Pilots report of taxiing to a runway but crossing a closed runway in the process at lax.

Narrative:

Departing lax; runway 24L; which is the primary runway for departures is closed due to construction. We were given instructions to taxi to runway 24R. Our instructions were to taxi via the concrete pad to 24R. That's it. We were never given instruction to hold short of anything or even monitor another frequency for further instruction. We taxied across 24L; which is closed for construction and I switched us to tower frequency. Tower then asked us if we were on frequency and then advised us we needed permission to cross runway 24L. With the airport in an irregular operation; having a runway closed; the instruction we received from ground control was not as clear as it could have been. The construction was the biggest threat we faced. As well as what we later thought was incomplete instruction from ATC. After discussing the situation later; we both felt that the ground controller should have given more precise instructions; given the construction and irregular operations on the field. If the ground controller had specified to either hold short or stay with him for further instruction or even switch to tower for crossing; the whole situation would have been avoided. Instead we incorrectly taxied with what we thought we had clearance to do. That was taxi to 24R via the concrete pad. That is what we did.

Original NASA ASRS Text

Title: Pilots report of taxiing to a runway but crossing a closed runway in the process at LAX.

Narrative: Departing LAX; Runway 24L; which is the primary runway for departures is closed due to construction. We were given instructions to taxi to Runway 24R. Our instructions were to taxi via the concrete pad to 24R. That's it. We were never given instruction to hold short of anything or even monitor another frequency for further instruction. We taxied across 24L; which is closed for construction and I switched us to Tower frequency. Tower then asked us if we were on frequency and then advised us we needed permission to cross Runway 24L. With the airport in an irregular operation; having a runway closed; the instruction we received from Ground Control was not as clear as it could have been. The construction was the biggest threat we faced. As well as what we later thought was incomplete instruction from ATC. After discussing the situation later; we both felt that the Ground Controller should have given more precise instructions; given the construction and irregular operations on the field. If the Ground Controller had specified to either hold short or stay with him for further instruction or even switch to Tower for crossing; the whole situation would have been avoided. Instead we incorrectly taxied with what we thought we had clearance to do. That was taxi to 24R via the concrete pad. That is what we did.

Data retrieved from NASA's ASRS site 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	1176821
Time
Date	201405
Local Time Of Day	0601-1200
Place
Locale Reference	LAX.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	First Officer
Experience	Flight Crew Last 90 Days 234 Flight Crew Type 2400
Person 2
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 243 Flight Crew Type 12000
Events
Anomaly	ATC Issue All Types Deviation - Procedural Clearance Ground Incursion Runway