remember kids that's why you dont put b-52 and g force in the same sentence, with exception being this sentence
This is what you call becoming a "Test Pilot", the AC is practicing for an airshow, and wants to impress, and he certainly does, this literally makes me feel ill, but is illustrative of the type of "hot rocks" flying that used to cause my Dad to fume and cuss, and he didn't cuss. You will note that at approx 150 degrees or so of the planned 360, he begins to lighten up the bank angle and recovers the aircraft from an initial overbanking tendency, you "must" apply opposite aileron in this steep of a bank. Rather than level the wings and recover the aircraft, the AC re-enters the 360, you will note that he has increased thrust to the maximum shortly after stabilising the initial turn in to the bank, by about the 200 degree point the AC is losing control of the aircraft due to an aerodynamic "STALL". You will note that the airplane slides off on the inboard wing into the ground and literally disentigrates as it contact "terra firma".
While the aircraft is operating outside of the envelope, and definetly pulling 3-4 gs, there is no separtion of any airframe pieces until ground contact is made, the aircraft stalls before any separation can occur, and that is by design. While B-52s are typically operated at low altitude in a "penetration", it is principally a high altitude heavy bomber. Boeings are very strong aircraft, and the wing and stabilizer attach points are "overbuilt", to illustrate my point, I would remind readers that the B-47 would penetrate the target area at a high rate of speed and low altitude, as the aircraft approached the target, the pilot would pull to the vertical just like some of the insane airshow moves we see, as the aircraft pitched to the vertical the bombadier would release the nuke, the pilot would then pull through the vertical at the top of the manuever and execute an Immelman turn, and decend at a high rate of speed back to the deck to exit the area, hopefully before that Nuke went off.
Now, this wasn't an easy manuever, and it did in fact overstress the airframe, it did not last long as I believe they may have noticed some cracking etc, but this is all from memory. Air China 006 did in fact suffer airframe separation from sever over G and by God's grace, they all lived to tell the tale, losing the outboard sections of both horizonatal stabs and elevators in the process, along with sundry damage and the wings taking a permanent 2 degree upward set, which was still within tolerances, this friends in a 747 that performs a full roll, due to loss of control of the aircraft by the AC. END OFF TOPIC