An air carrier crew failed to detect the cyyz runway '24L approach' sign and were advised by ATC aft...

Narrative:

Taxi out for takeoff on runway 24L. On tower frequency received clearance to cross 24R to hold short of approach of 24L. After crossing 24R and approximately 100 yards short of hold line for 24L we were told to stop. Tower controller then asked landing traffic on 24L if he was comfortable landing as an aircraft was inside the approach zone for 24L. The aircraft on a visual approach indicated that it was not a problem and landed. We then heard other aircraft on the frequency receiving a similar clearance to cross 24R and the controller then emphasized and added hold short of the '24L approach sign.' we did not recall hearing this clearance referring to the sign nor do we recall seeing a sign of this nature. No other comment was made and we were next for takeoff and departed without further incident. We reviewed all taxi charts prior to taxi out and after incident and could not find any reference to the 'approach sign.'

Original NASA ASRS Text

Title: An Air Carrier crew failed to detect the CYYZ Runway '24L Approach' sign and were advised by ATC after they crossed the hold line that they had a runway incursion.

Narrative: Taxi out for takeoff on Runway 24L. On Tower frequency received clearance to cross 24R to hold short of approach of 24L. After crossing 24R and approximately 100 yards short of hold line for 24L we were told to stop. Tower Controller then asked landing traffic on 24L if he was comfortable landing as an aircraft was inside the approach zone for 24L. The aircraft on a visual approach indicated that it was not a problem and landed. We then heard other aircraft on the frequency receiving a similar clearance to cross 24R and the Controller then emphasized and added hold short of the '24L approach sign.' We did not recall hearing this clearance referring to the sign nor do we recall seeing a sign of this nature. No other comment was made and we were next for takeoff and departed without further incident. We reviewed all taxi charts prior to taxi out and after incident and could not find any reference to the 'Approach Sign.'

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1022782
Time
Date	201207
Local Time Of Day	0001-0600
Place
Locale Reference	CYYZ.Airport
State Reference	ON
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Medium Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Conflict Ground Conflict Less Severe Deviation - Procedural Clearance Ground Event / Encounter Other / Unknown Ground Incursion Runway

An air carrier crew failed to detect the cyyz runway '24L approach' sign and were advised by ATC after they crossed the hold line that they had a runway incursion.