Close proximity two GA small aircraft aircraft in traffic pattern at lgb.

Attributes
ACN	149938
Time
Date	199006
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lgb
State Reference	CA
Altitude	agl bound lower : 800 agl bound upper : 800
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : lgb
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	other
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : initial
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 25 flight time total : 300 flight time type : 175
ASRS Report	149938
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 20 vertical : 10
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

I was cleared by the tower to takeoff and remain in the pattern. During climb out, another aircraft small aircraft Y was cleared by the tower to do a 90 degree left crosswind departure by the tower, which is nonstandard for the airport. It was at night and visibility was 15 mi plus. The other aircraft must have done its left 90 degree left turn just after leaving departure end of runway. We almost collided after I had started my crosswind turn (left). He banked steeply right and I left. We were so close that I passed through his wake and it upset the aircraft. Even though I scanned continually for other traffic, I did not see him. After the incident, he asked the tower about the other aircraft that he came close to (me), and the tower replied something to the effect that the other aircraft was supposed to have positive contact (visibility) with my aircraft before proceeding with the 90 degree left turn, implying that it was the other aircraft's fault.

Original NASA ASRS Text

Title: CLOSE PROX TWO GA SMA ACFT IN TRAFFIC PATTERN AT LGB.

Narrative: I WAS CLRED BY THE TWR TO TKOF AND REMAIN IN THE PATTERN. DURING CLBOUT, ANOTHER ACFT SMA Y WAS CLRED BY THE TWR TO DO A 90 DEG L XWIND DEP BY THE TWR, WHICH IS NONSTANDARD FOR THE ARPT. IT WAS AT NIGHT AND VISIBILITY WAS 15 MI PLUS. THE OTHER ACFT MUST HAVE DONE ITS L 90 DEG L TURN JUST AFTER LEAVING DEP END OF RWY. WE ALMOST COLLIDED AFTER I HAD STARTED MY XWIND TURN (L). HE BANKED STEEPLY R AND I LEFT. WE WERE SO CLOSE THAT I PASSED THROUGH HIS WAKE AND IT UPSET THE ACFT. EVEN THOUGH I SCANNED CONTINUALLY FOR OTHER TFC, I DID NOT SEE HIM. AFTER THE INCIDENT, HE ASKED THE TWR ABOUT THE OTHER ACFT THAT HE CAME CLOSE TO (ME), AND THE TWR REPLIED SOMETHING TO THE EFFECT THAT THE OTHER ACFT WAS SUPPOSED TO HAVE POSITIVE CONTACT (VIS) WITH MY ACFT BEFORE PROCEEDING WITH THE 90 DEG L TURN, IMPLYING THAT IT WAS THE OTHER ACFT'S FAULT.

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.