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Flight crew of medium large transport air carrier aircraft inadvertently failed to turn after takeoff due to an erroneous heading gyroscope setting.
| Attributes | |
| ACN | 241991 |
| Time | |
| Date | 199305 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : lga |
| State Reference | NY |
| Altitude | msl bound lower : 1500 msl bound upper : 1500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : initial climbout : intermediate altitude climbout : takeoff |
| Route In Use | departure : noise abatement departure other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | controller military : 30 controller supervisory : 11 flight time last 90 days : 0 flight time total : 90360 |
| ASRS Report | 241991 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : clearance other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Lga airport, departing runway 31. Clearance after takeoff, turn right to heading 340 degrees. After liftoff we made a very short turn to 340 degrees. This heading was indicated on both pilot's HSI's and RMI's and no inoperative flags were noted on any instruments. After 1- 2 mi the departure controller informed us that our ground track was roughly straight out runway 31. He told us to turn further right which we did. We suspected erroneous heading information at that time and tried to read our magnetic compass which was impossible. The controller worked us out of the area and we were later able to correct our gyroscope compass and it remained stable. We later investigated the incident and were informed by lga that our gate area has been reported to cause some gyroscope compass discrepancies. We were told that gate will be placarded to warn of this problem. We did not intentionally disregard an ATC instruction or violate noise abatement areas.
Original NASA ASRS Text
Title: FLC OF MLG ACR ACFT INADVERTENTLY FAILED TO TURN AFTER TKOF DUE TO AN ERRONEOUS HDG GYROSCOPE SETTING.
Narrative: LGA ARPT, DEPARTING RWY 31. CLRNC AFTER TKOF, TURN R TO HDG 340 DEGS. AFTER LIFTOFF WE MADE A VERY SHORT TURN TO 340 DEGS. THIS HDG WAS INDICATED ON BOTH PLT'S HSI'S AND RMI'S AND NO INOP FLAGS WERE NOTED ON ANY INSTS. AFTER 1- 2 MI THE DEP CTLR INFORMED US THAT OUR GND TRACK WAS ROUGHLY STRAIGHT OUT RWY 31. HE TOLD US TO TURN FURTHER R WHICH WE DID. WE SUSPECTED ERRONEOUS HDG INFO AT THAT TIME AND TRIED TO READ OUR MAGNETIC COMPASS WHICH WAS IMPOSSIBLE. THE CTLR WORKED US OUT OF THE AREA AND WE WERE LATER ABLE TO CORRECT OUR GYROSCOPE COMPASS AND IT REMAINED STABLE. WE LATER INVESTIGATED THE INCIDENT AND WERE INFORMED BY LGA THAT OUR GATE AREA HAS BEEN RPTED TO CAUSE SOME GYROSCOPE COMPASS DISCREPANCIES. WE WERE TOLD THAT GATE WILL BE PLACARDED TO WARN OF THIS PROB. WE DID NOT INTENTIONALLY DISREGARD AN ATC INSTRUCTION OR VIOLATE NOISE ABATEMENT AREAS.
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.