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An ATR72 engine is started without propeller movement (in 'hotel' mode). The aircraft moves forward and hits a gpu. PIC is unable to stop aircraft on the ramp at ewr, nj.
| Attributes | |
| ACN | 459673 |
| Time | |
| Date | 200001 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ewr.airport |
| State Reference | NJ |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : cvg.tower |
| Operator | common carrier : air carrier |
| Make Model Name | ATR 72 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 4100 flight time type : 2000 |
| ASRS Report | 459673 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical conflict : ground critical ground encounters : vehicle non adherence : company policies other anomaly other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | other other other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Maintenance Human Performance Aircraft Airport Company |
| Primary Problem | Maintenance Human Performance |
Narrative:
Our ATR72 rolled forward and hit a gpu. My first officer and I had been in the cockpit for 40 mins doing our normal duties for our first flight of the day. Engine N2 was started in hotel mode (propeller not turning). Suddenly the airplane started to move forward. I immediately applied the brakes and recycled the parking/emergency brake. The airplane did not stop. We hit a gpu nearby. We had not told the ramp personnel to unchock us. Furthermore, a tow bar was hooked up to the nosewheel. It is SOP to keep aircraft chocked until tug is in place. Another contributing factor: failure of the brake accumulator to provide adequate pressure. Finally, constructions going on on our ramp forced company to change parking spots/procedure many times in the past few weeks.
Original NASA ASRS Text
Title: AN ATR72 ENG IS STARTED WITHOUT PROP MOVEMENT (IN 'HOTEL' MODE). THE ACFT MOVES FORWARD AND HITS A GPU. PIC IS UNABLE TO STOP ACFT ON THE RAMP AT EWR, NJ.
Narrative: OUR ATR72 ROLLED FORWARD AND HIT A GPU. MY FO AND I HAD BEEN IN THE COCKPIT FOR 40 MINS DOING OUR NORMAL DUTIES FOR OUR FIRST FLT OF THE DAY. ENG N2 WAS STARTED IN HOTEL MODE (PROP NOT TURNING). SUDDENLY THE AIRPLANE STARTED TO MOVE FORWARD. I IMMEDIATELY APPLIED THE BRAKES AND RECYCLED THE PARKING/EMER BRAKE. THE AIRPLANE DID NOT STOP. WE HIT A GPU NEARBY. WE HAD NOT TOLD THE RAMP PERSONNEL TO UNCHOCK US. FURTHERMORE, A TOW BAR WAS HOOKED UP TO THE NOSEWHEEL. IT IS SOP TO KEEP ACFT CHOCKED UNTIL TUG IS IN PLACE. ANOTHER CONTRIBUTING FACTOR: FAILURE OF THE BRAKE ACCUMULATOR TO PROVIDE ADEQUATE PRESSURE. FINALLY, CONSTRUCTIONS GOING ON ON OUR RAMP FORCED COMPANY TO CHANGE PARKING SPOTS/PROC MANY TIMES IN THE PAST FEW WKS.
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.