B767 Flight Crew reported inflight failure of cargo door latch during climb. Flight crew diverted which led to an overweight landing and a primary hydraulic system warning.
Synopsis
B767 Flight Crew reported inflight failure of cargo door latch during climb. Flight crew diverted which led to an overweight landing and a primary hydraulic system warning.
Narrative
I was the CA Pilot Flying; on climb out while leaving FL230 for FL320 the Load Master we had onboard got up to use the lavatory. He noticed the green handle that locks and arms the L1 door was not in the locked position and notified me. I transferred the controls to my FO and went to check on the handle. I pushed the button and locked the handle in the Armed position. After the green handle was locked the main L1 door handle started to slowly come up and the door itself was cracking open and wanting to slid up. I grabbed the handle and held it closed. I tried to release the handle to see if it was going to stay closed and it was not staying closed without someone holding pressure against the handle. I asked the Load Master to hold the handle down while I got back to my seat and start the divert to the nearest suitable airport and descending to get pressure off the door. We started a turn back to ZZZ1 but the weather was too low and we were limited to CAT I approaches per maintenance placard in the aircraft. We talked to Dispatch and determined that ZZZ was our best option and weather conditions for diverting. We were going to be landing over weight in ZZZ by 18000 pounds. At 8000 Feet AGL my First Officer went to the back and helped secure the door handle to not open up so the Load Master could get back to his seat and strap in for approach and landing. Once everyone was secure back in their seats we started the vector for arrival into ZZZ. We vectored to burn off a little more fuel before coming in for the approach. Upon landing we received a L/R Primary Hydraulic light and EICAS message and a L REV ISLN VALVE STATUS Message. We taxied to park; when I went to secure the aircraft from the outside I lowered the L1 door and pushed the lever in to close and lock the door but [it] would never fully close or lay flush against the fuselage.
Second reporter narrative
I was the First Officer monitoring. When climbing through FL230 for FL320 the loadmaster got up to use the restroom and noticed the door latch was unarmed. He alerted the Captain and the Captain got up to check on it. The Captain then rearmed the door; however the latch would not stay down and kept wanting to pull up when he removed his hand. The load master then held the latch down while captain returned to his seat. We then [requested priority handling] and diverted to ZZZ. Once we reached a safe altitude I got up and helped the load master secure the door by wedging a trash bag into the handle to allow all persons to return to their seat and buckle in for the remainder of the flight. We preformed an over weight landing. We were 18;000 pounds overweight. When we landed we got both left and right hydraulic pump primary EICAS and lights along with a left reverser isolation valve status message. Finally after securing the aircraft the Captain was unable to get the door to fully latch from the outside.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.