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A DC10-30 on initial climb at 500 ft declared an emergency and diverted due to center landing gear unsafe indication. Caused by a failed retract cylinder.
| Attributes | |
| ACN | 653724 |
| Time | |
| Date | 200504 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : zzz.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | MD-10 Conversion |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 150 flight time total : 10000 flight time type : 1500 |
| ASRS Report | 653724 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : landing gear position ind other flight crewa other flight crewb |
| Resolutory Action | controller : provided flight assist flight crew : declared emergency flight crew : overcame equipment problem flight crew : diverted to another airport |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
On takeoff from ZZZ; raised the gear; first officer noticed a red light in the center gear. We confirmed the unsafe gear indication with our secondary instruments. Immediately advised approach control that we had a center gear unsafe indication; requested a leveloff at 5000 ft; and kept our speed down to 210 KTS. We requested vectors back to runway 36C at ZZZ. In accordance with our checklist; we put the gear handle down and still continued to have an unsafe gear indication. Declared an emergency; requested permission to dump fuel. Asked approach to vector us around south of the field while we accomplished numerous abnormal checklists concerning our unsafe gear. Coordinated with approach to relay to tower that we would be stopping straight ahead on the runway and 'maintenance' pin our gears and tow us back into the gate. On short final; had tower look us over and confirm center gear was up. An uneventful landing accomplished. Maintenance later confirmed a hydraulic center strut leak caused the center gear to be stuck in a partially down position. Callback conversation with reporter revealed the following information: after landing; maintenance discovered the end cap on the center main gear retract cylinder had failed with the landing gear partially retracted to about 45 degrees.
Original NASA ASRS Text
Title: A DC10-30 ON INITIAL CLB AT 500 FT DECLARED AN EMER AND DIVERTED DUE TO CTR LNDG GEAR UNSAFE INDICATION. CAUSED BY A FAILED RETRACT CYLINDER.
Narrative: ON TKOF FROM ZZZ; RAISED THE GEAR; FO NOTICED A RED LIGHT IN THE CTR GEAR. WE CONFIRMED THE UNSAFE GEAR INDICATION WITH OUR SECONDARY INSTS. IMMEDIATELY ADVISED APCH CTL THAT WE HAD A CTR GEAR UNSAFE INDICATION; REQUESTED A LEVELOFF AT 5000 FT; AND KEPT OUR SPD DOWN TO 210 KTS. WE REQUESTED VECTORS BACK TO RWY 36C AT ZZZ. IN ACCORDANCE WITH OUR CHKLIST; WE PUT THE GEAR HANDLE DOWN AND STILL CONTINUED TO HAVE AN UNSAFE GEAR INDICATION. DECLARED AN EMER; REQUESTED PERMISSION TO DUMP FUEL. ASKED APCH TO VECTOR US AROUND S OF THE FIELD WHILE WE ACCOMPLISHED NUMEROUS ABNORMAL CHKLISTS CONCERNING OUR UNSAFE GEAR. COORDINATED WITH APCH TO RELAY TO TWR THAT WE WOULD BE STOPPING STRAIGHT AHEAD ON THE RWY AND 'MAINT' PIN OUR GEARS AND TOW US BACK INTO THE GATE. ON SHORT FINAL; HAD TWR LOOK US OVER AND CONFIRM CTR GEAR WAS UP. AN UNEVENTFUL LNDG ACCOMPLISHED. MAINT LATER CONFIRMED A HYD CTR STRUT LEAK CAUSED THE CTR GEAR TO BE STUCK IN A PARTIALLY DOWN POS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: AFTER LNDG; MAINT DISCOVERED THE END CAP ON THE CTR MAIN GEAR RETRACT CYLINDER HAD FAILED WITH THE LNDG GEAR PARTIALLY RETRACTED TO ABOUT 45 DEGS.
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.