An air taxiing helicopter came very close to the wingtip of a ground holding air carrier mdt.

Attributes
ACN	248598
Time
Date	199308
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dca
State Reference	DC
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : msp
Operator	common carrier : air carrier
Make Model Name	Medium Transport
Flight Phase	ground : holding
Flight Plan	IFR
Aircraft 2
Make Model Name	Helicopter
Flight Phase	ground other : taxi
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 10000 flight time type : 2500
ASRS Report	248598
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : ground critical conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 20
Supplementary
Primary Problem	Airport
Air Traffic Incident	Pilot Deviation
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

While parked, holding short of departure runway 3, dca airport, a helicopter approached, hovered in front, then air-taxied by us. Problem: the separation between our right wingtip and his rotating blades as he flew by was only about 20 ft. Ground control was made aware of this situation (helicopter approaching to land and air taxi on our narrow taxiway) but did not provide separation. The chopper pilot did not have to fly by us as close as he did. We were parked and helpless as he put us and our passenger at risk.

Original NASA ASRS Text

Title: AN AIR TAXIING HELI CAME VERY CLOSE TO THE WINGTIP OF A GND HOLDING ACR MDT.

Narrative: WHILE PARKED, HOLDING SHORT OF DEP RWY 3, DCA ARPT, A HELI APCHED, HOVERED IN FRONT, THEN AIR-TAXIED BY US. PROB: THE SEPARATION BTWN OUR R WINGTIP AND HIS ROTATING BLADES AS HE FLEW BY WAS ONLY ABOUT 20 FT. GND CTL WAS MADE AWARE OF THIS SIT (HELI APCHING TO LAND AND AIR TAXI ON OUR NARROW TXWY) BUT DID NOT PROVIDE SEPARATION. THE CHOPPER PLT DID NOT HAVE TO FLY BY US AS CLOSE AS HE DID. WE WERE PARKED AND HELPLESS AS HE PUT US AND OUR PAX AT RISK.

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.