<< >> NASA ASRS Report 347678, September 1996

Departure controller claims that 5 commuter aircraft were released in trail with several aircraft closer than required separation.

Attributes
ACN	347678
Time
Date	199609
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax tower : lax artcc : czyz
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Operating Under FAR Part	Part 135
Flight Phase	climbout : initial
Route In Use	departure other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Jetstream 31
Operating Under FAR Part	Part 135
Flight Phase	climbout : initial
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller military : 3 controller radar : 13
ASRS Report	347678
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Lax tower departed 5 turboprop commuters within 2 mins on the same heading, climbing to the same altitude. Aircraft #3 was maintaining visual separation from aircraft #2, but not #1. Aircraft #5 was told to maintain visual separation from #4 but not #3. #5 did not see #3, and was on the same assigned heading, less than 3 mi.

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Original NASA ASRS Text

Title: DEP CTLR CLAIMS THAT 5 COMMUTER ACFT WERE RELEASED IN TRAIL WITH SEVERAL ACFT CLOSER THAN REQUIRED SEPARATION.

Narrative: LAX TWR DEPARTED 5 TURBOPROP COMMUTERS WITHIN 2 MINS ON THE SAME HEADING, CLBING TO THE SAME ALT. ACFT #3 WAS MAINTAINING VISUAL SEPARATION FROM ACFT #2, BUT NOT #1. ACFT #5 WAS TOLD TO MAINTAIN VISUAL SEPARATION FROM #4 BUT NOT #3. #5 DID NOT SEE #3, AND WAS ON THE SAME ASSIGNED HEADING, LESS THAN 3 MI.

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.