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A giv crew encountered moderate to severe turbulence after departing bwi and lost their yaw damper and autoplt. They climbed without clearance because aircraft control was in doubt.
| Attributes | |
| ACN | 697300 |
| Time | |
| Date | 200605 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zdc.artcc |
| State Reference | VA |
| Altitude | msl single value : 17000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Turbulence |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Gulfstream IV |
| Operating Under FAR Part | Part 135 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 80 flight time total : 12700 flight time type : 3200 |
| ASRS Report | 697300 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi pilot : instrument |
| Experience | flight time last 90 days : 70 flight time total : 8660 flight time type : 2200 |
| ASRS Report | 696635 |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude inflight encounter : turbulence non adherence : clearance non adherence : far |
| Independent Detector | other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated controller : issued new clearance flight crew : exited adverse environment |
| Supplementary | |
| Problem Areas | Weather Aircraft |
| Primary Problem | Weather |
Narrative:
After departing bwi we were wbound on radar vectors and at an assigned altitude of 17000 ft. We had been experiencing continuous moderate turbulence and had requested higher to clear the tops of the clouds that we were flying in. The intensity of the turbulence increased and we advised center again that we were 'getting pounded' and we really needed to climb. ZDC advised that they were unable; but they gave us a heading change for a climb and said it would be about 1 min. Almost immediately after this transmission we encountered moderate/severe turbulence and lost our yaw damper; pitch trim; autoplt and air data computers. With the loss of the yaw damper we struggled to maintain control of the aircraft in the turbulence -- we immediately notified ZDC that we were climbing out of the turbulence and that we had experienced failure of our yaw damper system and computers. Washington cleared us to FL220 and direct to ihd VOR. I advised that we would be 'straight ahead' while we sorted through our multiple failures and that we were climbing to FL220. The ride improved considerably during the climb. We were able to regain the use of the yaw damper along with the other failed equipment and we then proceeded on course to our destination.
Original NASA ASRS Text
Title: A GIV CREW ENCOUNTERED MODERATE TO SEVERE TURB AFTER DEPARTING BWI AND LOST THEIR YAW DAMPER AND AUTOPLT. THEY CLBED WITHOUT CLRNC BECAUSE ACFT CTL WAS IN DOUBT.
Narrative: AFTER DEPARTING BWI WE WERE WBOUND ON RADAR VECTORS AND AT AN ASSIGNED ALT OF 17000 FT. WE HAD BEEN EXPERIENCING CONTINUOUS MODERATE TURB AND HAD REQUESTED HIGHER TO CLR THE TOPS OF THE CLOUDS THAT WE WERE FLYING IN. THE INTENSITY OF THE TURB INCREASED AND WE ADVISED CTR AGAIN THAT WE WERE 'GETTING POUNDED' AND WE REALLY NEEDED TO CLB. ZDC ADVISED THAT THEY WERE UNABLE; BUT THEY GAVE US A HDG CHANGE FOR A CLB AND SAID IT WOULD BE ABOUT 1 MIN. ALMOST IMMEDIATELY AFTER THIS XMISSION WE ENCOUNTERED MODERATE/SEVERE TURB AND LOST OUR YAW DAMPER; PITCH TRIM; AUTOPLT AND AIR DATA COMPUTERS. WITH THE LOSS OF THE YAW DAMPER WE STRUGGLED TO MAINTAIN CTL OF THE ACFT IN THE TURB -- WE IMMEDIATELY NOTIFIED ZDC THAT WE WERE CLBING OUT OF THE TURB AND THAT WE HAD EXPERIENCED FAILURE OF OUR YAW DAMPER SYS AND COMPUTERS. WASHINGTON CLRED US TO FL220 AND DIRECT TO IHD VOR. I ADVISED THAT WE WOULD BE 'STRAIGHT AHEAD' WHILE WE SORTED THROUGH OUR MULTIPLE FAILURES AND THAT WE WERE CLBING TO FL220. THE RIDE IMPROVED CONSIDERABLY DURING THE CLB. WE WERE ABLE TO REGAIN THE USE OF THE YAW DAMPER ALONG WITH THE OTHER FAILED EQUIP AND WE THEN PROCEEDED ON COURSE TO OUR DEST.
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.