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MD90 crew had an altitude deviation and heading deviation after the autoplt alternate longitudinal trim circuit breakers popped.
| Attributes | |
| ACN | 632894 |
| Time | |
| Date | 200410 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : ogd.vortac |
| State Reference | UT |
| Altitude | msl single value : 15000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : s56.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | MD-90 Series (DC-9-90) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival star : bearr |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 225 flight time total : 6700 flight time type : 4200 |
| ASRS Report | 632894 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 15000 flight time type : 2000 |
| ASRS Report | 633100 |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance other spatial deviation |
| Independent Detector | atc equipment other atc equipment : radar other controllera |
| Resolutory Action | controller : issued advisory flight crew : returned to original clearance other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Level on the bearr arrival to slc, the autoplt/altitude trim circuit breaker popped (2 of 3). Simultaneously received a 30 degree left radar vector from ATC. Captain turned to identify popped circuit breakers and did not hear clearance. Altitude hold feature was unable to hold the altitude due to aircraft being out of trim (nose down) and aircraft descended approximately 500 ft before recovery was made. ATC inquired about heading and turn was initiated. No traffic was noted in the vicinity and ATC never indicated any conflict with other aircraft. Aircraft hand flown/trimmed for duration of flight. Maintenance addressed problem in slc upon arrival.
Original NASA ASRS Text
Title: MD90 CREW HAD AN ALTDEV AND HDG DEV AFTER THE AUTOPLT ALTERNATE LONGITUDINAL TRIM CIRCUIT BREAKERS POPPED.
Narrative: LEVEL ON THE BEARR ARR TO SLC, THE AUTOPLT/ALT TRIM CIRCUIT BREAKER POPPED (2 OF 3). SIMULTANEOUSLY RECEIVED A 30 DEG L RADAR VECTOR FROM ATC. CAPT TURNED TO IDENT POPPED CIRCUIT BREAKERS AND DID NOT HEAR CLRNC. ALT HOLD FEATURE WAS UNABLE TO HOLD THE ALT DUE TO ACFT BEING OUT OF TRIM (NOSE DOWN) AND ACFT DSNDED APPROX 500 FT BEFORE RECOVERY WAS MADE. ATC INQUIRED ABOUT HDG AND TURN WAS INITIATED. NO TFC WAS NOTED IN THE VICINITY AND ATC NEVER INDICATED ANY CONFLICT WITH OTHER ACFT. ACFT HAND FLOWN/TRIMMED FOR DURATION OF FLT. MAINT ADDRESSED PROB IN SLC UPON ARR.
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.