Near midair collision.

Attributes
ACN	157087
Time
Date	199009
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : l75
State Reference	LA
Altitude	msl bound lower : 200 msl bound upper : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lch tower : dtw
Operator	general aviation : corporate
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Flight Phase	climbout : intermediate altitude climbout : initial
Route In Use	departure other
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 310 flight time total : 2700
ASRS Report	157087
Person 2
Affiliation	Other
Function	flight crew : single pilot
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

While on pipeline patrol I was passing through L75 traffic pattern 2 mi south of the airport. We had just terminated stage III service with lake charles approach and they advised us of departing traffic from L75 at 12 O'clock and 2 mi. We saw the traffic and were maintaining visibility sep. That aircraft was well clear. As we crossed extended centerline of runway 15 there was another small aircraft passing underneath our aircraft. I then saw traffic at 3:30-4 O'clock, approximately 800' off starboard side and would pass approximately 100' behind us at our 6 O'clock position. I then began to descend to 200' and turn away from the aircraft. I raised my wing to see his position and saw him diving and turning to follow me at my 6 O'clock position. We tried radio communication and received no reply. Then the aircraft turned and proceeded southbound. We left the area. I am familiar with the aircraft and their takeoff procedure at this airport. They depart in sequence and usually have 1-2 aircraft rolling on departure on the runway in trail, one behind the other, and have no more than 500-1000' sep between them. Frequently they make no radio traffic calls. I believe that proper departure procedures would lead to better safety and facility fewer events that could be fatal.

Original NASA ASRS Text

Title: NMAC.

Narrative: WHILE ON PIPELINE PATROL I WAS PASSING THROUGH L75 TFC PATTERN 2 MI S OF THE ARPT. WE HAD JUST TERMINATED STAGE III SVC WITH LAKE CHARLES APCH AND THEY ADVISED US OF DEPARTING TFC FROM L75 AT 12 O'CLOCK AND 2 MI. WE SAW THE TFC AND WERE MAINTAINING VIS SEP. THAT ACFT WAS WELL CLR. AS WE CROSSED EXTENDED CENTERLINE OF RWY 15 THERE WAS ANOTHER SMA PASSING UNDERNEATH OUR ACFT. I THEN SAW TFC AT 3:30-4 O'CLOCK, APPROX 800' OFF STARBOARD SIDE AND WOULD PASS APPROX 100' BEHIND US AT OUR 6 O'CLOCK POS. I THEN BEGAN TO DSND TO 200' AND TURN AWAY FROM THE ACFT. I RAISED MY WING TO SEE HIS POS AND SAW HIM DIVING AND TURNING TO FOLLOW ME AT MY 6 O'CLOCK POS. WE TRIED RADIO COM AND RECEIVED NO REPLY. THEN THE ACFT TURNED AND PROCEEDED SBND. WE LEFT THE AREA. I AM FAMILIAR WITH THE ACFT AND THEIR TKOF PROC AT THIS ARPT. THEY DEPART IN SEQUENCE AND USUALLY HAVE 1-2 ACFT ROLLING ON DEP ON THE RWY IN TRAIL, ONE BEHIND THE OTHER, AND HAVE NO MORE THAN 500-1000' SEP BTWN THEM. FREQUENTLY THEY MAKE NO RADIO TFC CALLS. I BELIEVE THAT PROPER DEP PROCS WOULD LEAD TO BETTER SAFETY AND FAC FEWER EVENTS THAT COULD BE FATAL.

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.