Conflict alert activated, air carrier X issued immediate descent during climb to assigned altitude.

Attributes
ACN	149889
Time
Date	199007
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : hvq
State Reference	WV
Altitude	msl bound lower : 27000 msl bound upper : 28000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zid tower : dfw
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : intermediate altitude descent other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 13940 flight time type : 720
ASRS Report	149889
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	controller : issued new clearance other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure other

Narrative:

Received and acknowledged clearance to FL330. Approaching FL280 ordered by ATC to descend immediately to FL270--complied. Frequency immediately changed to next sector, then cleared to FL290 (had filed for FL330). ATC scc program manager on board. Company flight control advised. After landing dca, flight control advised altitude change was read due to controller proximity warning.

Original NASA ASRS Text

Title: CONFLICT ALERT ACTIVATED, ACR X ISSUED IMMEDIATE DESCENT DURING CLIMB TO ASSIGNED ALT.

Narrative: RECEIVED AND ACKNOWLEDGED CLRNC TO FL330. APCHING FL280 ORDERED BY ATC TO DSND IMMEDIATELY TO FL270--COMPLIED. FREQ IMMEDIATELY CHANGED TO NEXT SECTOR, THEN CLRED TO FL290 (HAD FILED FOR FL330). ATC SCC PROGRAM MGR ON BOARD. COMPANY FLT CTL ADVISED. AFTER LNDG DCA, FLT CTL ADVISED ALT CHANGE WAS READ DUE TO CTLR PROX WARNING.

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.