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An ATR72 was being pushed out of the hanger and the technician riding brakes was alerted. The towbar dropped off the nose gear. Applied brakes; no damage.
| Attributes | |
| ACN | 718153 |
| Time | |
| Date | 200611 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 718153 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | other personnel |
| Events | |
| Anomaly | ground encounters other maintenance problem : improper maintenance non adherence : published procedure non adherence : far other anomaly other |
| Independent Detector | other other : 3 |
| Resolutory Action | other |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Company Maintenance Human Performance Chart Or Publication |
| Primary Problem | Company |
| Situations | |
| Publication | Ground Equip Maint |
Narrative:
While towing an ATR out of the hangar with the help of the lead technician following all safety and manuals procedures; the company provided towbar came off from the nose landing gear attachment and the aircraft rolled back by itself. Noting the situation I applied the emergency brakes and the aircraft stopped without any incident or accident. Cause: the probable cause; could be the spring that holds the 2 forks in place is fatigue and didn't hold the 2 forks locked with the nose gear attachment. Follow emergency procedures; the aircraft emergency brakes were applied and the aircraft stopped. It would be smart to verify that the towbars provided by the company are the correct ones as per ATR; and provide a routine check and lubrication on so critical equipment. Verify if this type of equipment is inspected periodically for serviceability by other than the mechanics.
Original NASA ASRS Text
Title: AN ATR72 WAS BEING PUSHED OUT OF THE HANGER AND THE TECHNICIAN RIDING BRAKES WAS ALERTED. THE TOWBAR DROPPED OFF THE NOSE GEAR. APPLIED BRAKES; NO DAMAGE.
Narrative: WHILE TOWING AN ATR OUT OF THE HANGAR WITH THE HELP OF THE LEAD TECHNICIAN FOLLOWING ALL SAFETY AND MANUALS PROCS; THE COMPANY PROVIDED TOWBAR CAME OFF FROM THE NOSE LNDG GEAR ATTACHMENT AND THE ACFT ROLLED BACK BY ITSELF. NOTING THE SITUATION I APPLIED THE EMER BRAKES AND THE ACFT STOPPED WITHOUT ANY INCIDENT OR ACCIDENT. CAUSE: THE PROBABLE CAUSE; COULD BE THE SPRING THAT HOLDS THE 2 FORKS IN PLACE IS FATIGUE AND DIDN'T HOLD THE 2 FORKS LOCKED WITH THE NOSE GEAR ATTACHMENT. FOLLOW EMER PROCS; THE ACFT EMER BRAKES WERE APPLIED AND THE ACFT STOPPED. IT WOULD BE SMART TO VERIFY THAT THE TOWBARS PROVIDED BY THE COMPANY ARE THE CORRECT ONES AS PER ATR; AND PROVIDE A ROUTINE CHK AND LUBRICATION ON SO CRITICAL EQUIP. VERIFY IF THIS TYPE OF EQUIP IS INSPECTED PERIODICALLY FOR SERVICEABILITY BY OTHER THAN THE MECHS.
Data retrieved from NASA's ASRS site as of January 2009 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.