ZID controller experienced operational deviation when issuing wrong altitude and then failing to hea...

Attributes
ACN	782527
Time
Date	200803
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : jpu.vortac
State Reference	WV
Altitude	msl single value : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : handoff position
Experience	controller radar : 17
ASRS Report	782527
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 100 flight time total : 15600 flight time type : 150
ASRS Report	781243
Events
Anomaly	non adherence : clearance
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation

Narrative:

Air carrier X was issued descent to FL300. Controller meant to say FL350. Supplemental information from acn 781243: during cruise at FL360; ARTCC issued clearance to FL300. Descending through FL340; ARTCC said our assigned altitude was FL350. I was informed via radio that a pilot deviation had occurred. A review of the audio tape showed that the clearance had indeed been to descend to FL300.

Original NASA ASRS Text

Title: ZID CTLR EXPERIENCED OPDEV WHEN ISSUING WRONG ALT AND THEN FAILING TO HEAR READBACK.

Narrative: ACR X WAS ISSUED DSCNT TO FL300. CTLR MEANT TO SAY FL350. SUPPLEMENTAL INFO FROM ACN 781243: DURING CRUISE AT FL360; ARTCC ISSUED CLRNC TO FL300. DSNDING THROUGH FL340; ARTCC SAID OUR ASSIGNED ALT WAS FL350. I WAS INFORMED VIA RADIO THAT A PLTDEV HAD OCCURRED. A REVIEW OF THE AUDIO TAPE SHOWED THAT THE CLRNC HAD INDEED BEEN TO DSND TO FL300.

Data retrieved from NASA's ASRS site as of May 2009 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.

ZID controller experienced operational deviation when issuing wrong altitude and then failing to hear readback.