First officer on super 80 is given a speed restr of 250 KTS by ATC. He activated 'speed select' versus 'altitude hold' on the flight guidance control panel. The aircraft descended 300 ft before descent was reversed. PIC was off frequency getting ATIS.

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Attributes
ACN	368019
Time
Date	199705
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : psp
State Reference	CA
Altitude	msl bound lower : 34700 msl bound upper : 35000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	368019
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	368020
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Location: psp. Center cleared us to slow to 250 KTS. First officer selected speed select instead of altitude hold. Captain was getting ATIS, didn't notice. Aircraft descended 300 ft and first officer corrected. Supplemental information from acn 368020: I then manually climbed back to FL350.

Original NASA ASRS Text

Title: FO ON SUPER 80 IS GIVEN A SPD RESTR OF 250 KTS BY ATC. HE ACTIVATED 'SPD SELECT' VERSUS 'ALT HOLD' ON THE FLT GUIDANCE CTL PANEL. THE ACFT DSNDED 300 FT BEFORE DSCNT WAS REVERSED. PIC WAS OFF FREQ GETTING ATIS.

Narrative: LOCATION: PSP. CTR CLRED US TO SLOW TO 250 KTS. FO SELECTED SPD SELECT INSTEAD OF ALT HOLD. CAPT WAS GETTING ATIS, DIDN'T NOTICE. ACFT DSNDED 300 FT AND FO CORRECTED. SUPPLEMENTAL INFO FROM ACN 368020: I THEN MANUALLY CLBED BACK TO FL350.

Data retrieved from NASA's ASRS site as of July 2007 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.