Near midair collision between a military helicopter transitioning through the class B airspace and an light transport inbound to the class B airport.

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Attributes
ACN	307687
Time
Date	199506
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : iad
State Reference	VA
Altitude	msl bound lower : 5500 msl bound upper : 5600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iad tower : iah
Operator	common carrier : air carrier
Make Model Name	Jetstream 41
Operating Under FAR Part	Part 135
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Iroquois 204 (Huey)
Operating Under FAR Part	other : other
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 70 flight time total : 16000 flight time type : 70
ASRS Report	307687
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 250
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

(Direct) on the localizer. Through 5600 ft huie 5500 ft eastbound. No transponder according to ATC. Increased aircraft rate of descent to avoid. Leveled at 5000 ft as per clearance. Conflicting (aircraft) was a weak primary target on ATC radar.

Original NASA ASRS Text

Title: NMAC BTWN A MIL HELI TRANSITIONING THROUGH THE CLASS B AIRSPACE AND AN LTT INBOUND TO THE CLASS B ARPT.

Narrative: (DIRECT) ON THE LOC. THROUGH 5600 FT HUIE 5500 FT EBOUND. NO XPONDER ACCORDING TO ATC. INCREASED ACFT RATE OF DSCNT TO AVOID. LEVELED AT 5000 FT AS PER CLRNC. CONFLICTING (ACFT) WAS A WEAK PRIMARY TARGET ON ATC RADAR.

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.