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Small aircraft IFR encounters icing conditions en route to rbl. Is cleared to climb to FL190 where forecast was to be on top. At FL190 picking up light icing and request descent to 5000 ft. Cleared to descend to 16000 ft and advise intention. Request vector to eug. Changed to eug approach control and descended to 9000 ft between layers and elected to continue flight with no further problems. During rapid descent had deviated from V23 4 degrees.
| Attributes | |
| ACN | 354166 |
| Time | |
| Date | 199611 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : btg |
| State Reference | WA |
| Altitude | msl bound lower : 9000 msl bound upper : 21000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse tracon : eug |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other descent other |
| Route In Use | enroute : on vectors enroute airway : v23 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : private |
| Experience | flight time last 90 days : 17 flight time total : 744 flight time type : 222 |
| ASRS Report | 354166 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | inflight encounter : weather non adherence : clearance other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : exited adverse environment |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Departed thun field, pierce county, wa (1s0) at approximately XA00Z under IFR. Ceiling 3000-4000 ft overcast. Occasional light rime or mixed ice reported/forecast from freezing level (7000-9000 ft MSL) to FL200. PIREPS reported tops at 16000 ft to FL180 along route of flight. Climbed to FL190 and intercepted J-1 without incident. Still IMC at FL190. Cleared to proceed as filed to red bluff, ca (V23) after battle ground VOR. Several mins south of battle ground VOR began to pick up trace rime ice and requested climb to FL210. Still in IMC at FL210 (+5 degrees F) began to accumulate mixed ice on windshield, leading edge of wings, tail, and propeller (inferred). Requested immediate descent to 5000 ft MSL. Initially cleared to descend to 16000 ft and eventually cleared to 5000 ft by ZSE. Descent made at 2000 FPM. Asked by center to state the nature of our problem, replied 'we've accumulated some ice.' asked by center to repeat nature of problem, stated 'we're picking up a little ice.' center asked that we state our intentions, and we replied 'continue heading 175 degrees to eugene, oregon.' inadvertently deviated to east of V23 (at least 4 degrees) during rapid descent while attention was focused on ascertaining whether aircraft performance was deteriorating. Center handed us off to cascade approach during descent. Leveled off at 9000 ft MSL (between cloud layers). Cleared to maintain 9000 ft and given clearance and radar vector direct to roseburg VOR by cascade approach. Proceeded on course without further incident. Pilot and 1 passenger on board.
Original NASA ASRS Text
Title: SMA IFR ENCOUNTERS ICING CONDITIONS ENRTE TO RBL. IS CLRED TO CLB TO FL190 WHERE FORECAST WAS TO BE ON TOP. AT FL190 PICKING UP LIGHT ICING AND REQUEST DSCNT TO 5000 FT. CLRED TO DSND TO 16000 FT AND ADVISE INTENTION. REQUEST VECTOR TO EUG. CHANGED TO EUG APCH CTL AND DSNDED TO 9000 FT BTWN LAYERS AND ELECTED TO CONTINUE FLT WITH NO FURTHER PROBS. DURING RAPID DSCNT HAD DEVIATED FROM V23 4 DEGS.
Narrative: DEPARTED THUN FIELD, PIERCE COUNTY, WA (1S0) AT APPROX XA00Z UNDER IFR. CEILING 3000-4000 FT OVCST. OCCASIONAL LIGHT RIME OR MIXED ICE RPTED/FORECAST FROM FREEZING LEVEL (7000-9000 FT MSL) TO FL200. PIREPS RPTED TOPS AT 16000 FT TO FL180 ALONG RTE OF FLT. CLBED TO FL190 AND INTERCEPTED J-1 WITHOUT INCIDENT. STILL IMC AT FL190. CLRED TO PROCEED AS FILED TO RED BLUFF, CA (V23) AFTER BATTLE GROUND VOR. SEVERAL MINS S OF BATTLE GROUND VOR BEGAN TO PICK UP TRACE RIME ICE AND REQUESTED CLB TO FL210. STILL IN IMC AT FL210 (+5 DEGS F) BEGAN TO ACCUMULATE MIXED ICE ON WINDSHIELD, LEADING EDGE OF WINGS, TAIL, AND PROP (INFERRED). REQUESTED IMMEDIATE DSCNT TO 5000 FT MSL. INITIALLY CLRED TO DSND TO 16000 FT AND EVENTUALLY CLRED TO 5000 FT BY ZSE. DSCNT MADE AT 2000 FPM. ASKED BY CTR TO STATE THE NATURE OF OUR PROB, REPLIED 'WE'VE ACCUMULATED SOME ICE.' ASKED BY CTR TO REPEAT NATURE OF PROB, STATED 'WE'RE PICKING UP A LITTLE ICE.' CTR ASKED THAT WE STATE OUR INTENTIONS, AND WE REPLIED 'CONTINUE HDG 175 DEGS TO EUGENE, OREGON.' INADVERTENTLY DEVIATED TO E OF V23 (AT LEAST 4 DEGS) DURING RAPID DSCNT WHILE ATTN WAS FOCUSED ON ASCERTAINING WHETHER ACFT PERFORMANCE WAS DETERIORATING. CTR HANDED US OFF TO CASCADE APCH DURING DSCNT. LEVELED OFF AT 9000 FT MSL (BTWN CLOUD LAYERS). CLRED TO MAINTAIN 9000 FT AND GIVEN CLRNC AND RADAR VECTOR DIRECT TO ROSEBURG VOR BY CASCADE APCH. PROCEEDED ON COURSE WITHOUT FURTHER INCIDENT. PLT AND 1 PAX ON BOARD.
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.