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Government small transport altitude deviation excursion from clearance altitude when autoplt drove aircraft trim full nose down.
| Attributes | |
| ACN | 173468 |
| Time | |
| Date | 199103 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : rdu |
| State Reference | NC |
| Altitude | msl bound lower : 6450 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : rdu |
| Operator | other |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government other |
| Function | flight crew : single pilot |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 16000 flight time type : 2000 |
| ASRS Report | 173468 |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : declared emergency |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Autoplt drove trim to full nose down trim and then autoplt disconnected on altitude hold. Approximately 1 1/2-2 G neg noseover and dive recovered in 500-550'. Declared emergency, disabled autoplt, retrimmed aircraft and climbed back to assigned altitude. At this point cancelled emergency.
Original NASA ASRS Text
Title: GOV SMT ALT DEVIATION EXCURSION FROM CLRNC ALT WHEN AUTOPLT DROVE ACFT TRIM FULL NOSE DOWN.
Narrative: AUTOPLT DROVE TRIM TO FULL NOSE DOWN TRIM AND THEN AUTOPLT DISCONNECTED ON ALT HOLD. APPROX 1 1/2-2 G NEG NOSEOVER AND DIVE RECOVERED IN 500-550'. DECLARED EMER, DISABLED AUTOPLT, RETRIMMED ACFT AND CLBED BACK TO ASSIGNED ALT. AT THIS POINT CANCELLED EMER.
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.