B737-800 encounters three helicopters on RNAV approach.

Attributes
ACN	795268
Time
Date	200807
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 2300
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : zzz.tracon tower : lax.tower
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Helicopter
Flight Phase	cruise : level
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 225 flight time type : 8000
ASRS Report	795268
Events
Anomaly	conflict : airborne less severe
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance Airport
Primary Problem	Ambiguous

Narrative:

While on approach we came within 600 ft of 3 helicopters operating VFR. We were executing rnp 26 approach to .15 minimums. First officer was flying and we encountered the helicopters at 2500-2000 ft. We were IMC; the helicopters were operating on rnp centerline at the bases of the clouds. They were not in contact with ZZZ tower. We did not receive an RA. We saw the helicopters visually as they passed under the nose. The landing was uneventful.

Original NASA ASRS Text

Title: B737-800 ENCOUNTERS THREE HELIS ON RNAV APCH.

Narrative: WHILE ON APCH WE CAME WITHIN 600 FT OF 3 HELIS OPERATING VFR. WE WERE EXECUTING RNP 26 APCH TO .15 MINIMUMS. FO WAS FLYING AND WE ENCOUNTERED THE HELIS AT 2500-2000 FT. WE WERE IMC; THE HELIS WERE OPERATING ON RNP CTRLINE AT THE BASES OF THE CLOUDS. THEY WERE NOT IN CONTACT WITH ZZZ TWR. WE DID NOT RECEIVE AN RA. WE SAW THE HELIS VISUALLY AS THEY PASSED UNDER THE NOSE. THE LNDG WAS UNEVENTFUL.

Data retrieved from NASA's ASRS site as of May 2009 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.