Air carrier B737 flight crew acknowledged for frequency change, but keyed up incorrect frequency and missed timely altitude descent.

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Attributes
ACN	409370
Time
Date	199807
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mip
State Reference	PA
Altitude	msl bound lower : 18000 msl bound upper : 18000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny tower : stl
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 130 flight time total : 7730 flight time type : 1150
ASRS Report	409370
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

(Communication problem when changing frequency.) the new frequency was read back, but it was not corrected and ended up to be the wrong one. This resulted in missing a descent and we came out of the sequence. If the wrong frequency was caught on the readback, this would not have happened.

Original NASA ASRS Text

Title: ACR B737 FLC ACKNOWLEDGED FOR FREQ CHANGE, BUT KEYED UP INCORRECT FREQ AND MISSED TIMELY ALT DSCNT.

Narrative: (COM PROB WHEN CHANGING FREQ.) THE NEW FREQ WAS READ BACK, BUT IT WAS NOT CORRECTED AND ENDED UP TO BE THE WRONG ONE. THIS RESULTED IN MISSING A DSCNT AND WE CAME OUT OF THE SEQUENCE. IF THE WRONG FREQ WAS CAUGHT ON THE READBACK, THIS WOULD NOT HAVE HAPPENED.

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.