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A cpr light transport climbed 800 ft when the altitude hold was released. WX factors moderate turbulence. Altitude deviation.
| Attributes | |
| ACN | 349530 |
| Time | |
| Date | 199610 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : lrp |
| State Reference | PA |
| Altitude | msl bound lower : 19000 msl bound upper : 19800 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | common carrier : air taxi |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : instrument pilot : cfi pilot : commercial |
| Experience | flight time last 90 days : 140 flight time total : 4490 flight time type : 650 |
| ASRS Report | 349530 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 150 flight time total : 3100 flight time type : 200 |
| ASRS Report | 349519 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cruising at FL190 in moderate turbulence, IMC conditions, we were cleared to 17000 ft. The PF disengaged altitude hold of autoplt and I reached for and started the descent checklist. I looked up at altimeters and alerted the PF that we were at FL198. We immediately both pushed forward on yoke to descend. I assisted him, and notified center that we experienced a major updraft, but were now descending. He gave us a heading of 270 degrees (we were presently on a north heading). I believe that the PF disengaged altitude hold of the autoplt and the turbulence caused the aircraft to climb. Previously, the autoplt was having difficulty holding altitude in the rough air. No evasive actions were required.
Original NASA ASRS Text
Title: A CPR LTT CLBED 800 FT WHEN THE ALT HOLD WAS RELEASED. WX FACTORS MODERATE TURB. ALTDEV.
Narrative: CRUISING AT FL190 IN MODERATE TURB, IMC CONDITIONS, WE WERE CLRED TO 17000 FT. THE PF DISENGAGED ALT HOLD OF AUTOPLT AND I REACHED FOR AND STARTED THE DSCNT CHKLIST. I LOOKED UP AT ALTIMETERS AND ALERTED THE PF THAT WE WERE AT FL198. WE IMMEDIATELY BOTH PUSHED FORWARD ON YOKE TO DSND. I ASSISTED HIM, AND NOTIFIED CTR THAT WE EXPERIENCED A MAJOR UPDRAFT, BUT WERE NOW DSNDING. HE GAVE US A HDG OF 270 DEGS (WE WERE PRESENTLY ON A N HDG). I BELIEVE THAT THE PF DISENGAGED ALT HOLD OF THE AUTOPLT AND THE TURB CAUSED THE ACFT TO CLB. PREVIOUSLY, THE AUTOPLT WAS HAVING DIFFICULTY HOLDING ALT IN THE ROUGH AIR. NO EVASIVE ACTIONS WERE REQUIRED.
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.