B737-800 flight crew reported descending below charted altitude on night visual approach to lax.

Narrative:

During the arrival/approach phase into lax while on an intercept heading to runway 06R I noticed our altitude was lower than where I wanted to be. We were in VMC conditions and cleared the visual to runway 06R and about to intercept the localizer and the glideslope from out over the ocean with the autopilot engaged and everything looking normal. I was still configuring and had planned a 30 flap landing and was at flaps 25 when I noticed that we were sinking below glideslope and the autopilot had not captured the glideslope. Since we were out over the water at night there were very few visual indications of our altitude. By the time I noticed it and started a correction; we were a few hundred feet below a 1000 feet. Because of our position on final; we decided to climb up and configure to 30 flaps and intercepted glide slope and were stabilized at 1000 feet. Because we were cleared the visual and able to get back to a stabilized approach at 1000 feet we elected to continue. Once the deviation was noticed; it was decided by both the captain and me that a go-around wasn't necessary since we were able to be on a stabilized approach at 1000 feet. The night before we had flown the all-nighter/red-eye to bos and this flight was also a relatively late arrival. The captain told me that he had also filed an as soon as possible report.

Original NASA ASRS Text

Title: B737-800 flight crew reported descending below charted altitude on night visual approach to LAX.

Narrative: During the arrival/approach phase into LAX while on an intercept heading to Runway 06R I noticed our altitude was lower than where I wanted to be. We were in VMC conditions and cleared the Visual to runway 06R and about to intercept the LOC and the glideslope from out over the ocean with the autopilot engaged and everything looking normal. I was still configuring and had planned a 30 flap landing and was at flaps 25 when I noticed that we were sinking below glideslope and the autopilot had not captured the glideslope. Since we were out over the water at night there were very few visual indications of our altitude. By the time I noticed it and started a correction; we were a few hundred feet below a 1000 feet. Because of our position on final; we decided to climb up and configure to 30 flaps and intercepted glide slope and were stabilized at 1000 feet. Because we were cleared the visual and able to get back to a stabilized approach at 1000 feet we elected to continue. Once the deviation was noticed; it was decided by both the Captain and me that a go-around wasn't necessary since we were able to be on a stabilized approach at 1000 feet. The night before we had flown the all-nighter/red-eye to BOS and this flight was also a relatively late arrival. The Captain told me that he had also filed an ASAP report.

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	1213465
Time
Date	201410
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	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Visual Approach
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 18000
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT