A B737-700 crew expected the lax runway 24R seavu two but later were cleared for runway 25L. After t...

Attributes
ACN	852987
Time
Date	200909
Local Time Of Day	1801-2400
Place
Locale Reference	LAX.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR SEAVU2
Flight Plan	IFR
Person 1
Function	First Officer
Experience	Flight Crew Last 90 Days 248 Flight Crew Type 248
Events
Anomaly	Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy

Narrative:

During descent to lax on the seavu two arrival; due to a runway change as we approached konzl (17;000 ft / 280 KIAS); we were several hundred feet high. We were expecting runway 24R and then changed to runway 25L. I was the pilot flying and I had; previously; changed the speeds on the descent page to cross konzl at 280 KIAS. After the runway change; I suspect the descent speed reverted back to 261 KIAS. This caused the autopilot to command a level off to slow from 280 KIAS to 261 KIAS. We were on the proper descent profile; but with the level off about 3 NM from konzl; by the time we assessed the situation; it was too late to push over at a reasonable rate. We ended up crossing konzl at about 17;400 ft and 270 KIAS. The rest of the approach and landing were uneventful.

Original NASA ASRS Text

Title: A B737-700 crew expected the LAX Runway 24R SEAVU TWO but later were cleared for Runway 25L. After the FMC programming change the 280 KT KONZL crossing speed dropped out; unseen by the crew; causing the aircraft to slow and cross KONZL 400 FT high.

Narrative: During descent to LAX on the SEAVU TWO Arrival; due to a runway change as we approached KONZL (17;000 FT / 280 KIAS); we were several hundred feet high. We were expecting Runway 24R and then changed to Runway 25L. I was the pilot flying and I had; previously; changed the speeds on the descent page to cross KONZL at 280 KIAS. After the runway change; I suspect the descent speed reverted back to 261 KIAS. This caused the autopilot to command a level off to slow from 280 KIAS to 261 KIAS. We were on the proper descent profile; but with the level off about 3 NM from KONZL; by the time we assessed the situation; it was too late to push over at a reasonable rate. We ended up crossing KONZL at about 17;400 FT and 270 KIAS. The rest of the approach and landing were uneventful.

Data retrieved from NASA's ASRS site as of April 2012 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.

A B737-700 crew expected the lax runway 24R seavu two but later were cleared for runway 25L. After the FMC programming change the 280 KT konzl crossing speed dropped out; unseen by the crew; causing the aircraft to slow and cross konzl 400 ft high.