ZME controller described a loss of separation event when an aircraft handed off to an adjacent secto...

Attributes
ACN	1011429
Time
Date	201205
Local Time Of Day	1801-2400
Place
Locale Reference	ZME.ARTCC
State Reference	TN
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Aircraft 2
Make Model Name	Citation V/Ultra/Encore (C560)
Operating Under FAR Part	Part 91
Flight Phase	Descent
Person 1
Function	Enroute
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Airspace Violation All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy

Narrative:

Leveled a B737 at FL220 and stopped a citation V at FL230. They were separated. Handed the citation V off to sector 60 and they descended the citation V down to eleven thousand right on top of my B737 without control. In response; I climbed my B737 to FL270 in order to avoid a mid air collision. Possibly evaluate and establish some procedures that may include a 'look and go' option that could enhance the current operation with minimum coordination. All too often; sectors in close proximity rely on verbal confirmation to a request; but do not have anything concrete or an established procedure in an SOP.

Original NASA ASRS Text

Title: ZME Controller described a loss of separation event when an aircraft handed off to an adjacent sector was descended without coordination; the reporter suggesting some type of 'Look and Go' coordination procedure be established.

Narrative: Leveled a B737 at FL220 and stopped a Citation V at FL230. They were separated. Handed the Citation V off to Sector 60 and they descended the Citation V down to eleven thousand right on top of my B737 without control. In response; I climbed my B737 to FL270 in order to avoid a mid air collision. Possibly evaluate and establish some procedures that may include a 'Look and Go' option that could enhance the current operation with minimum coordination. All too often; Sectors in close proximity rely on verbal confirmation to a request; but do not have anything concrete or an established procedure in an SOP.

Data retrieved from NASA's ASRS site as of July 2013 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.

ZME controller described a loss of separation event when an aircraft handed off to an adjacent sector was descended without coordination; the reporter suggesting some type of 'look and go' coordination procedure be established.