Flight crew of an air carrier large transport failed to follow clearance track during cruise due distraction of traffic watch for 3 military KC135's cruise at an altitude of 1000 ft above. ARTCC radar controller intervened and directed them back on course.

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Attributes
ACN	397857
Time
Date	199803
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mzv
State Reference	IL
Altitude	msl bound lower : 26000 msl bound upper : 26000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Stratotanker 135
Operating Under FAR Part	other : other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 14300 flight time type : 1500
ASRS Report	397857
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	non adherence : clearance other anomaly other 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:

ZAU had given us direct moline approximately 40-60 mi from moline. Turned to a heading at 15-20 mi from moline, traffic called out 1000 ft above us -- flight of 3 KC135's. Only one was showing on TCASII. As we were looking for aircraft, could see lead aircraft at 3-4 mi due to TCASII. Center questioned our position being 8 mi east of moline. DME showed 6 mi and decreasing. We turned to moline and back on course. More attention to navigation and not watching for aircraft.

Original NASA ASRS Text

Title: FLC OF AN ACR LGT FAILED TO FOLLOW CLRNC TRACK DURING CRUISE DUE DISTR OF TFC WATCH FOR 3 MIL KC135'S CRUISE AT AN ALT OF 1000 FT ABOVE. ARTCC RADAR CTLR INTERVENED AND DIRECTED THEM BACK ON COURSE.

Narrative: ZAU HAD GIVEN US DIRECT MOLINE APPROX 40-60 MI FROM MOLINE. TURNED TO A HEADING AT 15-20 MI FROM MOLINE, TFC CALLED OUT 1000 FT ABOVE US -- FLT OF 3 KC135'S. ONLY ONE WAS SHOWING ON TCASII. AS WE WERE LOOKING FOR ACFT, COULD SEE LEAD ACFT AT 3-4 MI DUE TO TCASII. CTR QUESTIONED OUR POS BEING 8 MI E OF MOLINE. DME SHOWED 6 MI AND DECREASING. WE TURNED TO MOLINE AND BACK ON COURSE. MORE ATTN TO NAV AND NOT WATCHING FOR ACFT.

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.