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EMB145 became unstable about the vertical axis during climbout. Flight crew declared an emergency and returned to airport.
| Attributes | |
| ACN | 742823 |
| Time | |
| Date | 200706 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : zzz.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial |
| Route In Use | departure sid : n/a |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 256 flight time total : 3649 flight time type : 790 |
| ASRS Report | 742823 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 1700 flight time type : 750 |
| ASRS Report | 742824 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : declared emergency flight crew : landed as precaution flight crew : diverted to another airport |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
We took off out of ZZZ. Winds were about 330 degrees at 11 KTS. The aircraft ahead of us was an airbus 320 and it used a large amount of runway. We were roughly only 38000 pounds; on a repos flight. I rotated well before the airbus. I immediately noticed instability about the vertical axis. At 500 ft; my first officer engaged the yaw damper and it indicated 'yaw damper fail' caution message. I took the radios and controls while my first officer referenced the company QRH. I asked ATC for a heading and altitude to stay out of the way. My first officer could not find the proper checklist. So we could not determine the reason for the control instability or the severity of the situation. Departure asked if we wanted to declare an emergency; which I did; due to not knowing the problem. We notified our company and the only passenger and the flight attendant that we would be returning. Then returned to land without incident.
Original NASA ASRS Text
Title: EMB145 BECAME UNSTABLE ABOUT THE VERTICAL AXIS DURING CLIMBOUT. FLT CREW DECLARED AN EMER AND RETURNED TO ARPT.
Narrative: WE TOOK OFF OUT OF ZZZ. WINDS WERE ABOUT 330 DEGS AT 11 KTS. THE ACFT AHEAD OF US WAS AN AIRBUS 320 AND IT USED A LARGE AMOUNT OF RWY. WE WERE ROUGHLY ONLY 38000 LBS; ON A REPOS FLT. I ROTATED WELL BEFORE THE AIRBUS. I IMMEDIATELY NOTICED INSTABILITY ABOUT THE VERT AXIS. AT 500 FT; MY FO ENGAGED THE YAW DAMPER AND IT INDICATED 'YAW DAMPER FAIL' CAUTION MESSAGE. I TOOK THE RADIOS AND CTLS WHILE MY FO REFED THE COMPANY QRH. I ASKED ATC FOR A HDG AND ALT TO STAY OUT OF THE WAY. MY FO COULD NOT FIND THE PROPER CHKLIST. SO WE COULD NOT DETERMINE THE REASON FOR THE CTL INSTABILITY OR THE SEVERITY OF THE SIT. DEP ASKED IF WE WANTED TO DECLARE AN EMER; WHICH I DID; DUE TO NOT KNOWING THE PROB. WE NOTIFIED OUR COMPANY AND THE ONLY PAX AND THE FLT ATTENDANT THAT WE WOULD BE RETURNING. THEN RETURNED TO LAND WITHOUT INCIDENT.
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.