Loss of separation between B727 descending from FL260 to FL220 and a B737 at FL250.

Attributes
ACN	399370
Time
Date	199804
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : pxt
State Reference	MD
Altitude	msl bound lower : 25000 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 7
ASRS Report	399370
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	faa : investigated
Miss Distance	horizontal : 16200 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X descending from FL260 to FL220. Air carrier Y level at FL250. Air carrier X turned left, reclred to FL260 reports level at FL260. Air carrier Y has TCASII and climbs to FL265.

Original NASA ASRS Text

Title: LOSS OF SEPARATION BTWN B727 DSNDING FROM FL260 TO FL220 AND A B737 AT FL250.

Narrative: ACR X DSNDING FROM FL260 TO FL220. ACR Y LEVEL AT FL250. ACR X TURNED L, RECLRED TO FL260 RPTS LEVEL AT FL260. ACR Y HAS TCASII AND CLBS TO FL265.

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.