MTR track deviation after encounter with high level jet stream over gbn.

Attributes
ACN	193509
Time
Date	199110
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : gbn
State Reference	AZ
Altitude	msl bound lower : 28000 msl bound upper : 28000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zab tower : hsv
Operator	other
Make Model Name	Military Trainer
Flight Phase	cruise other
Route In Use	enroute airway : j2
Flight Plan	IFR
Person 1
Affiliation	government : military
Function	flight crew : captain oversight : pic
Qualification	pilot : military pilot : atp
Experience	flight time last 90 days : 30 flight time total : 3500 flight time type : 2500
ASRS Report	193509
Person 2
Affiliation	government : military
Function	flight crew : first officer instruction : trainee
Qualification	pilot : military
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
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:

Crossing gbn aircraft was transitioned to J2 outbound heading of 247 degree. As the turn was made over gbn aircraft entered the core of a jet stream. Heading 5 degree right of 247 degree or 252 degree was initially selected to compensate for wind at 110 KTS from 310 degree. Before the TACAN needle could lock gbn due to the 'come of confusion' my aircraft was blown south of course. The needle finally locked on gbn at about 10 DME and showed us on the 237 degree radial or 10 degree left of J2. At the same moment center called us for an immediate right turn of 30 degree to get back to our jet route radial 247 degree. Military restr areas are located just south of J2. The only corrective action I can suggest is the addition of GPS navigation equipment on the MTR for a more accurate real time fix of aircraft position and the use of the INS for more accurate outbound tracking of radials when overhead a TACAN station, ie, with a spinning TACAN needle.

Original NASA ASRS Text

Title: MTR TRACK DEV AFTER ENCOUNTER WITH HIGH LEVEL JET STREAM OVER GBN.

Narrative: XING GBN ACFT WAS TRANSITIONED TO J2 OUTBOUND HDG OF 247 DEG. AS THE TURN WAS MADE OVER GBN ACFT ENTERED THE CORE OF A JET STREAM. HDG 5 DEG R OF 247 DEG OR 252 DEG WAS INITIALLY SELECTED TO COMPENSATE FOR WIND AT 110 KTS FROM 310 DEG. BEFORE THE TACAN NEEDLE COULD LOCK GBN DUE TO THE 'COME OF CONFUSION' MY ACFT WAS BLOWN S OF COURSE. THE NEEDLE FINALLY LOCKED ON GBN AT ABOUT 10 DME AND SHOWED US ON THE 237 DEG RADIAL OR 10 DEG L OF J2. AT THE SAME MOMENT CENTER CALLED US FOR AN IMMEDIATE R TURN OF 30 DEG TO GET BACK TO OUR JET RTE RADIAL 247 DEG. MIL RESTR AREAS ARE LOCATED JUST S OF J2. THE ONLY CORRECTIVE ACTION I CAN SUGGEST IS THE ADDITION OF GPS NAV EQUIP ON THE MTR FOR A MORE ACCURATE REAL TIME FIX OF ACFT POS AND THE USE OF THE INS FOR MORE ACCURATE OUTBOUND TRACKING OF RADIALS WHEN OVERHEAD A TACAN STATION, IE, WITH A SPINNING TACAN NEEDLE.

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.