 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A pilot of a cessna 421 reported of encountering turbulence in IMC and icing conditions in downdrafts of over 1200fpm.
| Attributes | |
| ACN | 1398849 |
| Time | |
| Date | 201610 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Golden Eagle 421 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Flying Single Pilot |
| Qualification | Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 40 Flight Crew Total 4000 Flight Crew Type 90 |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Inflight Event / Encounter Weather / Turbulence |
| Miss Distance | Horizontal 3000 Vertical 1800 |
Narrative:
Picked up an IFR clearance. IFR 14;000. +1*c IMC lost 1;100 feet and nearly 40Kts of indicated airspeed 15-18 negative ice. Downdrafts of +1;200 fpm. Moderate turbulence due to high pitch for downdrafts and airspeed at vyse and decaying rapidly; immediately made a turn to exit the area; regroup then informed the controller. I asked the controller for a higher altitude to try to get clear of the clouds @ 16;000 feet. Wasn't high enough to clear all of the weather; rising behind the initial front and building fast. New altitude 16;000 xa:11 reentered the clouds on course at 16;000 xa:11-xa:15 the flight was un-eventful. Between xa:15-xa:17 we had severe downdrafts again as well as rapid ice accumulation and turbulence light hail and airspeed loss. Pretty busy; but glancing at the OAT -3 . Wasn't able to maintain altitude/heading and lost nearly 1;000 feet with a heavy ice accumulation decaying airspeed with a high power setting. I immediately made a 180* turn to get back into VMC and descended once I had the terrain in sight. Needed airspeed and to get rid of ice. We returned and made an uneventful landing. Cause: rapidly changing conditions and possible embedded thunderstorm not forecast. High winds causing severe downdrafts; mountain wave; and rapid ice accumulation.prevention: fly at an altitude if possible above the weather and below -15c if possible. Reroute more stable air mass.
Original NASA ASRS Text
Title: A pilot of a Cessna 421 reported of encountering turbulence in IMC and icing conditions in downdrafts of over 1200fpm.
Narrative: Picked up an IFR clearance. IFR 14;000. +1*c IMC lost 1;100 feet and nearly 40Kts of indicated airspeed 15-18 negative ice. Downdrafts of +1;200 fpm. Moderate turbulence Due to high pitch for downdrafts and airspeed at VYSE and decaying rapidly; immediately made a turn to exit the area; regroup then informed the controller. I asked the controller for a higher altitude to try to get clear of the clouds @ 16;000 feet. wasn't high enough to clear all of the weather; rising behind the initial front and building fast. New altitude 16;000 XA:11 reentered the clouds on course at 16;000 XA:11-XA:15 the flight was un-eventful. Between XA:15-XA:17 we had severe downdrafts again as well as rapid ice accumulation and turbulence light hail and airspeed loss. Pretty busy; but glancing at the OAT -3 . Wasn't able to maintain altitude/heading and lost nearly 1;000 feet with a heavy ice accumulation decaying airspeed with a high power setting. I immediately made a 180* turn to get back into VMC and descended once I had the terrain in sight. Needed airspeed and to get rid of ice. We returned and made an uneventful landing. Cause: rapidly changing conditions and possible embedded Thunderstorm not forecast. High winds Causing severe downdrafts; mountain wave; and rapid ice accumulation.Prevention: Fly at an altitude if possible above the weather and below -15c if possible. Reroute more stable air mass.
Data retrieved from NASA's ASRS site 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.