MD11 departure from anc questioned controller's clearance to cross hold lines for runway 25L but not taxi on to the runway; landing traffic on runway 25L.

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Attributes
ACN	745309
Time
Date	200707
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : anc.airport
State Reference	AK
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : anc.tower tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Flight Phase	ground : holding
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : anc.tower
Make Model Name	Small Aircraft
Flight Phase	descent : approach
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 40 flight time total : 5000 flight time type : 900
ASRS Report	745309
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

Cleared to taxi to hold short of runway 25R on taxiway C at anc. Then cleared to cross runway 25R and hold short of runway 25L on taxiway C. I taxied the airplane up to the hold short line for runway 25L. The hold short markings between runways 25R and 25L are very close together; too close to fit an MD11 between them. After about a minute; anc tower advised 'air carrier X move up a little for landing traffic on runway 25R.' my first officer asked; 'are we cleared on to hold?' tower replied; 'no; just move up some; it's ok if you cross the hold short line; just don't take the runway yet.' tower then cleared a small single engine airplane to land long on runway 25R (past our jet wash). Once the single engine aircraft landed on runway 25R; anc tower cleared us for takeoff on runway 25L. At no time did we feel in danger; just uncomfortable with the clearance. I'm not sure if I need to file an event report about a runway incursion because we were under tower control during the entire event.

Original NASA ASRS Text

Title: MD11 DEP FROM ANC QUESTIONED CTLR'S CLRNC TO CROSS HOLD LINES FOR RWY 25L BUT NOT TAXI ON TO THE RWY; LNDG TFC ON RWY 25L.

Narrative: CLRED TO TAXI TO HOLD SHORT OF RWY 25R ON TXWY C AT ANC. THEN CLRED TO CROSS RWY 25R AND HOLD SHORT OF RWY 25L ON TXWY C. I TAXIED THE AIRPLANE UP TO THE HOLD SHORT LINE FOR RWY 25L. THE HOLD SHORT MARKINGS BTWN RWYS 25R AND 25L ARE VERY CLOSE TOGETHER; TOO CLOSE TO FIT AN MD11 BTWN THEM. AFTER ABOUT A MINUTE; ANC TWR ADVISED 'ACR X MOVE UP A LITTLE FOR LNDG TFC ON RWY 25R.' MY FO ASKED; 'ARE WE CLRED ON TO HOLD?' TWR REPLIED; 'NO; JUST MOVE UP SOME; IT'S OK IF YOU CROSS THE HOLD SHORT LINE; JUST DON'T TAKE THE RWY YET.' TWR THEN CLRED A SMALL SINGLE ENG AIRPLANE TO LAND LONG ON RWY 25R (PAST OUR JET WASH). ONCE THE SINGLE ENG ACFT LANDED ON RWY 25R; ANC TWR CLRED US FOR TKOF ON RWY 25L. AT NO TIME DID WE FEEL IN DANGER; JUST UNCOMFORTABLE WITH THE CLRNC. I'M NOT SURE IF I NEED TO FILE AN EVENT RPT ABOUT A RWY INCURSION BECAUSE WE WERE UNDER TWR CTL DURING THE ENTIRE EVENT.

Data retrieved from NASA's ASRS site as of January 2009 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.