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Ramp operation of baggage loading in jeopardy when the parking brakes on a B777 were released for pushback then not reset at the gate when pushback canceled by tug driver in sfo, ca.
| Attributes | |
| ACN | 581598 |
| Time | |
| Date | 200305 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sfo.airport |
| State Reference | CA |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked ground : pushback |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 581598 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : ground less severe other anomaly other anomaly other |
| Independent Detector | other other : gnd 3 vd |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Problem Areas | Company Flight Crew Human Performance Maintenance Human Performance |
| Primary Problem | Company |
Narrative:
At departure time and doors just closed. Tug driver called to release brakes. Captain released brakes and told first officer to get pushback clearance. Just then, tug driver called to say ramp had more bags to load. Captain acknowledged call and told first officer to cancel pushback with ground. A few mins later, tug driver came back on and asked what had changed. Captain responded 'nothing, why?' tug driver said aircraft had rolled back about 5 ft after he left tug. He asked if brakes were set. Captain said they were off and had been off since initial call for release. Tug driver then said he had asked for brakes to be reset when additional bags were to be loaded, but hadn't waited for acknowledgement. No one was injured, no equipment was damaged, but it was a case where there was a lack of communications. Tug driver had assumed brakes were set (even though no acknowledgement or light on) and captain assumed tug driver still had control of aircraft.
Original NASA ASRS Text
Title: RAMP OP OF BAGGAGE LOADING IN JEOPARDY WHEN THE PARKING BRAKES ON A B777 WERE RELEASED FOR PUSHBACK THEN NOT RESET AT THE GATE WHEN PUSHBACK CANCELED BY TUG DRIVER IN SFO, CA.
Narrative: AT DEP TIME AND DOORS JUST CLOSED. TUG DRIVER CALLED TO RELEASE BRAKES. CAPT RELEASED BRAKES AND TOLD FO TO GET PUSHBACK CLRNC. JUST THEN, TUG DRIVER CALLED TO SAY RAMP HAD MORE BAGS TO LOAD. CAPT ACKNOWLEDGED CALL AND TOLD FO TO CANCEL PUSHBACK WITH GND. A FEW MINS LATER, TUG DRIVER CAME BACK ON AND ASKED WHAT HAD CHANGED. CAPT RESPONDED 'NOTHING, WHY?' TUG DRIVER SAID ACFT HAD ROLLED BACK ABOUT 5 FT AFTER HE LEFT TUG. HE ASKED IF BRAKES WERE SET. CAPT SAID THEY WERE OFF AND HAD BEEN OFF SINCE INITIAL CALL FOR RELEASE. TUG DRIVER THEN SAID HE HAD ASKED FOR BRAKES TO BE RESET WHEN ADDITIONAL BAGS WERE TO BE LOADED, BUT HADN'T WAITED FOR ACKNOWLEDGEMENT. NO ONE WAS INJURED, NO EQUIP WAS DAMAGED, BUT IT WAS A CASE WHERE THERE WAS A LACK OF COMS. TUG DRIVER HAD ASSUMED BRAKES WERE SET (EVEN THOUGH NO ACKNOWLEDGEMENT OR LIGHT ON) AND CAPT ASSUMED TUG DRIVER STILL HAD CTL OF ACFT.
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.