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Air carrier medium large transport could not retract gear because the gear door bypass valve was not fully closed.
| Attributes | |
| ACN | 175780 |
| Time | |
| Date | 199104 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ewr |
| State Reference | NJ |
| Altitude | agl bound lower : 0 agl bound upper : 6000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : sat |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : takeoff ground : preflight ground other : taxi |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 182 flight time total : 5000 flight time type : 713 |
| ASRS Report | 175780 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency none taken : unable |
| Consequence | other |
| Supplementary | |
| Primary Problem | Airport |
| Air Traffic Incident | Pilot Deviation |
Narrative:
After takeoff we discovered that we were unable to retract the landing gear. It remained in the down and locked position. We were unsuccessful in retracting the gear following the abnormal checklist. We were then vectored back for a normal approach and landing. On roll out, the left main gear door made contact with the runway. After stopping the aircraft maintenance personnel secured the gear door and we taxied back to the gate. On initial inspection maintenance found the gear bypass door/handle in a partially open position. On further inspection, they found the seal on the door/handle in a position that interfered with normal securing of the door/handle. Maintenance felt that during taxi and or takeoff roll the movement and vibrations caused the door/handle to become partially open. During preflight inspection I observed the door/handle being closed and locked. I feel this problem could have been avoided if there was an annunciator light in the cockpit.
Original NASA ASRS Text
Title: ACR MLG COULD NOT RETRACT GEAR BECAUSE THE GEAR DOOR BYPASS VALVE WAS NOT FULLY CLOSED.
Narrative: AFTER TKOF WE DISCOVERED THAT WE WERE UNABLE TO RETRACT THE LNDG GEAR. IT REMAINED IN THE DOWN AND LOCKED POS. WE WERE UNSUCCESSFUL IN RETRACTING THE GEAR FOLLOWING THE ABNORMAL CHKLIST. WE WERE THEN VECTORED BACK FOR A NORMAL APCH AND LNDG. ON ROLL OUT, THE L MAIN GEAR DOOR MADE CONTACT WITH THE RWY. AFTER STOPPING THE ACFT MAINT PERSONNEL SECURED THE GEAR DOOR AND WE TAXIED BACK TO THE GATE. ON INITIAL INSPECTION MAINT FOUND THE GEAR BYPASS DOOR/HANDLE IN A PARTIALLY OPEN POS. ON FURTHER INSPECTION, THEY FOUND THE SEAL ON THE DOOR/HANDLE IN A POS THAT INTERFERED WITH NORMAL SECURING OF THE DOOR/HANDLE. MAINT FELT THAT DURING TAXI AND OR TKOF ROLL THE MOVEMENT AND VIBRATIONS CAUSED THE DOOR/HANDLE TO BECOME PARTIALLY OPEN. DURING PREFLT INSPECTION I OBSERVED THE DOOR/HANDLE BEING CLOSED AND LOCKED. I FEEL THIS PROB COULD HAVE BEEN AVOIDED IF THERE WAS AN ANNUNCIATOR LIGHT IN THE COCKPIT.
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.