Near midair collision between a lear jet 35 turning final at a non controled airport and a helicopter transiting the area over a nearby major highway. No evasive action taken due to insufficient time after sighting the helicopter.

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Attributes
ACN	363938
Time
Date	199703
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : udd
State Reference	CA
Altitude	msl bound lower : 800 msl bound upper : 800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Learjet 35
Operating Under FAR Part	Part 135
Flight Phase	descent : approach other
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Make Model Name	Helicopter
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	other other : other pilot : atp
Experience	flight time last 90 days : 60 flight time total : 13500 flight time type : 11000
ASRS Report	363938
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 75 vertical : 50
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Cleared for visual approach to udd, runway 10, left traffic. Approached upwind, crosswind, downwind base, advising on 122.8 of our position. Just started turn to final and first officer yelled lookout, and helicopter passed 50-75 ft away underneath us. Major highway less than 100 yds away paralleling runway and is used as a VFR corridor through area.

Original NASA ASRS Text

Title: NMAC BTWN A LEAR JET 35 TURNING FINAL AT A NON CTLED ARPT AND A HELI TRANSITING THE AREA OVER A NEARBY MAJOR HWY. NO EVASIVE ACTION TAKEN DUE TO INSUFFICIENT TIME AFTER SIGHTING THE HELI.

Narrative: CLRED FOR VISUAL APCH TO UDD, RWY 10, L TFC. APCHED UPWIND, XWIND, DOWNWIND BASE, ADVISING ON 122.8 OF OUR POS. JUST STARTED TURN TO FINAL AND FO YELLED LOOKOUT, AND HELI PASSED 50-75 FT AWAY UNDERNEATH US. MAJOR HWY LESS THAN 100 YDS AWAY PARALLELING RWY AND IS USED AS A VFR CORRIDOR THROUGH AREA.

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.