<< >> NASA ASRS Report 467280, March 2000

First officer of a B737 overshot assigned altitude on descent resulting in conflict with a B757 climbing to the same altitude to which reporter was inadvertently descending.

Attributes
ACN	467280
Time
Date	200003
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : den.airport
State Reference	CO
Altitude	msl bound lower : 10600 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : d01.tracon
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : vacating altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : d01.tracon
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 9500 flight time type : 3000
ASRS Report	467280
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued alert flight crew : returned to assigned altitude
Miss Distance	horizontal : 18000 vertical : 1100
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Issued clearance to 11000 ft, I read back 'descend to 11000 ft, one, one thousand.' I set 10000 ft in the altitude window (I was the PNF). At 10600 ft the controller said 'if you are below 11000 ft, climb to 11000 ft, traffic below at 9500 ft climbing to 10000 ft.' I took the plane and climbed to 11000 ft.

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Original NASA ASRS Text

Title: FO OF A B737 OVERSHOT ASSIGNED ALT ON DSCNT RESULTING IN CONFLICT WITH A B757 CLBING TO THE SAME ALT TO WHICH RPTR WAS INADVERTENTLY DSNDING.

Narrative: ISSUED CLRNC TO 11000 FT, I READ BACK 'DSND TO 11000 FT, ONE, ONE THOUSAND.' I SET 10000 FT IN THE ALT WINDOW (I WAS THE PNF). AT 10600 FT THE CTLR SAID 'IF YOU ARE BELOW 11000 FT, CLB TO 11000 FT, TFC BELOW AT 9500 FT CLBING TO 10000 FT.' I TOOK THE PLANE AND CLBED TO 11000 FT.

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.