With the seal plate and the sealant around it removed, the angle frame on the pressure bulkhead underneath was exposed — and it was corroded too.

Getting at it was most of the work. Seven stringers had to be cut, the vertical beams removed and the cable pulley assembly taken off before the angle frame could be pulled clear.

With the new angle frame in, the seven stringers were spliced back together and the beams and the pulley assembly refitted. Taking the angle frame out had in turn opened up the structure below it.