DC-9 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Troubleshooting; Workload; Time Pressure; Distraction
Aircraft Equipment Problem Less Severe
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Departure Airport
Aircraft
On climb out lost pressurization. Master Warning for cabin altitude illuminated. Performed emergency procedure and notified ATC and began a descent. Descended to 10;000 ft MSL. Received clearance back to [the departure airport]. Upon inspection it was found that cargo floor retaining ring had failed allowing pallet jack to roll back and hit rear bulkhead. The bulkhead appeared to be damaged and be the cause of pressurization loss.
[Report narrative contained no additional information.]
DC-9 flight crew reported a loss of cabin pressure during climb out due to a pallet jack becoming unsecured and puncturing the bulkhead.