The preliminary occurrence report into the Qantas 747 (VH-OJK) that suffered an explosive depressurisation 475 km northwest of Manila has been released by the Australian Transport Safety Bureau (ATSB) and with it, more images of the oxygen cylinders that allegedly caused the incident.
From the ATSB report:
“After clearing the baggage and cargo from the forward aircraft hold, it was evident that one passenger oxygen cylinder (number-4 from a bank of seven cylinders along the right side of the cargo hold) had sustained a sudden failure and forceful discharge of its pressurised contents into the aircraft hold, rupturing the fuselage in the vicinity of the wing-fuselage leading edge fairing. The cylinder had been propelled upward by the force of the discharge, puncturing the cabin floor and entering the cabin adjacent to the second main cabin door. The cylinder had subsequently impacted the door frame, door handle and overhead panelling, before falling to the cabin floor and exiting the aircraft through the ruptured fuselage.“
Following is a video of a rapid descent flown by 777 Emirates crew from one of their excellent internal training videos. The nature of the QF’s incident was different since the decompression was explosive – meaning that more consideration needed to be made to the structural integrity of the airframe and the airspeed flown in the descent. Note that the crew did in the video do not action the first two recall items from the Boeing 747 checklist, which is to don oxygen masks and establish crew communication. This was likely omitted for video production purposes.