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Act maintenance discrepancy discovered by PIC on second leg of flight.
| Attributes | |
| ACN | 298010 |
| Time | |
| Date | 199503 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : fca |
| State Reference | MT |
| Altitude | agl bound lower : 500 agl bound upper : 500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc |
| Operator | common carrier : air carrier |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | climbout : initial climbout : takeoff |
| 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 : 5200 flight time type : 700 |
| ASRS Report | 298010 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 160 flight time total : 3200 flight time type : 300 |
| ASRS Report | 298011 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | none taken : anomaly accepted other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Our trip started in spokane, wa (geg). The plane we were to use had a maintenance write up. The electric trim switch on the captain's side was working intermittently. They replaced the captain's trim switch, signed off the repair 'operations checks good.' the first thing I did when I got in the aircraft was turn on the batteries and push on the trim switch, I heard the normal beep tones, the actual trim motor moving, and noticed the trim indicator needle moving. I pushed the trim switch the opposite way and noticed preflight duties. We did all normal checklists and the first officer flew the first leg from geg to fca (kalispell, mt). We then departed from fca, I flew this leg. On takeoff after the gear was up I started to trim the aircraft and noticed that I was getting reverse movement of the stabilizer. I quickly determined that the captain's trim switch was operating backwards. I directed the first officer to fly the aircraft from that point on. We continued to btm (butte, mt) normally, without any other problems. The plane was written up in btm and maintenance was called. In hindsight I should have also checked the direction of movement in the beginning. No trim check was actually required of the crew, by any checklist or procedure. Supplemental information from acn 298011: it was later discovered that the trim switch had been wired backwards.
Original NASA ASRS Text
Title: ACT MAINT DISCREPANCY DISCOVERED BY PIC ON SECOND LEG OF FLT.
Narrative: OUR TRIP STARTED IN SPOKANE, WA (GEG). THE PLANE WE WERE TO USE HAD A MAINT WRITE UP. THE ELECTRIC TRIM SWITCH ON THE CAPT'S SIDE WAS WORKING INTERMITTENTLY. THEY REPLACED THE CAPT'S TRIM SWITCH, SIGNED OFF THE REPAIR 'OPS CHKS GOOD.' THE FIRST THING I DID WHEN I GOT IN THE ACFT WAS TURN ON THE BATTERIES AND PUSH ON THE TRIM SWITCH, I HEARD THE NORMAL BEEP TONES, THE ACTUAL TRIM MOTOR MOVING, AND NOTICED THE TRIM INDICATOR NEEDLE MOVING. I PUSHED THE TRIM SWITCH THE OPPOSITE WAY AND NOTICED PREFLT DUTIES. WE DID ALL NORMAL CHKLISTS AND THE FO FLEW THE FIRST LEG FROM GEG TO FCA (KALISPELL, MT). WE THEN DEPARTED FROM FCA, I FLEW THIS LEG. ON TKOF AFTER THE GEAR WAS UP I STARTED TO TRIM THE ACFT AND NOTICED THAT I WAS GETTING REVERSE MOVEMENT OF THE STABILIZER. I QUICKLY DETERMINED THAT THE CAPT'S TRIM SWITCH WAS OPERATING BACKWARDS. I DIRECTED THE FO TO FLY THE ACFT FROM THAT POINT ON. WE CONTINUED TO BTM (BUTTE, MT) NORMALLY, WITHOUT ANY OTHER PROBS. THE PLANE WAS WRITTEN UP IN BTM AND MAINT WAS CALLED. IN HINDSIGHT I SHOULD HAVE ALSO CHKED THE DIRECTION OF MOVEMENT IN THE BEGINNING. NO TRIM CHK WAS ACTUALLY REQUIRED OF THE CREW, BY ANY CHKLIST OR PROC. SUPPLEMENTAL INFO FROM ACN 298011: IT WAS LATER DISCOVERED THAT THE TRIM SWITCH HAD BEEN WIRED BACKWARDS.
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.