<< >> NASA ASRS Report 509390, April 2001

Approach controller misses the incorrect readback as an air carrier heavy jet flight crew descends through an assigned altitude of 11000 ft believing they were assigned 10000 ft at den, co.

Attributes
ACN	509390
Time
Date	200104
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : den.airport
State Reference	CO
Altitude	msl bound lower : 10500 msl bound upper : 11000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	controller : developmental pilot : atp pilot : instrument pilot : commercial pilot : multi engine
Experience	controller non radar : 0.75 flight time last 90 days : 200 flight time total : 15000 flight time type : 200
ASRS Report	509390
Events
Anomaly	altitude deviation : overshoot altitude deviation : excursion from assigned altitude inflight encounter : turbulence non adherence : clearance other anomaly other
Resolutory Action	controller : issued new clearance controller : issued alert
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance Airspace Structure Weather
Primary Problem	ATC Human Performance

Narrative:

Descending through 10500 ft, approach told us to maintain 11000 ft. I told approach that we had read back 10000 ft and they said they missed our readback and to maintain 10500 ft. I believe approach cleared us out of 13000 ft after we advised of moderate chop and advised us it smoothed out at 10000 ft. Both pilots confirmed 10000 ft verbally, and pointed to the altitude window. Moderate turbulence, first officer's choice of not using autoflt, and neither pilot having flown into denver recently contributed.

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Original NASA ASRS Text

Title: APCH CTLR MISSES THE INCORRECT READBACK AS AN ACR HVY JET FLT CREW DSNDS THROUGH AN ASSIGNED ALT OF 11000 FT BELIEVING THEY WERE ASSIGNED 10000 FT AT DEN, CO.

Narrative: DSNDING THROUGH 10500 FT, APCH TOLD US TO MAINTAIN 11000 FT. I TOLD APCH THAT WE HAD READ BACK 10000 FT AND THEY SAID THEY MISSED OUR READBACK AND TO MAINTAIN 10500 FT. I BELIEVE APCH CLRED US OUT OF 13000 FT AFTER WE ADVISED OF MODERATE CHOP AND ADVISED US IT SMOOTHED OUT AT 10000 FT. BOTH PLTS CONFIRMED 10000 FT VERBALLY, AND POINTED TO THE ALT WINDOW. MODERATE TURB, FO'S CHOICE OF NOT USING AUTOFLT, AND NEITHER PLT HAVING FLOWN INTO DENVER RECENTLY CONTRIBUTED.

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.