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PC12 pilot reports to mem FSDO reason for altitude deviation when at FL290. Pilot states that 'our autoplt inadvertently went offline,' causing the deviation.
| Attributes | |
| ACN | 428449 |
| Time | |
| Date | 199902 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zme.artcc |
| State Reference | TN |
| Altitude | msl single value : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme.artcc |
| Operator | general aviation : personal |
| Make Model Name | Pilatus Britten-Norman Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zme.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : commercial |
| ASRS Report | 428449 |
| Person 2 | |
| Affiliation | other |
| Function | observation : observer |
| Qualification | pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance |
| Independent Detector | other other : fsdo4 |
| Resolutory Action | flight crew : overcame equipment problem flight crew : returned to original clearance |
| Consequence | faa : investigated |
| Miss Distance | vertical : 650 |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
This letter is in response to your (mem FSDO) inquiry about an incident of altitude deviation. Myself and a copilot were flying a brand new pilatus PC12 (aircraft X) from the completion center in broomfield, co, to atlanta, GA. During the flight, while under the control of ZME, our autoplt inadvertently went offline, causing the aircraft to drop 350 ft before it was noticed. Actually, the pilot's side altimeter indicated only a 200 ft drop, while the copilot side altimeter read over 350 ft. Both the autoplt problem and altimeter discrepancy were reported immediately to the pilatus service center in atlanta, and will be addressed forthwith. Please accept my apology for any inconvenience this may have caused.
Original NASA ASRS Text
Title: PC12 PLT RPTS TO MEM FSDO REASON FOR ALTDEV WHEN AT FL290. PLT STATES THAT 'OUR AUTOPLT INADVERTENTLY WENT OFFLINE,' CAUSING THE DEV.
Narrative: THIS LETTER IS IN RESPONSE TO YOUR (MEM FSDO) INQUIRY ABOUT AN INCIDENT OF ALTDEV. MYSELF AND A COPLT WERE FLYING A BRAND NEW PILATUS PC12 (ACFT X) FROM THE COMPLETION CENTER IN BROOMFIELD, CO, TO ATLANTA, GA. DURING THE FLT, WHILE UNDER THE CTL OF ZME, OUR AUTOPLT INADVERTENTLY WENT OFFLINE, CAUSING THE ACFT TO DROP 350 FT BEFORE IT WAS NOTICED. ACTUALLY, THE PLT'S SIDE ALTIMETER INDICATED ONLY A 200 FT DROP, WHILE THE COPLT SIDE ALTIMETER READ OVER 350 FT. BOTH THE AUTOPLT PROB AND ALTIMETER DISCREPANCY WERE RPTED IMMEDIATELY TO THE PILATUS SVC CENTER IN ATLANTA, AND WILL BE ADDRESSED FORTHWITH. PLEASE ACCEPT MY APOLOGY FOR ANY INCONVENIENCE THIS MAY HAVE CAUSED.
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.