|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||atc facility : hio|
|Altitude||msl bound lower : 6000|
msl bound upper : 6000
|Controlling Facilities||artcc : zse|
|Operator||general aviation : instructional|
|Make Model Name||Small Aircraft, High Wing, 1 Eng, Fixed Gear|
|Flight Phase||climbout : intermediate altitude|
|Route In Use||enroute airway : v165|
|Function||flight crew : single pilot|
|Qualification||pilot : private|
pilot : instrument
|Experience||flight time last 90 days : 30|
flight time total : 231
flight time type : 100
|Affiliation||government : faa|
|Function||controller : radar|
|Qualification||controller : radar|
|Anomaly||inflight encounter : weather|
non adherence : clearance
other spatial deviation
|Independent Detector||other controllera|
|Resolutory Action||controller : issued new clearance|
|Air Traffic Incident||Pilot Deviation|
I departed IFR from portland/hillsboro. Encountered light fog, then IMC conditions, proceeded on my assigned route (V165 to olympia VOR then to seattle/boeing field). At the end of climb to 6000' seattle center said I was off course, I thought I was still on course. I got a vector back to course that was about 40 degree. I then looked out at my wings with a flashlight and saw I had accumulated quite a lot of ice that explained why I was off course. I told center of my icing and got a lower altitude. Callback conversation with reporter revealed the following: the reporter had done a vot check before takeoff and the navigation error was less than 3 degree. Not enough to put the aircraft 6 mi off track as reported by ARTCC. Other members of flying club confirmed they had been exposed to the same problems in icing conditions.
Original NASA ASRS Text
Title: GA SMA TRACK DEVIATION DUE ICE ACCUMULATION ON VOR ANTENNA.
Narrative: I DEPARTED IFR FROM PORTLAND/HILLSBORO. ENCOUNTERED LIGHT FOG, THEN IMC CONDITIONS, PROCEEDED ON MY ASSIGNED ROUTE (V165 TO OLYMPIA VOR THEN TO SEATTLE/BOEING FIELD). AT THE END OF CLIMB TO 6000' SEATTLE CENTER SAID I WAS OFF COURSE, I THOUGHT I WAS STILL ON COURSE. I GOT A VECTOR BACK TO COURSE THAT WAS ABOUT 40 DEG. I THEN LOOKED OUT AT MY WINGS WITH A FLASHLIGHT AND SAW I HAD ACCUMULATED QUITE A LOT OF ICE THAT EXPLAINED WHY I WAS OFF COURSE. I TOLD CENTER OF MY ICING AND GOT A LOWER ALT. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: THE RPTR HAD DONE A VOT CHECK BEFORE TKOF AND THE NAV ERROR WAS LESS THAN 3 DEG. NOT ENOUGH TO PUT THE ACFT 6 MI OFF TRACK AS REPORTED BY ARTCC. OTHER MEMBERS OF FLYING CLUB CONFIRMED THEY HAD BEEN EXPOSED TO THE SAME PROBLEMS IN ICING CONDITIONS.
Data retrieved from NASA's ASRS site as of August 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.