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Flight crew of a B737 allowed the aircraft to roll over the tow bar after the company ground personnel mechanic disconnected the tow bar causing damage to the nosewheel strut. The captain inadvertently forgot to set the parking brake before starting the engines.
| Attributes | |
| ACN | 338512 |
| Time | |
| Date | 199606 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : yvr |
| State Reference | BC |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 4000 |
| ASRS Report | 338512 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : published procedure other anomaly other |
| Independent Detector | other other : unspecified |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
Just after scheduled pushback time, the captain determined we would use visual signals for pushback rather than the normal intercom system. The mechanic's headset was broken. Everything was normal until pushback stopped. In the confusion of visual signals the tow bar was disconnected and the parking brake was not set. As first officer and I were 'inside' starting engines, and detected no aircraft movement, but movement did occur. The jet's nosewheel straddled the tow bar and busted off a hydraulic servicing bolt and a subsequent nosewheel strut leak occurred. Contributing factors: normal pushback procedures not used due to broken headset. Unclr nonstandard visual signals confused the captain.
Original NASA ASRS Text
Title: FLC OF A B737 ALLOWED THE ACFT TO ROLL OVER THE TOW BAR AFTER THE CGP MECH DISCONNECTED THE TOW BAR CAUSING DAMAGE TO THE NOSEWHEEL STRUT. THE CAPT INADVERTENTLY FORGOT TO SET THE PARKING BRAKE BEFORE STARTING THE ENGS.
Narrative: JUST AFTER SCHEDULED PUSHBACK TIME, THE CAPT DETERMINED WE WOULD USE VISUAL SIGNALS FOR PUSHBACK RATHER THAN THE NORMAL INTERCOM SYS. THE MECH'S HEADSET WAS BROKEN. EVERYTHING WAS NORMAL UNTIL PUSHBACK STOPPED. IN THE CONFUSION OF VISUAL SIGNALS THE TOW BAR WAS DISCONNECTED AND THE PARKING BRAKE WAS NOT SET. AS FO AND I WERE 'INSIDE' STARTING ENGS, AND DETECTED NO ACFT MOVEMENT, BUT MOVEMENT DID OCCUR. THE JET'S NOSEWHEEL STRADDLED THE TOW BAR AND BUSTED OFF A HYD SVCING BOLT AND A SUBSEQUENT NOSEWHEEL STRUT LEAK OCCURRED. CONTRIBUTING FACTORS: NORMAL PUSHBACK PROCS NOT USED DUE TO BROKEN HEADSET. UNCLR NONSTANDARD VISUAL SIGNALS CONFUSED THE CAPT.
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.