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Captain of air carrier medium large transport failed to slave the heading gyro with the magmetic compass during takeoff causing a deviation from assigned turn heading after takeoff.
| Attributes | |
| ACN | 268403 |
| Time | |
| Date | 199404 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : lga |
| State Reference | NY |
| Altitude | agl bound lower : 500 agl bound upper : 1500 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 9500 flight time type : 3300 |
| ASRS Report | 268403 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : overcame equipment problem other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Departure procedure called for initial turn to 175 degrees. At liftoff we were already almost on that heading -- approximately 40 degree from what runway heading should have been. I must have missed on my xchk as we took the runway that the compass heading was off. First officer had set heading bug to 175 degree which was just about lined up with the runway. I normally set heading bug to runway heading which may be why I missed the misalignment of the compass as we took the runway. Departure control had given us a couple of heading changes very soon after takeoff before we had a chance to correct and slave the compass with the magnetic compass. We reported our compass discrepancy to ATC and he concurred that it looked like the headings we were flying were about 30-40 degrees off what he assigned. He advised us to let him know if assistance was needed. By this time we had corrected the problem and advised ATC. I recalled then seeing a NOTAM warning of compass interference at some of our gates due to undergnd storage facilities at lga. The flight proceeded with no further difficulties. I always check compass for proper alignment before takeoff, but this time I must have 'looked without really seeing.'
Original NASA ASRS Text
Title: CAPT OF ACR MLG FAILED TO SLAVE THE HDG GYRO WITH THE MAGMETIC COMPASS DURING TKOF CAUSING A DEV FROM ASSIGNED TURN HDG AFTER TKOF.
Narrative: DEP PROC CALLED FOR INITIAL TURN TO 175 DEGS. AT LIFTOFF WE WERE ALREADY ALMOST ON THAT HDG -- APPROX 40 DEG FROM WHAT RWY HDG SHOULD HAVE BEEN. I MUST HAVE MISSED ON MY XCHK AS WE TOOK THE RWY THAT THE COMPASS HDG WAS OFF. FO HAD SET HDG BUG TO 175 DEG WHICH WAS JUST ABOUT LINED UP WITH THE RWY. I NORMALLY SET HDG BUG TO RWY HDG WHICH MAY BE WHY I MISSED THE MISALIGNMENT OF THE COMPASS AS WE TOOK THE RWY. DEP CTL HAD GIVEN US A COUPLE OF HDG CHANGES VERY SOON AFTER TKOF BEFORE WE HAD A CHANCE TO CORRECT AND SLAVE THE COMPASS WITH THE MAGNETIC COMPASS. WE RPTED OUR COMPASS DISCREPANCY TO ATC AND HE CONCURRED THAT IT LOOKED LIKE THE HDGS WE WERE FLYING WERE ABOUT 30-40 DEGS OFF WHAT HE ASSIGNED. HE ADVISED US TO LET HIM KNOW IF ASSISTANCE WAS NEEDED. BY THIS TIME WE HAD CORRECTED THE PROB AND ADVISED ATC. I RECALLED THEN SEEING A NOTAM WARNING OF COMPASS INTERFERENCE AT SOME OF OUR GATES DUE TO UNDERGND STORAGE FACILITIES AT LGA. THE FLT PROCEEDED WITH NO FURTHER DIFFICULTIES. I ALWAYS CHK COMPASS FOR PROPER ALIGNMENT BEFORE TKOF, BUT THIS TIME I MUST HAVE 'LOOKED WITHOUT REALLY SEEING.'
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.