2 air carrier ltts had an near midair collision at a non tower airport CTAF.

Attributes
ACN	282937
Time
Date	199409
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sbp
State Reference	CA
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air carrier
Make Model Name	Jetstream 31
Operating Under FAR Part	Part 135
Flight Phase	cruise other descent : approach descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Metro Undifferentiated or Other Model
Operating Under FAR Part	Part 135
Flight Phase	descent : approach landing : go around
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 5100 flight time type : 1100
ASRS Report	282937
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac conflict : airborne less severe non adherence : published procedure other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

In summary: 2 light transport air carrier aircraft were launched from lax to sbp at night. The reporting aircraft was a few mins to the rear and had the lead aircraft in sight until nearing the sbp traffic pattern. Sbp is uncontrolled at the time of the air carrier's arrival. Nearing sbp, both aircraft were sent to the sbp CTAF, in turn, by ZLA. The reporting aircraft lost sight of the lead aircraft. The reporting aircraft planned a straight-in approach to runway 29 and assumed that the lead aircraft would do the same. The reporting aircraft made all of the proper traffic pattern calls. As they heard no replies from the lead aircraft, the reporting aircraft assumed that the lead aircraft was on the ground. Actually, the lead aircraft had not made a straight-in approach and was now behind the reporting aircraft and was forced to go around.

Original NASA ASRS Text

Title: 2 ACR LTTS HAD AN NMAC AT A NON TWR ARPT CTAF.

Narrative: IN SUMMARY: 2 LTT ACR ACFT WERE LAUNCHED FROM LAX TO SBP AT NIGHT. THE RPTING ACFT WAS A FEW MINS TO THE REAR AND HAD THE LEAD ACFT IN SIGHT UNTIL NEARING THE SBP TFC PATTERN. SBP IS UNCTLED AT THE TIME OF THE ACR'S ARR. NEARING SBP, BOTH ACFT WERE SENT TO THE SBP CTAF, IN TURN, BY ZLA. THE RPTING ACFT LOST SIGHT OF THE LEAD ACFT. THE RPTING ACFT PLANNED A STRAIGHT-IN APCH TO RWY 29 AND ASSUMED THAT THE LEAD ACFT WOULD DO THE SAME. THE RPTING ACFT MADE ALL OF THE PROPER TFC PATTERN CALLS. AS THEY HEARD NO REPLIES FROM THE LEAD ACFT, THE RPTING ACFT ASSUMED THAT THE LEAD ACFT WAS ON THE GND. ACTUALLY, THE LEAD ACFT HAD NOT MADE A STRAIGHT-IN APCH AND WAS NOW BEHIND THE RPTING ACFT AND WAS FORCED TO GAR.

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.