Emb-175 first officer reported failure to set parking brake at gate.

Attributes
ACN	1692524
Time
Date	201909
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	EMB ERJ 170/175 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Parked
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Events
Anomaly	Deviation - Procedural Published Material / Policy Ground Event / Encounter Loss Of Aircraft Control

Narrative:

Parking brake was not set. Rolled back 5 ft. Captain noticed we were rolling back and set the parking brake. We pulled up to the gate. I grabbed the checklist to start the shutdown checklist. I stated 'parking-brake' 3 times. With no reply. During the event I was focused on the checklist. I stated parking brake 3 times with no reaction from the captain. Rather than being focused on finishing the checklist I am much more aware of my surroundings. Keeping my head outside the cockpit until the parking brake comes on.

Original NASA ASRS Text

Title: EMB-175 First Officer reported failure to set parking brake at gate.

Narrative: Parking brake was not set. Rolled back 5 ft. Captain noticed we were rolling back and set the parking brake. We pulled up to the gate. I grabbed the checklist to start the shutdown checklist. I stated 'parking-brake' 3 times. With no reply. During the event I was focused on the checklist. I stated parking brake 3 times with no reaction from the Captain. Rather than being focused on finishing the checklist I am much more aware of my surroundings. Keeping my head outside the cockpit until the parking brake comes on.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.