B737 flight crew failed to notice loss of airspeed during climb. When airspeed decay was eventually noticed; corrective action was implemented and ATC was informed of deviation.

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Attributes
ACN	1068678
Time
Date	201302
Local Time Of Day	1801-2400
Place
Locale Reference	ZLA.ARTCC
State Reference	CA
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Person 1
Function	First Officer
Experience	Flight Crew Last 90 Days 179
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Speed All Types

Narrative:

While on climb-out at about 39;000 ft; I was filling out the logbook; looked up and noticed the airspeed was low. I informed the captain of the speed. He disconnected the autopilot and lowered nose to gain airspeed back.I informed ATC of our intentions. We descended 1;000 ft and regained normal airspeed. I believe the mode had changed in the FMS and we did not realize the change.

Original NASA ASRS Text

Title: B737 flight crew failed to notice loss of airspeed during climb. When airspeed decay was eventually noticed; corrective action was implemented and ATC was informed of deviation.

Narrative: While on climb-out at about 39;000 FT; I was filling out the logbook; looked up and noticed the airspeed was low. I informed the Captain of the speed. He disconnected the autopilot and lowered nose to gain airspeed back.I informed ATC of our intentions. We descended 1;000 FT and regained normal airspeed. I believe the mode had changed in the FMS and we did not realize the change.

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.