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An air carrier flight crew deviated from an assigned altitude due to failures of the autoplt altitude hold, and the stabilizer cruise trim.
| Attributes | |
| ACN | 296610 |
| Time | |
| Date | 199502 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 10700 msl bound upper : 11000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw tower : fll |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 296610 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Approaching dfw on the scy 7 arrival and level at 11000 ft, approach requested airspeed reduction to 210 KTS. After the aircraft slowed as expected, and still on autoplt altitude hold, the aircraft drifted from 11000 ft indicated to 10700 ft at which time we were alerted by the altitude alerter that the aircraft was off scheduled altitude. Disconnecting the autoplt excessive nose down trim was noted. Stabilizer out of trim light was on and the stabilizer cruise trim was found to be inoperative. The aircraft was returned to 11000 ft via hand flying. No conflict with ATC was noted. An E-6 entry was made reporting the failed stabilizer cruise trim. The flight continued to landing without further incident.
Original NASA ASRS Text
Title: AN ACR FLC DEVIATED FROM AN ASSIGNED ALT DUE TO FAILURES OF THE AUTOPLT ALT HOLD, AND THE STABILIZER CRUISE TRIM.
Narrative: APCHING DFW ON THE SCY 7 ARR AND LEVEL AT 11000 FT, APCH REQUESTED AIRSPD REDUCTION TO 210 KTS. AFTER THE ACFT SLOWED AS EXPECTED, AND STILL ON AUTOPLT ALT HOLD, THE ACFT DRIFTED FROM 11000 FT INDICATED TO 10700 FT AT WHICH TIME WE WERE ALERTED BY THE ALT ALERTER THAT THE ACFT WAS OFF SCHEDULED ALT. DISCONNECTING THE AUTOPLT EXCESSIVE NOSE DOWN TRIM WAS NOTED. STABILIZER OUT OF TRIM LIGHT WAS ON AND THE STABILIZER CRUISE TRIM WAS FOUND TO BE INOP. THE ACFT WAS RETURNED TO 11000 FT VIA HAND FLYING. NO CONFLICT WITH ATC WAS NOTED. AN E-6 ENTRY WAS MADE RPTING THE FAILED STABILIZER CRUISE TRIM. THE FLT CONTINUED TO LNDG WITHOUT FURTHER INCIDENT.
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.