<< >> NASA ASRS Report 1047505, November 2012

An air carrier aircraft departed on the psp cathedral one and had a track deviation to the west of the 310 degree track in the GPS nav mode. ATC commented that other aircraft had the same behavior.

Attributes
ACN	1047505
Time
Date	201211
Local Time Of Day	0601-1200
Place
Locale Reference	PSP.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	SID CATHEDRAL ONE
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

At 400 ft; navigation was selected; aircraft track was within limits on the departure procedure. ATC questioned our position and said we were well left of course. The weather was clear and no other aircraft was in our vicinity. He then gave us a follow on clearance which negated the rest of the procedure. Our systems did not appear to be at fault. I would suggest fly the procedure using raw data instead of navigation.

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Original NASA ASRS Text

Title: An air carrier aircraft departed on the PSP Cathedral One and had a track deviation to the west of the 310 degree track in the GPS nav mode. ATC commented that other aircraft had the same behavior.

Narrative: At 400 FT; NAV was selected; aircraft track was within limits on the departure procedure. ATC questioned our position and said we were well left of course. The weather was clear and no other aircraft was in our vicinity. He then gave us a follow on clearance which negated the rest of the procedure. Our systems did not appear to be at fault. I would suggest fly the procedure using raw data instead of NAV.

Data retrieved from NASA's ASRS site as of July 2013 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.