 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Reinitiating pushback from the gate at dtw, ground crew breaks tow bar due to communication failure with flight crew to release brakes.
| Attributes | |
| ACN | 573529 |
| Time | |
| Date | 200302 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Snow |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : pushback |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 5500 flight time type : 715 |
| ASRS Report | 573529 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 211 |
| ASRS Report | 573683 |
| Events | |
| Anomaly | non adherence : published procedure non adherence : company policies other anomaly other |
| Independent Detector | other other : 3 |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | other |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Flight Crew Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
On pushback from the gate in dtw, we were asked to configure for deicing. After pushing back 10 ft, we set the brake, and I turned off the APU bleed valve and pack switches. The aircraft was deiced, and we were told that we would be pushing back the remaining distance. Since I did not have my flight interphone switch volume turned up (SOP), I did not hear the conversation between the captain and the tug driver. The next thing I felt was the aircraft moving back and then a large jolt. It felt like an impact somewhere on the fuselage. It was then I turned up my interphone volume and heard the mechanic tell the captain that the tow bar had broken. I then looked down and saw that the brake was still set. The mechanic told us that he was going to get a new towbar and the ensuing pushback was uneventful. Supplemental information from acn 573683: to the best of my recollection, the mechanic instructed us to set the brakes. 10 mins later, the mechanic told us we would be continuing the pushback. The first officer and I were reconfiguring after deicing when we felt a large lurch. The tug crew attempted to move the aircraft with the parking brake still set. Communication conflicts between the tug crew and us up in the cockpit included the fact that the tug driver was not talking with us -- it was a 2 person pushback. Also, while we did not hear the push crew ask for 'brakes off' prior to attempting to restart the push, we were busy re-establishing aircraft heat after deicing.
Original NASA ASRS Text
Title: REINITIATING PUSHBACK FROM THE GATE AT DTW, GND CREW BREAKS TOW BAR DUE TO COM FAILURE WITH FLT CREW TO RELEASE BRAKES.
Narrative: ON PUSHBACK FROM THE GATE IN DTW, WE WERE ASKED TO CONFIGURE FOR DEICING. AFTER PUSHING BACK 10 FT, WE SET THE BRAKE, AND I TURNED OFF THE APU BLEED VALVE AND PACK SWITCHES. THE ACFT WAS DEICED, AND WE WERE TOLD THAT WE WOULD BE PUSHING BACK THE REMAINING DISTANCE. SINCE I DID NOT HAVE MY FLT INTERPHONE SWITCH VOLUME TURNED UP (SOP), I DID NOT HEAR THE CONVERSATION BTWN THE CAPT AND THE TUG DRIVER. THE NEXT THING I FELT WAS THE ACFT MOVING BACK AND THEN A LARGE JOLT. IT FELT LIKE AN IMPACT SOMEWHERE ON THE FUSELAGE. IT WAS THEN I TURNED UP MY INTERPHONE VOLUME AND HEARD THE MECH TELL THE CAPT THAT THE TOW BAR HAD BROKEN. I THEN LOOKED DOWN AND SAW THAT THE BRAKE WAS STILL SET. THE MECH TOLD US THAT HE WAS GOING TO GET A NEW TOWBAR AND THE ENSUING PUSHBACK WAS UNEVENTFUL. SUPPLEMENTAL INFO FROM ACN 573683: TO THE BEST OF MY RECOLLECTION, THE MECH INSTRUCTED US TO SET THE BRAKES. 10 MINS LATER, THE MECH TOLD US WE WOULD BE CONTINUING THE PUSHBACK. THE FO AND I WERE RECONFIGURING AFTER DEICING WHEN WE FELT A LARGE LURCH. THE TUG CREW ATTEMPTED TO MOVE THE ACFT WITH THE PARKING BRAKE STILL SET. COM CONFLICTS BTWN THE TUG CREW AND US UP IN THE COCKPIT INCLUDED THE FACT THAT THE TUG DRIVER WAS NOT TALKING WITH US -- IT WAS A 2 PERSON PUSHBACK. ALSO, WHILE WE DID NOT HEAR THE PUSH CREW ASK FOR 'BRAKES OFF' PRIOR TO ATTEMPTING TO RESTART THE PUSH, WE WERE BUSY RE-ESTABLISHING ACFT HEAT AFTER DEICING.
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.