<< >> NASA ASRS Report 122823, September 1989

Track deviation.

Attributes
ACN	122823
Time
Date	198909
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sna
State Reference	CA
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sna
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : initial climbout : intermediate altitude
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 240 flight time total : 12000 flight time type : 3000
ASRS Report	122823
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 15000
ASRS Report	122506
Events
Anomaly	aircraft equipment problem : less severe non adherence : published procedure non adherence : clearance other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation

Narrative:

At 3000' MSL, aircraft started unscheduled, unselected 30 degree bank to left while departing sna in the LNAV mode during the musel 5 departure. The flight crew determined this to be the incorrect flight path after approximately 20 seconds, and began a standard rate turn back on course for the musel intersection. At approximately that time ATC also noticed the deviation and directed a turn back to the right. Approximately incursion from course, 1-2 mi.

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Original NASA ASRS Text

Title: TRACK DEVIATION.

Narrative: AT 3000' MSL, ACFT STARTED UNSCHEDULED, UNSELECTED 30 DEG BANK TO LEFT WHILE DEPARTING SNA IN THE LNAV MODE DURING THE MUSEL 5 DEP. THE FLT CREW DETERMINED THIS TO BE THE INCORRECT FLT PATH AFTER APPROX 20 SECS, AND BEGAN A STANDARD RATE TURN BACK ON COURSE FOR THE MUSEL INTXN. AT APPROX THAT TIME ATC ALSO NOTICED THE DEVIATION AND DIRECTED A TURN BACK TO THE RIGHT. APPROX INCURSION FROM COURSE, 1-2 MI.

Data retrieved from NASA's ASRS site as of August 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.