<< >> NASA ASRS Report 623917, July 2004

ZOB controller experienced operational error with climbing and descending aircraft when altitude clearance was misspoken.

Attributes
ACN	623917
Time
Date	200407
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : mgw.vortac
State Reference	WV
Altitude	msl bound lower : 26000 msl bound upper : 27000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc
Operator	general aviation : corporate
Make Model Name	Citation X
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller military : 1 controller radar : 29 controller time certified in position1 : 12
ASRS Report	623917
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert
Resolutory Action	controller : issued alert controller : issued new clearance flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 16800 vertical : 300
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I believe I cleared my departure aircraft to FL260 as my data block indicated. For some unknown reason, I misspoke FL260 as FL280. The aircraft climbed to FL280 while deviating east for WX. The aircraft climbed through the altitude I believed I had assigned and was in conflict with descending traffic.

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Original NASA ASRS Text

Title: ZOB CTLR EXPERIENCED OPERROR WITH CLBING AND DSNDING ACFT WHEN ALT CLRNC WAS MISSPOKEN.

Narrative: I BELIEVE I CLRED MY DEP ACFT TO FL260 AS MY DATA BLOCK INDICATED. FOR SOME UNKNOWN REASON, I MISSPOKE FL260 AS FL280. THE ACFT CLBED TO FL280 WHILE DEVIATING E FOR WX. THE ACFT CLBED THROUGH THE ALT I BELIEVED I HAD ASSIGNED AND WAS IN CONFLICT WITH DSNDING TFC.

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.