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A B737-300 required an air turnback due to landing gear handle would not move to the 'up' position. Inspector and mechanic are notified that a diode was installed backwards on the landing gear handle solenoid.
| Attributes | |
| ACN | 778344 |
| Time | |
| Date | 200803 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Aircraft 1 | |
| Controlling Facilities | tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : inspector |
| Qualification | technician : inspection authority |
| ASRS Report | 778344 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| ASRS Report | 778051 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : work cards performance deficiency : installation performance deficiency : testing |
| Supplementary | |
| Problem Areas | Company Maintenance Human Performance Aircraft Chart Or Publication |
| Primary Problem | Chart Or Publication |
Narrative:
Today I was notified of an event that occurred with an air turn-back. The handle would not raise the gear and would not move to the 'up' position. After the aircraft was taken OTS; it was found that a diode was installed backwards on the landing gear handle solenoid. It was unknown to me that the diode could be installed backwards. It was relayed to me that this is a known problem; but as of now nothing has been done to address it. I entered a maintenance alert to bring a warning to the mechanic that it is possible to install it backwards. Supplemental information from acn 778051: removed and replaced landing gear solenoid. Maintenance manual and the figure on the paperwork does not show diode and does not say about installing the diode on a certain location. Perform operations check according to manual. No problem. Found inspection check job accomplish. Also it was discovered upon takeoff; landing gear handle will not come up and they did an air return. Came back to the gate and removed and replaced solenoid. Same problem. Gear handle will not come up. Reverse the diode and then it passed the test. Paperwork does not state or mention the diode at all.
Original NASA ASRS Text
Title: A B737-300 REQUIRED AN AIR TURNBACK DUE TO LANDING GEAR HANDLE WOULD NOT MOVE TO THE 'UP' POSITION. INSPECTOR AND MECHANIC ARE NOTIFIED THAT A DIODE WAS INSTALLED BACKWARDS ON THE LANDING GEAR HANDLE SOLENOID.
Narrative: TODAY I WAS NOTIFIED OF AN EVENT THAT OCCURRED WITH AN AIR TURN-BACK. THE HANDLE WOULD NOT RAISE THE GEAR AND WOULD NOT MOVE TO THE 'UP' POS. AFTER THE ACFT WAS TAKEN OTS; IT WAS FOUND THAT A DIODE WAS INSTALLED BACKWARDS ON THE LNDG GEAR HANDLE SOLENOID. IT WAS UNKNOWN TO ME THAT THE DIODE COULD BE INSTALLED BACKWARDS. IT WAS RELAYED TO ME THAT THIS IS A KNOWN PROB; BUT AS OF NOW NOTHING HAS BEEN DONE TO ADDRESS IT. I ENTERED A MAINT ALERT TO BRING A WARNING TO THE MECH THAT IT IS POSSIBLE TO INSTALL IT BACKWARDS. SUPPLEMENTAL INFO FROM ACN 778051: REMOVED AND REPLACED LNDG GEAR SOLENOID. MAINT MANUAL AND THE FIGURE ON THE PAPERWORK DOES NOT SHOW DIODE AND DOES NOT SAY ABOUT INSTALLING THE DIODE ON A CERTAIN LOCATION. PERFORM OPS CHK ACCORDING TO MANUAL. NO PROB. FOUND INSPECTION CHK JOB ACCOMPLISH. ALSO IT WAS DISCOVERED UPON TKOF; LNDG GEAR HANDLE WILL NOT COME UP AND THEY DID AN AIR RETURN. CAME BACK TO THE GATE AND REMOVED AND REPLACED SOLENOID. SAME PROB. GEAR HANDLE WILL NOT COME UP. REVERSE THE DIODE AND THEN IT PASSED THE TEST. PAPERWORK DOES NOT STATE OR MENTION THE DIODE AT ALL.
Data retrieved from NASA's ASRS site as of May 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.