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Preflight inspection -- air carrier experienced roll to the left after takeoff and the flight crew declared an emergency and returned to land. In the pattern they discovered that the aileron trim was mis-set.
| Attributes | |
| ACN | 311180 |
| Time | |
| Date | 199507 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : cvg |
| State Reference | OH |
| Altitude | agl bound lower : 400 agl bound upper : 400 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : cvg |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | climbout : initial |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 7800 flight time type : 4000 |
| ASRS Report | 311180 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : declared emergency flight crew : overcame equipment problem other |
| Consequence | faa : investigated Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
After takeoff on runway 18R, first officer flying, stated that the aircraft wanted to roll hard left. We both got on the controls to maintain level flight. We tried to evaluate the situation. Could not find the problem. We declared an emergency and returned and landed with no problem. We performed all checklist and company procedures. On downwind we found the aileron trim to be at 10 units left, it should be at 1 or zero. Contributing factors. 8.5 hours on duty. 3RD aircraft change with minimum turn time. First officer checked aileron trim and it appeared to be normal 1 or zero. Corrective action. Mark trim with green ban or remove 10 unit position. Callback conversation with reporter revealed the following information: the flight crew of this emb-120 brasilia simply missed the aileron trim having been mis- set. When the first officer looked at the trim indices at the rear of the aisle stand he thought that the indicator was pointing at 1 or 0 instead of 10 units. After the flight crew had declared the emergency and entered the pattern for a landing they discovered the source of the roll input and zeroed the trim. They landed anyway and had maintenance confirm their findings. The FAA has investigated the incident and deferred discipline to the company.
Original NASA ASRS Text
Title: PREFLT INSPECTION -- ACR EXPERIENCED ROLL TO THE L AFTER TKOF AND THE FLC DECLARED AN EMER AND RETURNED TO LAND. IN THE PATTERN THEY DISCOVERED THAT THE AILERON TRIM WAS MIS-SET.
Narrative: AFTER TKOF ON RWY 18R, FO FLYING, STATED THAT THE ACFT WANTED TO ROLL HARD L. WE BOTH GOT ON THE CTLS TO MAINTAIN LEVEL FLT. WE TRIED TO EVALUATE THE SIT. COULD NOT FIND THE PROB. WE DECLARED AN EMER AND RETURNED AND LANDED WITH NO PROB. WE PERFORMED ALL CHKLIST AND COMPANY PROCS. ON DOWNWIND WE FOUND THE AILERON TRIM TO BE AT 10 UNITS L, IT SHOULD BE AT 1 OR ZERO. CONTRIBUTING FACTORS. 8.5 HRS ON DUTY. 3RD ACFT CHANGE WITH MINIMUM TURN TIME. FO CHKED AILERON TRIM AND IT APPEARED TO BE NORMAL 1 OR ZERO. CORRECTIVE ACTION. MARK TRIM WITH GREEN BAN OR REMOVE 10 UNIT POS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE FLC OF THIS EMB-120 BRASILIA SIMPLY MISSED THE AILERON TRIM HAVING BEEN MIS- SET. WHEN THE FO LOOKED AT THE TRIM INDICES AT THE REAR OF THE AISLE STAND HE THOUGHT THAT THE INDICATOR WAS POINTING AT 1 OR 0 INSTEAD OF 10 UNITS. AFTER THE FLC HAD DECLARED THE EMER AND ENTERED THE PATTERN FOR A LNDG THEY DISCOVERED THE SOURCE OF THE ROLL INPUT AND ZEROED THE TRIM. THEY LANDED ANYWAY AND HAD MAINT CONFIRM THEIR FINDINGS. THE FAA HAS INVESTIGATED THE INCIDENT AND DEFERRED DISCIPLINE TO THE COMPANY.
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.