Heading deviation. Autoplt left in shallow turn.

Attributes
ACN	303361
Time
Date	199504
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : srq
State Reference	FL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx tower : cys
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 8500 flight time type : 2000
ASRS Report	303361
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flying wbound on sarasota VOR 288 degree radial and transiting on leeville 102 degree radial at cruise I turned to keep on course with autoplt just prior to point on out of range from both VOR's, evidently the autoplt stayed in a small 2-3 degree turn to the south and I noticed we were approximately 30 degrees off course to the south. I corrected by turning back to get on course but we were unable to determine the course because neither VOR had a 'lock on' and about the time we finally got leeville 102 degree radial locked on, ZJX told us a heading to correct to on course. There was no conflict with any aircraft and our TCASII shown no traffic in our area.

Original NASA ASRS Text

Title: HDG DEV. AUTOPLT LEFT IN SHALLOW TURN.

Narrative: FLYING WBOUND ON SARASOTA VOR 288 DEG RADIAL AND TRANSITING ON LEEVILLE 102 DEG RADIAL AT CRUISE I TURNED TO KEEP ON COURSE WITH AUTOPLT JUST PRIOR TO POINT ON OUT OF RANGE FROM BOTH VOR'S, EVIDENTLY THE AUTOPLT STAYED IN A SMALL 2-3 DEG TURN TO THE S AND I NOTICED WE WERE APPROX 30 DEGS OFF COURSE TO THE S. I CORRECTED BY TURNING BACK TO GET ON COURSE BUT WE WERE UNABLE TO DETERMINE THE COURSE BECAUSE NEITHER VOR HAD A 'LOCK ON' AND ABOUT THE TIME WE FINALLY GOT LEEVILLE 102 DEG RADIAL LOCKED ON, ZJX TOLD US A HDG TO CORRECT TO ON COURSE. THERE WAS NO CONFLICT WITH ANY ACFT AND OUR TCASII SHOWN NO TFC IN OUR AREA.

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.