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A DC10-30 flight crew experiences a heading track deviation when they fail to realize that their compass system is not in sync with the float compass when departing ewr, nj.
| Attributes | |
| ACN | 455680 |
| Time | |
| Date | 199911 |
| Day | Sun |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : ewr.airport |
| State Reference | NJ |
| Altitude | msl single value : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 30F |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : flight engineer pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 150 flight time total : 14000 flight time type : 700 |
| ASRS Report | 455680 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure non adherence : company policies non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | atc equipment other atc equipment : radar other controllera |
| Resolutory Action | controller : issued alert |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Environmental Factor Company Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
After initial alignment, the compass system slewed 40 degrees left because of magnetic interference at the gate. During a relatively short, busy taxi for takeoff, the crew did not notice the discrepancy -- especially since both compass system seemed to indicate the same. Shortly after takeoff, clearance for INS use and switch to INS masked the problem of the compass system and gave correct heading. However, when departure control later assigned a heading, the switch back to magnetic resulted in large heading error. Controller pointed out our heading error and we realigned compass, corrected our heading, and solved the problem.
Original NASA ASRS Text
Title: A DC10-30 FLC EXPERIENCES A HDG TRACK DEV WHEN THEY FAIL TO REALIZE THAT THEIR COMPASS SYS IS NOT IN SYNC WITH THE FLOAT COMPASS WHEN DEPARTING EWR, NJ.
Narrative: AFTER INITIAL ALIGNMENT, THE COMPASS SYS SLEWED 40 DEGS L BECAUSE OF MAGNETIC INTERFERENCE AT THE GATE. DURING A RELATIVELY SHORT, BUSY TAXI FOR TKOF, THE CREW DID NOT NOTICE THE DISCREPANCY -- ESPECIALLY SINCE BOTH COMPASS SYS SEEMED TO INDICATE THE SAME. SHORTLY AFTER TKOF, CLRNC FOR INS USE AND SWITCH TO INS MASKED THE PROB OF THE COMPASS SYS AND GAVE CORRECT HDG. HOWEVER, WHEN DEP CTL LATER ASSIGNED A HDG, THE SWITCH BACK TO MAGNETIC RESULTED IN LARGE HDG ERROR. CTLR POINTED OUT OUR HDG ERROR AND WE REALIGNED COMPASS, CORRECTED OUR HDG, AND SOLVED 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.