B777 crew had taxiway incursion at egtt.

Attributes
ACN	475733
Time
Date	200006
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : egll.airport
State Reference	FO
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 14000 flight time type : 2500
ASRS Report	475733
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp pilot : multi engine
Experience	flight time last 90 days : 170 flight time total : 10000 flight time type : 250
ASRS Report	475240
Events
Anomaly	incursion : taxiway non adherence : clearance non adherence : published procedure other anomaly other
Independent Detector	other controllera
Resolutory Action	other
Supplementary
Problem Areas	Airport Flight Crew Human Performance Chart Or Publication
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After arrival in lhr (B777) gate was occupied. Ground taxied us to a very unusual hold area and held until our gate was available. A B747-400 was taxied in front of us to cross runway 27L and ground cleared us to the gate via the inner taxiway. However the gate is not to be used by B777 and B747 due to lack of wingtip clearance (but these aircraft under tow is okay)? I glanced at my gate taxi chart but it did not show this restr on that may like on the 10-9 taxi chart. I glanced ahead of the aircraft and it looked like it would 'fit.' my overzealous confidence having been to lhr so often I advised the captain we could taxi here. I was questioning myself a little...the ground controller told us to 'stop.' an operations vehicle was called out to look at the problem and he led us out of there in seconds. (Personally it did not appear to be close at all to me, however it is in a turn at gate area and safety margins may be reduced.) my arrogance was at fault. The gate chart had the txwys but not restrs. The B747 taxiing in front of us led us to believe we should taxi now on the inner. No bent metal, no stressed concrete, no delays, just a blow to the old ego.

Original NASA ASRS Text

Title: B777 CREW HAD TXWY INCURSION AT EGTT.

Narrative: AFTER ARR IN LHR (B777) GATE WAS OCCUPIED. GND TAXIED US TO A VERY UNUSUAL HOLD AREA AND HELD UNTIL OUR GATE WAS AVAILABLE. A B747-400 WAS TAXIED IN FRONT OF US TO CROSS RWY 27L AND GND CLRED US TO THE GATE VIA THE INNER TXWY. HOWEVER THE GATE IS NOT TO BE USED BY B777 AND B747 DUE TO LACK OF WINGTIP CLRNC (BUT THESE ACFT UNDER TOW IS OKAY)? I GLANCED AT MY GATE TAXI CHART BUT IT DID NOT SHOW THIS RESTR ON THAT MAY LIKE ON THE 10-9 TAXI CHART. I GLANCED AHEAD OF THE ACFT AND IT LOOKED LIKE IT WOULD 'FIT.' MY OVERZEALOUS CONFIDENCE HAVING BEEN TO LHR SO OFTEN I ADVISED THE CAPT WE COULD TAXI HERE. I WAS QUESTIONING MYSELF A LITTLE...THE GND CTLR TOLD US TO 'STOP.' AN OPS VEHICLE WAS CALLED OUT TO LOOK AT THE PROB AND HE LED US OUT OF THERE IN SECONDS. (PERSONALLY IT DID NOT APPEAR TO BE CLOSE AT ALL TO ME, HOWEVER IT IS IN A TURN AT GATE AREA AND SAFETY MARGINS MAY BE REDUCED.) MY ARROGANCE WAS AT FAULT. THE GATE CHART HAD THE TXWYS BUT NOT RESTRS. THE B747 TAXIING IN FRONT OF US LED US TO BELIEVE WE SHOULD TAXI NOW ON THE INNER. NO BENT METAL, NO STRESSED CONCRETE, NO DELAYS, JUST A BLOW TO THE OLD EGO.

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.