<< >> NASA ASRS Report 189593, September 1991

Altitude deviation altitude excursion creates potential conflict less than standard separation in departure arrival traffic situation.

Attributes
ACN	189593
Time
Date	199109
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	msl bound lower : 9580 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : commercial pilot : instrument
Experience	flight time last 90 days : 130 flight time total : 5000 flight time type : 400
ASRS Report	189593
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : far non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On gorman 9 departure off lax, controller cleared us to 9000 ft and 360 degree heading. Subsequent altitude clearance to 13000 ft. Approximately 9580 ft MSL controller issued clearance to maintain 9000 ft. Captain immediately disconnected automatic throttle and descended to 9000 ft. Looked to our 10 O'clock position and sighted a widebody transport aircraft presumed to be at 10000 ft. After talking with ATC facility, determined aircraft was other airline flight.

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Original NASA ASRS Text

Title: ALT DEV ALT EXCURSION CREATES POTENTIAL CONFLICT LTSS IN DEP ARR TFC SITUATION.

Narrative: ON GORMAN 9 DEP OFF LAX, CTLR CLRED US TO 9000 FT AND 360 DEG HDG. SUBSEQUENT ALT CLRNC TO 13000 FT. APPROX 9580 FT MSL CTLR ISSUED CLRNC TO MAINTAIN 9000 FT. CAPT IMMEDIATELY DISCONNECTED AUTO THROTTLE AND DSNDED TO 9000 FT. LOOKED TO OUR 10 O'CLOCK POS AND SIGHTED A WDB ACFT PRESUMED TO BE AT 10000 FT. AFTER TALKING WITH ATC FACILITY, DETERMINED ACFT WAS OTHER AIRLINE FLT.

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.