That the tacan aerial?
The QRA power recepticals, IIRC, were fastened with spring-loaded latches. I think the theory was the snap-shut action when the cable was snatched would cause the latch to snap and lock the door.
I think more often than not there was too much paint and gunge on the sprung hinges and on the latch and it didn't latch automatically. For a scramble we would go with the hatch sprung shut but not latched.