Sct approach control cleared flight crew for approach to lax runway 25L. Then advised that clearance...

Narrative:

PNF read back 25 left and switched mcdu to fly 25 left ILS transition after river. Approach advised that we should be on 24L around taroc at approx. 8500 feet. And issued vector to join 24 left procedure which we complied with immediately. I believe this was a readback / hearing mix-up. Could also have been an ATC error. I didn't specifically recollect hearing the change to 25left that the first officer read back. I try to make a habit of asking the PNF to query clearances if I don't hear them clearly. Very little traffic this particular evening and I just didn't catch it. No loss of separation and when advised to change to the 24 left path we complied immediately. In short... If you don't clearly here a clearance and your flying partner advises what he or she heard... That is always a good time to ask for a verification.

Original NASA ASRS Text

Title: SCT Approach control cleared flight crew for approach to LAX Runway 25L. Then advised that clearance was actually to Runway 24L and reissued the approach clearance.

Narrative: PNF read back 25 left and switched MCDU to fly 25 L ILS transition after River. Approach advised that we should be on 24L around TAROC at approx. 8500 feet. And issued vector to join 24 left procedure which we complied with immediately. I believe this was a readback / hearing mix-up. Could also have been an ATC error. I didn't specifically recollect hearing the change to 25left that the FO read back. I try to make a habit of asking the PNF to query clearances if I don't hear them clearly. Very little traffic this particular evening and I just didn't catch it. No loss of separation and when advised to change to the 24 left path we complied immediately. In short... If you don't clearly here a clearance and your flying partner advises what he or she heard... That is always a good time to ask for a verification.

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	1275599
Time
Date	201507
Local Time Of Day	0001-0600
Place
Locale Reference	LAX.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Medium Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	STAR RIIVR2
Flight Plan	IFR
Person 1
Function	Pilot Flying
Person 2
Function	Pilot Not Flying
Events
Anomaly	ATC Issue All Types Deviation - Procedural Clearance Deviation - Track / Heading All Types

Sct approach control cleared flight crew for approach to lax runway 25L. Then advised that clearance was actually to runway 24L and reissued the approach clearance.