A B737 captain and the ground person detailed to install the nose wheel chocks after gate arrival; d...

Attributes
ACN	1185226
Time
Date	201407
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Component
Aircraft Component	Normal Brake System
Person 1
Function	Captain Pilot Flying
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 20000 Flight Crew Type 3300
Person 2
Function	Ramp
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Ground Event / Encounter Other / Unknown

Narrative:

Upon arrival our gate was occupied and we were instructed to hold. While stopping the aircraft it was noted that the brakes were very grabby as I brought the airplane to a complete stop. After being assigned a new gate we taxied to the new location and waited for the marshalling crew to arrive. Again the brakes grabbed several times as the airplane stopped. As we arrived at our final spot and the marshallers gave me the stop sign I was still a little concerned about the grabbiness of the brakes; so after initially setting the parking brake I released it and held them manually and started to let off a bit. I felt the aircraft move a bit and immediately reapplied the brake. At this time; however; the rampers were putting the chocks in and the aircraft rolled a bit. I talked to the ramp supervisor and the vulnerability of the ramper if the aircraft moves while they are near the wheels was discussed. I realize I should have waited until the chocks were signaled in to do any testing of the brakes and will be much more mindful of the safety issue involved in the future.

Original NASA ASRS Text

Title: A B737 Captain and the ground person detailed to install the nose wheel chocks after gate arrival; describe an uncommanded brake release causing the aircraft to roll and the person placing the chocks to jump clear.

Narrative: Upon arrival our gate was occupied and we were instructed to hold. While stopping the aircraft it was noted that the brakes were very grabby as I brought the airplane to a complete stop. After being assigned a new gate we taxied to the new location and waited for the marshalling crew to arrive. Again the brakes grabbed several times as the airplane stopped. As we arrived at our final spot and the marshallers gave me the stop sign I was still a little concerned about the grabbiness of the brakes; so after initially setting the parking brake I released it and held them manually and started to let off a bit. I felt the aircraft move a bit and immediately reapplied the brake. At this time; however; the rampers were putting the chocks in and the aircraft rolled a bit. I talked to the ramp supervisor and the vulnerability of the ramper if the aircraft moves while they are near the wheels was discussed. I realize I should have waited until the chocks were signaled in to do any testing of the brakes and will be much more mindful of the safety issue involved in the future.

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.

A B737 captain and the ground person detailed to install the nose wheel chocks after gate arrival; describe an uncommanded brake release causing the aircraft to roll and the person placing the chocks to jump clear.