 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Flight crew of a fokker 100 overshot cruise descent altitude change by 200 ft due to turbulence and autoplt dampening in turbulence resulting in a conflict with another aircraft 700 ft lower.
| Attributes | |
| ACN | 500485 |
| Time | |
| Date | 200102 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : atl.vortac |
| State Reference | GA |
| Altitude | msl bound lower : 26800 msl bound upper : 27000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | cruise : enroute altitude change descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 8500 flight time type : 1200 |
| ASRS Report | 500485 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 235 flight time total : 19000 flight time type : 700 |
| ASRS Report | 501360 |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe inflight encounter : weather inflight encounter : turbulence non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : radar aircraft equipment other aircraft equipment : altimeter other controllera |
| Resolutory Action | controller : issued alert flight crew : returned to assigned altitude |
| Consequence | faa : investigated |
| Miss Distance | vertical : 700 |
| Supplementary | |
| Problem Areas | Weather Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
ZTL descended our flight to FL270 from FL280. In our descent, we encountered light to moderate chop. Captain was flying and slowed aircraft from 270 KIAS to 250 KIAS. The autoplt overshot altitude by 200 ft to FL268. The autoplt was recovering to FL270, when ATC asked if we were level at FL270. There was an air carrier Y jet at FL260 and said there was a 700 ft difference. We never received a TA or RA. Our altitude was never more than FL268 when the autoplt overshot.
Original NASA ASRS Text
Title: FLC OF A FOKKER 100 OVERSHOT CRUISE DSCNT ALT CHANGE BY 200 FT DUE TO TURB AND AUTOPLT DAMPENING IN TURB RESULTING IN A CONFLICT WITH ANOTHER ACFT 700 FT LOWER.
Narrative: ZTL DSNDED OUR FLT TO FL270 FROM FL280. IN OUR DSCNT, WE ENCOUNTERED LIGHT TO MODERATE CHOP. CAPT WAS FLYING AND SLOWED ACFT FROM 270 KIAS TO 250 KIAS. THE AUTOPLT OVERSHOT ALT BY 200 FT TO FL268. THE AUTOPLT WAS RECOVERING TO FL270, WHEN ATC ASKED IF WE WERE LEVEL AT FL270. THERE WAS AN ACR Y JET AT FL260 AND SAID THERE WAS A 700 FT DIFFERENCE. WE NEVER RECEIVED A TA OR RA. OUR ALT WAS NEVER MORE THAN FL268 WHEN THE AUTOPLT OVERSHOT.
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.