Aircraft climbed through assigned altitude.

Attributes
ACN	146980
Time
Date	199005
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bax
State Reference	MI
Altitude	msl bound lower : 18600 msl bound upper : 19000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Medium Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	146980
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 30000 vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Aircraft was cleared to FL180 (requested altitude FL200). Pilot read back FL180. Aircraft climbed through FL180. As soon as I saw FL183 on mode C, I descended and turned the mdt. A second aircraft was at 12 O'clock and 7 mi, southbound (head-on) at FL190. 90 degree turns on both aircraft resulted in 5 mi latitude sep and 300-400' vertical. The mdt pilot said he was cleared to FL200 when I questioned him. Tapes have not been pulled, but pilot was asked to call ZOB quality assurance office (SOP). Since snitch did not go off, this is only being treated as a pilot deviation. Ps: highest mode C was 18600.

Original NASA ASRS Text

Title: ACFT CLIMBED THROUGH ASSIGNED ALT.

Narrative: ACFT WAS CLRED TO FL180 (REQUESTED ALT FL200). PLT READ BACK FL180. ACFT CLBED THROUGH FL180. AS SOON AS I SAW FL183 ON MODE C, I DSNDED AND TURNED THE MDT. A SECOND ACFT WAS AT 12 O'CLOCK AND 7 MI, SBND (HEAD-ON) AT FL190. 90 DEG TURNS ON BOTH ACFT RESULTED IN 5 MI LAT SEP AND 300-400' VERT. THE MDT PLT SAID HE WAS CLRED TO FL200 WHEN I QUESTIONED HIM. TAPES HAVE NOT BEEN PULLED, BUT PLT WAS ASKED TO CALL ZOB QUALITY ASSURANCE OFFICE (SOP). SINCE SNITCH DID NOT GO OFF, THIS IS ONLY BEING TREATED AS A PLT DEVIATION. PS: HIGHEST MODE C WAS 18600.

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.