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A DC9-30 returned to the field due to loss of primary stabilizer trim. Alternate system operated normally.
| Attributes | |
| ACN | 551607 |
| Time | |
| Date | 200206 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mke.airport |
| State Reference | WI |
| Altitude | msl single value : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : vacating altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 16500 flight time type : 8000 |
| ASRS Report | 551607 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : diverted to another airport |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
During climb out from mke (with the autoplt deferred), crew noted that the primary trim failed to respond when energized from either control wheel position. An attempt was made to energize the primary trim with the 'suitcase handles' and once again, no movement was observed. Crew then tried the alternate trim and observed that it functioned normally. Crew called company maintenance and was instructed to return to mke. Crew reviewed the horizontal stabilizer inoperative (jammed stabilizer) abnormal procedure in order to assure a normal landing could be accomplished with using the alternate trim. During the return to mke and at the appropriate airspds, crew deployed the slats and partial flaps to expedite the fuel burn in order to 'get down' to our landing weight. Callback conversation with reporter revealed the following information: the reporter stated maintenance found the primary or main electric actuator had failed and was replaced with no further reports.
Original NASA ASRS Text
Title: A DC9-30 RETURNED TO THE FIELD DUE TO LOSS OF PRIMARY STABILIZER TRIM. ALTERNATE SYS OPERATED NORMALLY.
Narrative: DURING CLBOUT FROM MKE (WITH THE AUTOPLT DEFERRED), CREW NOTED THAT THE PRIMARY TRIM FAILED TO RESPOND WHEN ENERGIZED FROM EITHER CTL WHEEL POS. AN ATTEMPT WAS MADE TO ENERGIZE THE PRIMARY TRIM WITH THE 'SUITCASE HANDLES' AND ONCE AGAIN, NO MOVEMENT WAS OBSERVED. CREW THEN TRIED THE ALTERNATE TRIM AND OBSERVED THAT IT FUNCTIONED NORMALLY. CREW CALLED COMPANY MAINT AND WAS INSTRUCTED TO RETURN TO MKE. CREW REVIEWED THE HORIZ STABILIZER INOP (JAMMED STABILIZER) ABNORMAL PROC IN ORDER TO ASSURE A NORMAL LNDG COULD BE ACCOMPLISHED WITH USING THE ALTERNATE TRIM. DURING THE RETURN TO MKE AND AT THE APPROPRIATE AIRSPDS, CREW DEPLOYED THE SLATS AND PARTIAL FLAPS TO EXPEDITE THE FUEL BURN IN ORDER TO 'GET DOWN' TO OUR LNDG WT. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING INFO: THE RPTR STATED MAINT FOUND THE PRIMARY OR MAIN ELECTRIC ACTUATOR HAD FAILED AND WAS REPLACED WITH NO FURTHER RPTS.
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.