<< >> NASA ASRS Report 899973, July 2010

A B737-700 flight crew suffered and altitude excursion when they were cleared to descend to FL330 but entered 320 in the altitude alert window.

Attributes
ACN	899973
Time
Date	201007
Local Time Of Day	0601-1200
Place
Locale Reference	ZAU.ARTCC
State Reference	IL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	Autoflight System
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance

Narrative:

While at FL370 center issued a clearance to descend to FL330. First officer read back descend to FL320. While passing through FL340 changed to chicago center and first officer checked in saying passing FL340 for FL320. Simultaneously passing FL325 we got a TA and ATC queried us about our assigned altitude. We immediately turned the autopilot off and climbed to FL330.

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Original NASA ASRS Text

Title: A B737-700 flight crew suffered and altitude excursion when they were cleared to descend to FL330 but entered 320 in the altitude alert window.

Narrative: While at FL370 Center issued a clearance to descend to FL330. First Officer read back descend to FL320. While passing through FL340 changed to Chicago Center and First Officer checked in saying passing FL340 for FL320. Simultaneously passing FL325 we got a TA and ATC queried us about our assigned altitude. We immediately turned the autopilot off and climbed to FL330.

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.