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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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A B737-500 after being towed off a parking spot and starting the left engine for taxi the tow bar was sheared and the aircraft tow fitting was damaged. Technician failed to switch off the left engine driven hydraulic pump.
| Attributes | |
| ACN | 694876 |
| Time | |
| Date | 200604 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground other : towing |
| Person 1 | |
| Affiliation | company : air carrier |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 694876 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | non adherence : published procedure |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Environmental Factor Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
Narrative:
I was relocating air carrier X from the pad to the gate. I was in the left seat and another technician was in the right seat; we were being towed off the pad and preparing to taxi after engine start. I red through my checklist quickly and missed turning my ('a' hydraulic engine driven pump) off. The tow bar sheared and damaged the tow fitting on the aircraft. I right&right'ed the tow fitting on the nose landing gear and inspected for further damage; none found and returned the aircraft to service.
Original NASA ASRS Text
Title: A B737-500 AFTER BEING TOWED OFF A PARKING SPOT AND STARTING THE L ENG FOR TAXI THE TOW BAR WAS SHEARED AND THE ACFT TOW FITTING WAS DAMAGED. TECHNICIAN FAILED TO SWITCH OFF THE L ENG DRIVEN HYD PUMP.
Narrative: I WAS RELOCATING ACR X FROM THE PAD TO THE GATE. I WAS IN THE L SEAT AND ANOTHER TECHNICIAN WAS IN THE R SEAT; WE WERE BEING TOWED OFF THE PAD AND PREPARING TO TAXI AFTER ENG START. I RED THROUGH MY CHKLIST QUICKLY AND MISSED TURNING MY ('A' HYD ENG DRIVEN PUMP) OFF. THE TOW BAR SHEARED AND DAMAGED THE TOW FITTING ON THE ACFT. I R&R'ED THE TOW FITTING ON THE NOSE LNDG GEAR AND INSPECTED FOR FURTHER DAMAGE; NONE FOUND AND RETURNED THE ACFT TO SVC.
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.