Loss of separation due to controller's error.

Attributes
ACN	114183
Time
Date	198906
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : crl
State Reference	MI
Altitude	msl bound lower : 31000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time total : 17000 flight time type : 12000
ASRS Report	114183
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 225 flight time total : 4000 flight time type : 1500
ASRS Report	114484
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Controller: are you level 31,000'. Pilot: no we are level 33,000 (flight plan cruise 35,000). Controller: make right turn heading 350 degree from existing heading of 260 degree. Pilot: roger right turn 350 degree. Controller: right turn 350 descend immediately to 31,000'. Pilot: what happened. Controller: I made a mistake. To the best of my knowledge this was only a potential conflict.

Original NASA ASRS Text

Title: LOSS OF SEPARATION DUE TO CTLR'S ERROR.

Narrative: CTLR: ARE YOU LEVEL 31,000'. PLT: NO WE ARE LEVEL 33,000 (FLT PLAN CRUISE 35,000). CTLR: MAKE RIGHT TURN HDG 350 DEG FROM EXISTING HDG OF 260 DEG. PLT: ROGER RIGHT TURN 350 DEG. CTLR: RIGHT TURN 350 DSND IMMEDIATELY TO 31,000'. PLT: WHAT HAPPENED. CTLR: I MADE A MISTAKE. TO THE BEST OF MY KNOWLEDGE THIS WAS ONLY A POTENTIAL CONFLICT.

Data retrieved from NASA's ASRS site as of August 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.