Potential conflict less than standard separation between 2 acrs in proximity of holding pattern. Descending traffic. Descent towards occupied altitude.

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Attributes
ACN	350665
Time
Date	199610
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : csn
State Reference	VA
Altitude	msl bound lower : 22800 msl bound upper : 23000
Environment
Flight Conditions	IMC
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 other
Route In Use	enroute : on vectors
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	other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10500 flight time type : 4000
ASRS Report	350665
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : atp
Experience	flight time last 90 days : 0 flight time total : 3200 flight time type : 0
ASRS Report	350900
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : published procedure non adherence : required legal separation other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	vertical : 800
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

While holding 15 mi west of casanova VOR at FL230 for WX at bwi, ATC informed us our expected further clearance time would be extended for another 30 mins. At this time, due to our fuel, we requested vectors to iad, our alternate. We were given heading 270 degrees and cleared to descend to FL190. By this time, we were 30 DME west of csn. The western holding pattern limit was 25 DME. Another airline flight holding at FL220 was no longer on our TCASII screen. At FL228 we received a TA, informed ATC, leveled off at FL230. ATC confirmed with other air carrier that they were in the pattern heading east on the 270 degree radial back towards csn VOR. We were then reclred to iad without incident. Because we were 30 DME west of csn and other air carrier was no longer on our TCASII screen, I believed we had adequate spacing. In the future, I'll ascertain the exact location before descending.

Original NASA ASRS Text

Title: POTENTIAL CONFLICT LTSS BTWN 2 ACRS IN PROX OF HOLDING PATTERN. DSNDING TFC. DSCNT TOWARDS OCCUPIED ALT.

Narrative: WHILE HOLDING 15 MI W OF CASANOVA VOR AT FL230 FOR WX AT BWI, ATC INFORMED US OUR EXPECTED FURTHER CLRNC TIME WOULD BE EXTENDED FOR ANOTHER 30 MINS. AT THIS TIME, DUE TO OUR FUEL, WE REQUESTED VECTORS TO IAD, OUR ALTERNATE. WE WERE GIVEN HDG 270 DEGS AND CLRED TO DSND TO FL190. BY THIS TIME, WE WERE 30 DME W OF CSN. THE WESTERN HOLDING PATTERN LIMIT WAS 25 DME. ANOTHER AIRLINE FLT HOLDING AT FL220 WAS NO LONGER ON OUR TCASII SCREEN. AT FL228 WE RECEIVED A TA, INFORMED ATC, LEVELED OFF AT FL230. ATC CONFIRMED WITH OTHER ACR THAT THEY WERE IN THE PATTERN HDG E ON THE 270 DEG RADIAL BACK TOWARDS CSN VOR. WE WERE THEN RECLRED TO IAD WITHOUT INCIDENT. BECAUSE WE WERE 30 DME W OF CSN AND OTHER ACR WAS NO LONGER ON OUR TCASII SCREEN, I BELIEVED WE HAD ADEQUATE SPACING. IN THE FUTURE, I'LL ASCERTAIN THE EXACT LOCATION BEFORE DSNDING.

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.