Heavy transport cargo flight crew is 25 NM off course from oceanic airway.

Attributes
ACN	194474
Time
Date	199111
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : fot
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Heavy Transport, Low Wing, 4 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : other oceanic enroute : pacific enroute airway : zse
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 170 flight time total : 11000 flight time type : 2838
ASRS Report	194474
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was flying as first officer on an heavy transport airlines cargo flight from anchorage to los angeles. We were proceeding down airway B453 to enter control 1416 at daash intersection, off of the USA west coast. We were approaching daash intersection when seattle center advised us that they had observed us on radar as being 25 mi to the left of course. This incident resulted from the following situation: approximately 200 mi prior to reaching daash intersection we disconnected the input from the autoplt as the unit was continually banking the airplane to the left and right. After this autoplt was manually operated by ourselves using the turn knob. At approximately 100 mi prior to daash we were experiencing communications difficulties with ATC on the VHF and HF radios due to poor radio signal propagation. The communication problem distraction us from monitoring the x-track readout of the navigation units, and during this time the right crosswind had increased, resulting in our deviation to the left of track.

Original NASA ASRS Text

Title: HVT CARGO FLC IS 25 NM OFF COURSE FROM OCEANIC AIRWAY.

Narrative: I WAS FLYING AS FO ON AN HVT AIRLINES CARGO FLT FROM ANCHORAGE TO LOS ANGELES. WE WERE PROCEEDING DOWN AIRWAY B453 TO ENTER CTL 1416 AT DAASH INTXN, OFF OF THE USA W COAST. WE WERE APCHING DAASH INTXN WHEN SEATTLE CENTER ADVISED US THAT THEY HAD OBSERVED US ON RADAR AS BEING 25 MI TO THE L OF COURSE. THIS INCIDENT RESULTED FROM THE FOLLOWING SITUATION: APPROX 200 MI PRIOR TO REACHING DAASH INTXN WE DISCONNECTED THE INPUT FROM THE AUTOPLT AS THE UNIT WAS CONTINUALLY BANKING THE AIRPLANE TO THE L AND R. AFTER THIS AUTOPLT WAS MANUALLY OPERATED BY OURSELVES USING THE TURN KNOB. AT APPROX 100 MI PRIOR TO DAASH WE WERE EXPERIENCING COMS DIFFICULTIES WITH ATC ON THE VHF AND HF RADIOS DUE TO POOR RADIO SIGNAL PROPAGATION. THE COM PROBLEM DISTR US FROM MONITORING THE X-TRACK READOUT OF THE NAV UNITS, AND DURING THIS TIME THE R XWIND HAD INCREASED, RESULTING IN OUR DEV TO THE L OF TRACK.

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.