8s. The bucket hinges on the
original aircraft were horizontal. Boeing then moved them 45 degrees to stop forward blown FOD; with both the upper buckets directed at the fuselage. Without the ‘new’ buckets, or buckets swung the other way, the aircraft fuselage would, I believe, have taken much longer to burn through. They acted like a runaway blowtorch. Notice the muck from normal reverser use, below. Precisely where Manchester first burnt through.
Correction. Wrong on the buckets not being mentioned. Point still stays.
