<< >> NASA ASRS Report 700712, June 2006

After pushback A320 flight crew sets brake per ground personnel request; aircraft rolls and brake pressure is at zero. No injuries.

Attributes
ACN	700712
Time
Date	200606
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : tpa.airport
State Reference	FL
Altitude	agl single value : 0
Environment
Weather Elements	other
Aircraft 1
Controlling Facilities	tower : dfw.tower
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	ground : pushback
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 240 flight time total : 8000 flight time type : 1800
ASRS Report	700712
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 200 flight time total : 6800 flight time type : 2400
ASRS Report	700715
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other other : 3
Resolutory Action	flight crew : regained aircraft control
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance

Narrative:

After pushback park brake was set per pushback crew request. After briefly looking away; I noticed brake pressure indicating zero. Immediately I stepped on the brakes while looking at the handle and seeing that it was in the 'parking brake on' position. At the same time that I was depressing the pedal brakes I heard the ground crew say repeatedly to set the brakes. The aircraft came to a sudden stop as I released the parking brake handle to 'off' while holding the pedal brakes. There were no injuries nor damage to ground equipment. The aircraft had began to roll prior to salute and release. Supplemental information from acn 700715: we cycled the brake a few times with the system in normal and using the yellow system and all the system where working ok. The flight continued with no other problems.

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Original NASA ASRS Text

Title: AFTER PUSHBACK A320 FLT CREW SETS BRAKE PER GND PERSONNEL REQUEST; ACFT ROLLS AND BRAKE PRESSURE IS AT ZERO. NO INJURIES.

Narrative: AFTER PUSHBACK PARK BRAKE WAS SET PER PUSHBACK CREW REQUEST. AFTER BRIEFLY LOOKING AWAY; I NOTICED BRAKE PRESSURE INDICATING ZERO. IMMEDIATELY I STEPPED ON THE BRAKES WHILE LOOKING AT THE HANDLE AND SEEING THAT IT WAS IN THE 'PARKING BRAKE ON' POS. AT THE SAME TIME THAT I WAS DEPRESSING THE PEDAL BRAKES I HEARD THE GND CREW SAY REPEATEDLY TO SET THE BRAKES. THE ACFT CAME TO A SUDDEN STOP AS I RELEASED THE PARKING BRAKE HANDLE TO 'OFF' WHILE HOLDING THE PEDAL BRAKES. THERE WERE NO INJURIES NOR DAMAGE TO GND EQUIP. THE ACFT HAD BEGAN TO ROLL PRIOR TO SALUTE AND RELEASE. SUPPLEMENTAL INFO FROM ACN 700715: WE CYCLED THE BRAKE A FEW TIMES WITH THE SYS IN NORMAL AND USING THE YELLOW SYS AND ALL THE SYS WHERE WORKING OK. THE FLT CONTINUED WITH NO OTHER PROBS.

Data retrieved from NASA's ASRS site as of January 2009 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.