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An MD80 on climb out at 3000 ft diverted due to unable to retract the nose gear. On landing found nose gear hydraulic bypass valve open.
| Attributes | |
| ACN | 634426 |
| Time | |
| Date | 200410 |
| Day | Tue |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | Rain |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 634426 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 634425 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far non adherence : company policies |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : diverted to another airport |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : weather contributing factor : lighting performance deficiency : scheduled maintenance performance deficiency : non compliance with legal requirements performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft Maintenance Human Performance Weather Environmental Factor |
| Primary Problem | Maintenance Human Performance |
Narrative:
After takeoff in ZZZ, the gear would not retract. It became apparent after examining checklists and talking to maintenance control that the gear was going to remain down. We returned for a normal landing in ZZZ with all indications normal. When a mechanic checked the gear, he informed us that the gear bypass was open. Assuming the gear bypass was left open by someone, it is possible it was left open by maintenance during their service check the night before. Since it was dark and rainy for this early morning departure, it may have been missed during walkarounds.
Original NASA ASRS Text
Title: AN MD80 ON CLBOUT AT 3000 FT DIVERTED DUE TO UNABLE TO RETRACT THE NOSE GEAR. ON LNDG FOUND NOSE GEAR HYD BYPASS VALVE OPEN.
Narrative: AFTER TKOF IN ZZZ, THE GEAR WOULD NOT RETRACT. IT BECAME APPARENT AFTER EXAMINING CHKLISTS AND TALKING TO MAINT CTL THAT THE GEAR WAS GOING TO REMAIN DOWN. WE RETURNED FOR A NORMAL LNDG IN ZZZ WITH ALL INDICATIONS NORMAL. WHEN A MECH CHKED THE GEAR, HE INFORMED US THAT THE GEAR BYPASS WAS OPEN. ASSUMING THE GEAR BYPASS WAS LEFT OPEN BY SOMEONE, IT IS POSSIBLE IT WAS LEFT OPEN BY MAINT DURING THEIR SVC CHK THE NIGHT BEFORE. SINCE IT WAS DARK AND RAINY FOR THIS EARLY MORNING DEP, IT MAY HAVE BEEN MISSED DURING WALKAROUNDS.
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.