Medium large transport crew had track deviation flying the loupe 9 SID at sjc.

Attributes
ACN	489018
Time
Date	200010
Day	Tue
Local Time Of Day	0601 To 1200
Place
State Reference	CA
Altitude	msl single value : 5000
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	tracon : o90.tracon
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : loupe 9
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : o90.tracon
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : loupe 9
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 230 flight time total : 25000 flight time type : 8000
ASRS Report	489018
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe conflict : airborne less severe non adherence : published procedure non adherence : company policies non adherence : clearance other anomaly other other spatial deviation
Independent Detector	aircraft equipment : tcas other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : took precautionary avoidance action none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

A misreading of the elements of the loupe nine departure, linden transition. Mistake was discovered at approximately 6 mi from sjc VOR and immediate right turn back to the VOR was made to return to the 4 mi restr on the departure. At this point, TA was received on aircraft that departed after us at sjc. Aircraft was in sight, but was necessary for departure to climb us out of 5000 ft to 12000 ft. Departure procedure is confusing in that radar vector appears to be for another transition. Our first assumption was to intercept the 339 degree radial outbound to dyblo. Another factor was failure of flight directors on takeoff, an added distraction. In 2 previous weeks had flown sjc 8 departure which is very similar in beginning and assumed the vector line was to another transition. Suggestion (show vector line looping back around to sjc VOR).

Original NASA ASRS Text

Title: MLG CREW HAD TRACK DEV FLYING THE LOUPE 9 SID AT SJC.

Narrative: A MISREADING OF THE ELEMENTS OF THE LOUPE NINE DEP, LINDEN TRANSITION. MISTAKE WAS DISCOVERED AT APPROX 6 MI FROM SJC VOR AND IMMEDIATE R TURN BACK TO THE VOR WAS MADE TO RETURN TO THE 4 MI RESTR ON THE DEP. AT THIS POINT, TA WAS RECEIVED ON ACFT THAT DEPARTED AFTER US AT SJC. ACFT WAS IN SIGHT, BUT WAS NECESSARY FOR DEP TO CLB US OUT OF 5000 FT TO 12000 FT. DEP PROC IS CONFUSING IN THAT RADAR VECTOR APPEARS TO BE FOR ANOTHER TRANSITION. OUR FIRST ASSUMPTION WAS TO INTERCEPT THE 339 DEG RADIAL OUTBOUND TO DYBLO. ANOTHER FACTOR WAS FAILURE OF FLT DIRECTORS ON TKOF, AN ADDED DISTR. IN 2 PREVIOUS WKS HAD FLOWN SJC 8 DEP WHICH IS VERY SIMILAR IN BEGINNING AND ASSUMED THE VECTOR LINE WAS TO ANOTHER TRANSITION. SUGGESTION (SHOW VECTOR LINE LOOPING BACK AROUND TO SJC VOR).

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.