B737 flight crew reports getting low on the riivr 2 arrival into lax when asked to slow. The MCP is switched from VNAV to level change and 250 set in the speed window to slow more rapidly and VNAV is not re-selected in a timely manor.

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Attributes
ACN	1112364
Time
Date	201308
Place
Locale Reference	LAX.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	MCP
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 14500 Flight Crew Type 9000
Person 2
Function	Pilot Flying First Officer
Experience	Flight Crew Last 90 Days 250 Flight Crew Total 4400 Flight Crew Type 1500
Events
Anomaly	Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Overshoot Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy

Narrative:

On the river arrival; ATC wanted us to slow from 250 KTS to 210 KTS. The fp used level change to slow down as sometimes VNAV does not slow down quickly. The VNAV was not reengaged and we got low on the arrival.

Original NASA ASRS Text

Title: B737 flight crew reports getting low on the RIIVR 2 arrival into LAX when asked to slow. The MCP is switched from VNAV to level change and 250 set in the speed window to slow more rapidly and VNAV is not re-selected in a timely manor.

Narrative: On the River Arrival; ATC wanted us to slow from 250 KTS to 210 KTS. The FP used Level Change to slow down as sometimes VNAV does not slow down quickly. The VNAV was not reengaged and we got low on the arrival.

Data retrieved from NASA's ASRS site as of July 2013 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.