Large transport air carrier aircraft rolled into jetway after parking due to a loss of sufficient hydraulic pressure to hold the aircraft by the parking brake.

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Attributes
ACN	245662
Time
Date	199307
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : jfk
State Reference	NY
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 17000
ASRS Report	245662
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : atp
Events
Anomaly	aircraft equipment problem : less severe conflict : ground critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Aircraft stopped at gate and parking brake set. Lights on, brake pressure ok (3100 pounds). Started the after parking SOP's when I felt a bump. At that time I noticed the aircraft had rolled forward and the left engine had struck the jetway. Checked parking brake. The lights still indicated the parking brake was set, however, the brake pressure gauge now indicated 1000 psi. Turned electrical hydraulic pumps back on and pressure returned to normal. The main factor that contributed to this incident is the ramp lighting in the air carrier a, air carrier B terminal ramp area. The lights are so bright and are aimed so that they flood the cockpit with bright light. This, along with the light to moderate rain on the cockpit windows, diffused the view out of the cockpit to such an extent that slow movement of the aircraft was undetectable. The color of the building also blended in with the general color further hindering detection of movement.

Original NASA ASRS Text

Title: LGT ACR ACFT ROLLED INTO JETWAY AFTER PARKING DUE TO A LOSS OF SUFFICIENT HYD PRESSURE TO HOLD THE ACFT BY THE PARKING BRAKE.

Narrative: ACFT STOPPED AT GATE AND PARKING BRAKE SET. LIGHTS ON, BRAKE PRESSURE OK (3100 LBS). STARTED THE AFTER PARKING SOP'S WHEN I FELT A BUMP. AT THAT TIME I NOTICED THE ACFT HAD ROLLED FORWARD AND THE L ENG HAD STRUCK THE JETWAY. CHKED PARKING BRAKE. THE LIGHTS STILL INDICATED THE PARKING BRAKE WAS SET, HOWEVER, THE BRAKE PRESSURE GAUGE NOW INDICATED 1000 PSI. TURNED ELECTRICAL HYD PUMPS BACK ON AND PRESSURE RETURNED TO NORMAL. THE MAIN FACTOR THAT CONTRIBUTED TO THIS INCIDENT IS THE RAMP LIGHTING IN THE ACR A, ACR B TERMINAL RAMP AREA. THE LIGHTS ARE SO BRIGHT AND ARE AIMED SO THAT THEY FLOOD THE COCKPIT WITH BRIGHT LIGHT. THIS, ALONG WITH THE LIGHT TO MODERATE RAIN ON THE COCKPIT WINDOWS, DIFFUSED THE VIEW OUT OF THE COCKPIT TO SUCH AN EXTENT THAT SLOW MOVEMENT OF THE ACFT WAS UNDETECTABLE. THE COLOR OF THE BUILDING ALSO BLENDED IN WITH THE GENERAL COLOR FURTHER HINDERING DETECTION OF MOVEMENT.

Data retrieved from NASA's ASRS site as of July 2007 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.