A321 flight crew reported noticing a runway incursion while they were taking off; however; they only...

Attributes
ACN	1524606
Time
Date	201803
Local Time Of Day	0001-0600
Place
Locale Reference	LAX.Airport
State Reference	CA
Environment
Light	Dawn
Aircraft 1
Make Model Name	A321
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Aircraft 2
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	ATC Issue All Types Conflict Ground Conflict Less Severe Ground Incursion Runway

Narrative:

We were cleared for takeoff on 24L; while still taxiing west on east. Shortly after taking the runway; increasing thrust; and performing a quick crosscheck of the engine instruments; I looked up and saw the runway status lights (rwsl) illuminate red momentarily. Before I could react; the lights went out. Assuming an aircraft had just crossed and cleared the runway; I elected to continue. Shortly after; we heard tower tell a company aircraft to stop. My first officer immediately told me he could see that the aircraft was stopped on taxiway Z.after takeoff; my first officer stated that it looked like the company aircraft may have in fact been across the holding line at taxiway Z and runway 24L (hot spot 2).what bothers me about this incident is why the rwsls did not stay illuminated if there was a threat. This is not my or my first officer's understanding of how they are supposed to work. We received no warning from the tower controller either.

Original NASA ASRS Text

Title: A321 flight crew reported noticing a runway incursion while they were taking off; however; they only received a momentary Runway Status Lights (RWSL) alert at the start of the roll.

Narrative: We were cleared for takeoff on 24L; while still taxiing west on E. Shortly after taking the runway; increasing thrust; and performing a quick crosscheck of the engine instruments; I looked up and saw the Runway Status Lights (RWSL) illuminate red momentarily. Before I could react; the lights went out. Assuming an aircraft had just crossed and cleared the runway; I elected to continue. Shortly after; we heard tower tell a company aircraft to STOP. My first officer immediately told me he could see that the aircraft was stopped on taxiway Z.After takeoff; my first officer stated that it looked like the company aircraft may have in fact been across the holding line at taxiway Z and runway 24L (hot spot 2).What bothers me about this incident is why the RWSLs did not stay illuminated if there was a threat. This is not my or my First Officer's understanding of how they are supposed to work. We received no warning from the Tower Controller either.

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.

A321 flight crew reported noticing a runway incursion while they were taking off; however; they only received a momentary runway status lights (rwsl) alert at the start of the roll.