Air carrier large transport PIC does not follow taxi route as given by ground controller in an attempt to get around a B747-400 being towed by air carrier maintenance personnel.

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Attributes
ACN	362390
Time
Date	199702
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dtw
State Reference	MI
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : frg
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground other : taxi
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B747-400
Operating Under FAR Part	other : other
Navigation In Use	Other Other
Flight Phase	other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 120 flight time total : 10000 flight time type : 45
ASRS Report	362390
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 210 flight time total : 9500 flight time type : 900
ASRS Report	361819
Events
Anomaly	non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Cleared by ATC 121.8 at dtw from circle 4, 'air carrier X join taxiway Y via K13 taxi to runway 21R hold short of K15.' while on taxiway Y abeam K14, ground instructed us to go behind a B747-400 under maintenance tow. The B747-400 was being towed on taxiway Y heading 215 degrees abeam Y16. After clearing (visually) the txwys, the captain turned off taxiway Y onto K15 then 035 degrees on K holding behind traffic short of K16. Ground then chastised us for turning to go around the B747-400/behind the B747 so we could taxi to runway 21R. Supplemental information from acn 361819: while first officer was programming FMS, captain thought he heard ground direct us to taxi onto taxiway Y then back to taxiway K via K15. When we returned to taxiway K, ground control expressed some degree of surprise. Apparently he wanted us to remain on taxiway Y. Next time I will insist that ground control repeat his instruction so that both the first officer and I agree to what the proper taxi instructions are.

Original NASA ASRS Text

Title: ACR LGT PIC DOES NOT FOLLOW TAXI RTE AS GIVEN BY GND CTLR IN AN ATTEMPT TO GET AROUND A B747-400 BEING TOWED BY ACR MAINT PERSONNEL.

Narrative: CLRED BY ATC 121.8 AT DTW FROM CIRCLE 4, 'ACR X JOIN TXWY Y VIA K13 TAXI TO RWY 21R HOLD SHORT OF K15.' WHILE ON TXWY Y ABEAM K14, GND INSTRUCTED US TO GO BEHIND A B747-400 UNDER MAINT TOW. THE B747-400 WAS BEING TOWED ON TXWY Y HDG 215 DEGS ABEAM Y16. AFTER CLRING (VISUALLY) THE TXWYS, THE CAPT TURNED OFF TXWY Y ONTO K15 THEN 035 DEGS ON K HOLDING BEHIND TFC SHORT OF K16. GND THEN CHASTISED US FOR TURNING TO GO AROUND THE B747-400/BEHIND THE B747 SO WE COULD TAXI TO RWY 21R. SUPPLEMENTAL INFO FROM ACN 361819: WHILE FO WAS PROGRAMMING FMS, CAPT THOUGHT HE HEARD GND DIRECT US TO TAXI ONTO TXWY Y THEN BACK TO TXWY K VIA K15. WHEN WE RETURNED TO TXWY K, GND CTL EXPRESSED SOME DEG OF SURPRISE. APPARENTLY HE WANTED US TO REMAIN ON TXWY Y. NEXT TIME I WILL INSIST THAT GND CTL REPEAT HIS INSTRUCTION SO THAT BOTH THE FO AND I AGREE TO WHAT THE PROPER TAXI INSTRUCTIONS ARE.

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.