Air carrier medium large transport track heading deviation on a night frt flight.

Attributes
ACN	194340
Time
Date	199111
Day	Thu
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : yak
State Reference	AK
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zan tower : pae
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : j133
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp pilot : cfi
Experience	flight time last 90 days : 250 flight time total : 10000 flight time type : 210
ASRS Report	194340
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : commercial pilot : instrument pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 6000 flight time type : 2500
ASRS Report	194681
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While en route on J133 bka direct joh autoplt began a slight right bank and turn was continued for 120 degree putting our position some 25-30 mi off course before position was detected by crew. While correcting to course center asked us our position as they lost radar contact with us. We responded with our radial and DME off yak VOR 265/30 DME and requested radar vectors to anc as we were once again in radar contact.

Original NASA ASRS Text

Title: ACR MLG TRACK HDG DEV ON A NIGHT FRT FLT.

Narrative: WHILE ENRTE ON J133 BKA DIRECT JOH AUTOPLT BEGAN A SLIGHT R BANK AND TURN WAS CONTINUED FOR 120 DEG PUTTING OUR POS SOME 25-30 MI OFF COURSE BEFORE POS WAS DETECTED BY CREW. WHILE CORRECTING TO COURSE CENTER ASKED US OUR POS AS THEY LOST RADAR CONTACT WITH US. WE RESPONDED WITH OUR RADIAL AND DME OFF YAK VOR 265/30 DME AND REQUESTED RADAR VECTORS TO ANC AS WE WERE ONCE AGAIN IN RADAR CONTACT.

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.