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A crj-700 flight crew suffered a heading deviation on departure from lga. The aircraft was dispatched with the magnetic heading mode of the EFIS on a cdl status and the flight crew reselected the magnetic mode while in a turn; likely causing the magnetic heading to be in error. ATC advised of the error and provided additional vectors until the problem was resolved.
| Attributes | |
| ACN | 916370 |
| Time | |
| Date | 201010 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | LGA.Airport |
| State Reference | NY |
| Aircraft 1 | |
| Make Model Name | Regional Jet 700 ER/LR (CRJ700) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Route In Use | SID LGA2 |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Positional / Directional Sensing |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
Due to EFIS comp mon indications; dg mode had been selected for our take-off from lga. Departing runway 13; I was the pilot flying and followed the LGA2 departure procedure as published. Departure assigned a right turn to a heading of 310; which we initiated immediately. I called for the after take off checklist and the captain; in his flow; reselected magnetic mode. Upon rolling out on the assigned heading; ATC asked what heading we had been assigned. We stated we were on the assigned heading and were then issued another heading some 30 degrees left. We began cross checking our indications with the 'whiskey' compass and I believe there was approximately a 40 degree difference.eventually we were cleared direct to our first FMS fix; so we turned on course and proceeded with no further complications/questions from ATC about the departure headings. I read that airborne alignment can take between 10 and 35 seconds in flight; so I suspect the system could not provide the accuracy we needed departing lga. Perhaps the company should define the parameters for reselecting magnetic mode (ensure straight and level flight/not during heading sensitive departures; etc) in the aom. We couldn't seem to find much guidance on this particular system.
Original NASA ASRS Text
Title: A CRJ-700 Flight Crew suffered a heading deviation on departure from LGA. The aircraft was dispatched with the magnetic heading mode of the EFIS on a CDL status and the Flight Crew reselected the MAG mode while in a turn; likely causing the Magnetic Heading to be in error. ATC advised of the error and provided additional vectors until the problem was resolved.
Narrative: Due to EFIS COMP MON indications; DG mode had been selected for our take-off from LGA. Departing Runway 13; I was the pilot flying and followed the LGA2 departure procedure as published. Departure assigned a right turn to a heading of 310; which we initiated immediately. I called for the after take off checklist and the Captain; in his flow; reselected MAG mode. Upon rolling out on the assigned heading; ATC asked what heading we had been assigned. We stated we were on the assigned heading and were then issued another heading some 30 degrees left. We began cross checking our indications with the 'whiskey' compass and I believe there was approximately a 40 degree difference.Eventually we were cleared direct to our first FMS fix; so we turned on course and proceeded with no further complications/questions from ATC about the departure headings. I read that airborne alignment can take between 10 and 35 seconds in flight; so I suspect the system could not provide the accuracy we needed departing LGA. Perhaps the company should define the parameters for reselecting MAG mode (ensure straight and level flight/not during heading sensitive departures; etc) in the AOM. We couldn't seem to find much guidance on this particular system.
Data retrieved from NASA's ASRS site as of April 2012 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.