 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
SR22 pilot reports altitude deviation with autopilot on and altitude select at 9000 feet on the pfd. Loss of communication between pfd and autopilot is suspected.
| Attributes | |
| ACN | 816148 |
| Time | |
| Date | 200812 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : cty.airport |
| State Reference | FL |
| Altitude | msl single value : 9000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | SR22 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | controller : combined ground |
| Experience | flight time last 90 days : 33 flight time total : 919 flight time type : 480 |
| ASRS Report | 816148 |
| Person 2 | |
| Qualification | pilot : private pilot : instrument |
| 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 assigned altitude |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
Lost communication between pfd and autopilot; possibly the same event as described in cirrus service advisory sa-07-11. After hand flying a portion of the trip; I set the autopilot with altitude select at 9;000 ft on the pfd; but as the communication between the pfd and the south tec 55 autopilot was not functioning; I descended about 250 ft below the 9;000 ft setting before discovering the low altitude. For the remainder of the flight; I hand flew to the required altitude and selected altitude hold directly on the autopilot. I have taken the airplane for a diagnosis as well as annual inspection. I will be more alert in the future.
Original NASA ASRS Text
Title: SR22 pilot reports altitude deviation with autopilot on and altitude select at 9000 feet on the PFD. Loss of communication between PFD and autopilot is suspected.
Narrative: Lost communication between PFD and Autopilot; possibly the same event as described in Cirrus Service Advisory SA-07-11. After hand flying a portion of the trip; I set the autopilot with Altitude Select at 9;000 ft on the PFD; but as the communication between the PFD and the S TEC 55 Autopilot was not functioning; I descended about 250 ft below the 9;000 ft setting before discovering the low altitude. For the remainder of the flight; I hand flew to the required altitude and selected altitude hold directly on the autopilot. I have taken the airplane for a diagnosis as well as annual inspection. I will be more alert in the future.
Data retrieved from NASA's ASRS site as of May 2009 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.