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Heading track deviation in a B737 when crew claims autoplt disconnected in the lateral mode during moderate turbulence 40 NM southwest of hpw, va.
| Attributes | |
| ACN | 575736 |
| Time | |
| Date | 200303 |
| Day | Sat |
| Place | |
| Locale Reference | navaid : hpw.vortac |
| State Reference | VA |
| Altitude | msl single value : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | Turbulence |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j55.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 6500 flight time type : 1300 |
| ASRS Report | 575736 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : less severe inflight encounter : turbulence non adherence : clearance other anomaly other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued advisory controller : issued new clearance flight crew : regained aircraft control flight crew : exited adverse environment |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Environmental Factor Aircraft Weather |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
At FL330, the aircraft entered sudden moderate turbulence, and the autoplt disengaged from lateral navigation. Turbulence lasted for about 2 mins, and when it ended, we were displaced from our planned route of flight. ATC was upset at our course deviation, but nothing could be done about it due to the moderate turbulence we went through. When we had the aircraft stabilized, ATC gave us a vector to intercept J55 inbound to hpw VOR. As we turned, we had over a 100 KT tailwind that blew us through the radar due to the 90 degree turning vector. ATC was further upset with our navigating, and we did make a PIREP about the moderate turbulence. Factors affecting human performance -- ATC was unaware of our turbulence, and not realizing that, was the cause of our unintentional flight plan deviation.
Original NASA ASRS Text
Title: HDG TRACK DEV IN A B737 WHEN CREW CLAIMS AUTOPLT DISCONNECTED IN THE LATERAL MODE DURING MODERATE TURB 40 NM SW OF HPW, VA.
Narrative: AT FL330, THE ACFT ENTERED SUDDEN MODERATE TURB, AND THE AUTOPLT DISENGAGED FROM LATERAL NAV. TURB LASTED FOR ABOUT 2 MINS, AND WHEN IT ENDED, WE WERE DISPLACED FROM OUR PLANNED RTE OF FLT. ATC WAS UPSET AT OUR COURSE DEV, BUT NOTHING COULD BE DONE ABOUT IT DUE TO THE MODERATE TURB WE WENT THROUGH. WHEN WE HAD THE ACFT STABILIZED, ATC GAVE US A VECTOR TO INTERCEPT J55 INBOUND TO HPW VOR. AS WE TURNED, WE HAD OVER A 100 KT TAILWIND THAT BLEW US THROUGH THE RADAR DUE TO THE 90 DEG TURNING VECTOR. ATC WAS FURTHER UPSET WITH OUR NAVING, AND WE DID MAKE A PIREP ABOUT THE MODERATE TURB. FACTORS AFFECTING HUMAN PERFORMANCE -- ATC WAS UNAWARE OF OUR TURB, AND NOT REALIZING THAT, WAS THE CAUSE OF OUR UNINTENTIONAL FLT PLAN DEV.
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.