B747-100 PIC suffers a heading track deviation when failing to compensate for a failed HSI after receiving an amended clearance route change from sct, ca.

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Attributes
ACN	509810
Time
Date	200105
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	intersection : petis
State Reference	CA
Altitude	msl single value : 4200
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B747-100
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : multi engine
Experience	flight time last 90 days : 53 flight time total : 7000 flight time type : 250
ASRS Report	509810
Events
Anomaly	non adherence : clearance other spatial deviation
Resolutory Action	controller : issued advisory none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ATC cleared us direct to petis (sb). Both capts and first officer's raw data on RMI indicated direct to petis as well as INS indicating 2 mi. ATC advised we were 2 mi south of course. We were delayed at departure airport due to captain's HSI inoperative. The captain's HSI completely died en route. Therefore, captain had no navigation on his side.

Original NASA ASRS Text

Title: B747-100 PIC SUFFERS A HDG TRACK DEV WHEN FAILING TO COMPENSATE FOR A FAILED HSI AFTER RECEIVING AN AMENDED CLRNC RTE CHANGE FROM SCT, CA.

Narrative: ATC CLRED US DIRECT TO PETIS (SB). BOTH CAPTS AND FO'S RAW DATA ON RMI INDICATED DIRECT TO PETIS AS WELL AS INS INDICATING 2 MI. ATC ADVISED WE WERE 2 MI S OF COURSE. WE WERE DELAYED AT DEP ARPT DUE TO CAPT'S HSI INOP. THE CAPT'S HSI COMPLETELY DIED ENRTE. THEREFORE, CAPT HAD NO NAV ON HIS SIDE.

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.