Air Carrier Pilot Crew reported the Captain failed to set the parking brake and the ground crew failed to insert chocks at gate arrival. The aircraft began to roll back before brakes were applied. No injuries or damage occurred.
Synopsis
Air Carrier Pilot Crew reported the Captain failed to set the parking brake and the ground crew failed to insert chocks at gate arrival. The aircraft began to roll back before brakes were applied. No injuries or damage occurred.
Narrative
CA (Captain) taxied to gate following the flight and stopped per marshaller guidance at the gate. Once marshaller gave the stop and chocks in signals; I took off my headset and began to read the shutdown checklist to the CA upon request. As we began the process we noticed the aircraft was rolling back from the gate and the CA applied the brakes to stop the aircraft before it moved more than a few feet. The ground crew plugged in the intercom and advised that they would be hooking up the tow bar and pulling the aircraft forward to the gate. Once the aircraft was pulled forward under tow; we completed the shutdown checklist to completion.CA attempted to set the parking brake unsuccessfully after being given the stop and chocks in signals; which were verified by Station Manager's review of video from the camera at that gate. Station Manager also stated that the aircraft started to move 16 seconds after stopping per the marshaller's signals.Ground crew failed to properly install nose gear chocks after aircraft taxied in. Station Manager stated that the chocks were set on the ground near the nose wheel; but slid out of the way as the aircraft began to roll back from the gate.Pilots need to ensure they check pressure on the brakes when the parking brake is set in the on position. Marshaller's need to ensure that the chocks are installed 'properly/completely' prior to giving pilots the chocks installed signal.
Second reporter narrative
While pulling into [the gate] at ZZZ with wing walkers and marshaller in place; I was given the chocks in place signal. I was distracted during my shutdown flow and didn't realize the parking brake had been missed. Once I sensed motion I looked up and the aircraft had started rolling back from the gate. Nothing was impacted and no injuries noted. The Ramp Manager came to the flight deck twice to discuss what had occurred after watching the ramp video. She stated that an elapsed time of 16 seconds passed before the aircraft started to roll back. She also commented that the ramp crew was new and that the chock under the nose wheel hadn't been placed in the correct position. The chocks for the Main Landing Gear hadn't been put in place either.Last day of a 4 - day with [early] van times on average and time change. Distraction on my part doing my shutdown flow. Ensure the parking brake and pressures are good when you get the chocks in signal.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.