A DC10-30 departed a gate with a 40 degree magnetic error resulting in a heading deviation corrected...

Attributes
ACN	455228
Time
Date	199911
Day	Sun
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : ewr.airport
State Reference	NJ
Altitude	agl bound lower : 0 agl bound upper : 6982
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-10 30F
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : atp pilot : commercial pilot : flight engineer technician : powerplant technician : airframe
Experience	flight time last 90 days : 83 flight time total : 18000 flight time type : 310
ASRS Report	455228
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 20 flight time total : 13000 flight time type : 250
ASRS Report	455389
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued advisory flight crew : returned to intended or assigned course
Supplementary
Problem Areas	Aircraft Environmental Factor Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After initial alignment, compass system slewed 40 degrees left because of strong magnetic field at our gate. During multi turn short taxi, crew didn't notice discrepancy. Shortly after takeoff clearance, INS use and masked magnetic compass problem. Later assigned heading the switch back to magnetic resulted in large heading error. Center pointed out our error and we realigned compass system, corrected our heading and relieved the problem.

Original NASA ASRS Text

Title: A DC10-30 DEPARTED A GATE WITH A 40 DEG MAGNETIC ERROR RESULTING IN A HEADING DEV CORRECTED BY ATC.

Narrative: AFTER INITIAL ALIGNMENT, COMPASS SYS SLEWED 40 DEGS L BECAUSE OF STRONG MAGNETIC FIELD AT OUR GATE. DURING MULTI TURN SHORT TAXI, CREW DIDN'T NOTICE DISCREPANCY. SHORTLY AFTER TKOF CLRNC, INS USE AND MASKED MAGNETIC COMPASS PROB. LATER ASSIGNED HEADING THE SWITCH BACK TO MAGNETIC RESULTED IN LARGE HEADING ERROR. CTR POINTED OUT OUR ERROR AND WE REALIGNED COMPASS SYS, CORRECTED OUR HEADING AND RELIEVED THE PROB.

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.

A DC10-30 departed a gate with a 40 degree magnetic error resulting in a heading deviation corrected by ATC.