A ZDC radar controller descends a P3 through FL240 which is occupied by air carrier X over gve, va.

Attributes
ACN	458248
Time
Date	199912
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : gve.vor
State Reference	VA
Altitude	msl bound lower : 24000 msl bound upper : 25500
Environment
Flight Conditions	VMC
Weather Elements	Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zdc.artcc
Operator	other
Make Model Name	Orion (P3)
Navigation In Use	other vortac
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 6000 flight time type : 1200
ASRS Report	458248
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne critical inflight encounter : turbulence non adherence : far non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated faa : reviewed incident with flight crew
Miss Distance	horizontal : 200 vertical : 750
Supplementary
Problem Areas	Environmental Factor ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

At FL240, received a TCASII 'traffic, traffic,' a P3 showing +3, level flight. P3 began descent and we received an immediate 'climb, climb.' TCASII commanded 2500 FPM climb. We passed between 500-1000 ft above the offending aircraft and approximately 100-200 ft horizontal. We had limited visibility due to the sun directly in front of us. After calling ATC with TCASII climb, controller issued climb to FL250 but due to excessive climb rate we were unable to stop climb until FL255. We initiated immediate descent to FL250 and were again cleared to FL240. Supplemental information from acn 457914: air carrier X advised TCASII climb. Climbed above FL250 to avoid navy Y, a P3, who was descending out of FL250 to FL230. Controller thought air carrier X was at FL260.

Original NASA ASRS Text

Title: A ZDC RADAR CTLR DSNDS A P3 THROUGH FL240 WHICH IS OCCUPIED BY ACR X OVER GVE, VA.

Narrative: AT FL240, RECEIVED A TCASII 'TFC, TFC,' A P3 SHOWING +3, LEVEL FLT. P3 BEGAN DSCNT AND WE RECEIVED AN IMMEDIATE 'CLB, CLB.' TCASII COMMANDED 2500 FPM CLB. WE PASSED BTWN 500-1000 FT ABOVE THE OFFENDING ACFT AND APPROX 100-200 FT HORIZ. WE HAD LIMITED VISIBILITY DUE TO THE SUN DIRECTLY IN FRONT OF US. AFTER CALLING ATC WITH TCASII CLB, CTLR ISSUED CLB TO FL250 BUT DUE TO EXCESSIVE CLB RATE WE WERE UNABLE TO STOP CLB UNTIL FL255. WE INITIATED IMMEDIATE DSCNT TO FL250 AND WERE AGAIN CLRED TO FL240. SUPPLEMENTAL INFO FROM ACN 457914: ACR X ADVISED TCASII CLB. CLBED ABOVE FL250 TO AVOID NAVY Y, A P3, WHO WAS DSNDING OUT OF FL250 TO FL230. CTLR THOUGHT ACR X WAS AT FL260.

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.