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F100 aircraft with descent clearance, flight crew entered data into FMS and when profile was selected in the MCP, the aircraft immediately went into a climb. Flight crew disconnected the autoplt and returned to profile using the #2 FMS.
| Attributes | |
| ACN | 370232 |
| Time | |
| Date | 199706 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ric |
| State Reference | VA |
| Altitude | msl bound lower : 22000 msl bound upper : 22500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 180 flight time total : 9260 flight time type : 1410 |
| ASRS Report | 370232 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : flight engineer pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 150 flight time total : 10800 flight time type : 1600 |
| ASRS Report | 370760 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Flight from rdu to dca. After clearance to cross ric at FL220, aircraft was level at FL220 with autoplt #1 selected on. Received clearance to cross ojaay (irons 3 arrival, dca) at 10000 ft, 250 KTS. This was entered in the FMC and in the autoplt MCP. 'Profile' was selected on the MCP. The aircraft entered an uncommanded climb, the autoplt was disengaged and a hand-flown descent was initiated. Altitude deviation was +500 ft (FL225). After the descent was under control, the #1 FMS showed approximately 1200 ft below the profile and the #2 FMS showed 800 ft above profile. #2 FMS was determined to be correct and the #2 autoplt was engaged. Remainder of flight was uneventful. The FMS was written up upon arrival at dca. An air safety report was filed with our company, and an altitude awareness program incident data form was also filed.
Original NASA ASRS Text
Title: F100 ACFT WITH DSCNT CLRNC, FLC ENTERED DATA INTO FMS AND WHEN PROFILE WAS SELECTED IN THE MCP, THE ACFT IMMEDIATELY WENT INTO A CLB. FLC DISCONNECTED THE AUTOPLT AND RETURNED TO PROFILE USING THE #2 FMS.
Narrative: FLT FROM RDU TO DCA. AFTER CLRNC TO CROSS RIC AT FL220, ACFT WAS LEVEL AT FL220 WITH AUTOPLT #1 SELECTED ON. RECEIVED CLRNC TO CROSS OJAAY (IRONS 3 ARR, DCA) AT 10000 FT, 250 KTS. THIS WAS ENTERED IN THE FMC AND IN THE AUTOPLT MCP. 'PROFILE' WAS SELECTED ON THE MCP. THE ACFT ENTERED AN UNCOMMANDED CLB, THE AUTOPLT WAS DISENGAGED AND A HAND-FLOWN DSCNT WAS INITIATED. ALTDEV WAS +500 FT (FL225). AFTER THE DSCNT WAS UNDER CTL, THE #1 FMS SHOWED APPROX 1200 FT BELOW THE PROFILE AND THE #2 FMS SHOWED 800 FT ABOVE PROFILE. #2 FMS WAS DETERMINED TO BE CORRECT AND THE #2 AUTOPLT WAS ENGAGED. REMAINDER OF FLT WAS UNEVENTFUL. THE FMS WAS WRITTEN UP UPON ARR AT DCA. AN AIR SAFETY RPT WAS FILED WITH OUR COMPANY, AND AN ALT AWARENESS PROGRAM INCIDENT DATA FORM WAS ALSO FILED.
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.