MD80 flight crew experiences heading discrepancies during the lga 2 departure with the whitestone cl...

Narrative:

Departing lga; we were cleared to fly the lga 2; whitestone climb; first fix eloit from rwy 13. After take off; the first officer called for heading sel 180 at 400'. The FMA indicated clmp; take off; take off and when the captain tried to go to heading sel; the FMA was frozen at take off; take off. Also; the captain's and first officer's flight directors had disappeared. The aircraft entered IMC approx 1500'. At this point; the first officer rolled out on a heading of 180 on his nd. This was 30 degrees off from the captain's nd and the first officer's compass card which both showed 150. The first officer elected to fly wings level to the assigned altitude of 5000'. The ca told ATC that they were experiencing heading difficulties and that they would fly present heading until fixing the problem. ATC copied and at some point asked the crew to turn left to 360. We were VMC at this point; so we began a left turn while still diagnosing which compass card was bad. On the northern track we were able to compare both compass cards to the magnetic compass. The first officer's compass card was 30 degrees off the mag compass so he spun it to match the captain's compass card and the mag compass. At this point all FMA and FD functions returned to normal.

Original NASA ASRS Text

Title: MD80 Flight Crew experiences heading discrepancies during the LGA 2 departure with the Whitestone climb off Runway 13. ATC is advised and the First Officer (FP) maintains wings level until reaching VMC. The First Officer's compass is slewed to the magnetic compass and all systems return to normal.

Narrative: Departing LGA; we were cleared to fly the LGA 2; Whitestone climb; first fix ELOIT from Rwy 13. After Take Off; the First Officer called for HDG sel 180 at 400'. The FMA indicated CLMP; Take Off; Take Off and when the Captain tried to go to HDG Sel; the FMA was frozen at Take Off; Take Off. Also; the Captain's and First Officer's flight directors had disappeared. The aircraft entered IMC approx 1500'. At this point; the First Officer rolled out on a heading of 180 on his ND. This was 30 degrees off from the Captain's ND and the First Officer's compass card which both showed 150. The First Officer elected to fly wings level to the assigned altitude of 5000'. The CA told ATC that they were experiencing heading difficulties and that they would fly present heading until fixing the problem. ATC copied and at some point asked the crew to turn left to 360. We were VMC at this point; so we began a left turn while still diagnosing which compass card was bad. On the northern track we were able to compare both compass cards to the magnetic compass. The First Officer's compass card was 30 degrees off the mag compass so he spun it to match the Captain's compass card and the mag compass. At this point all FMA and FD functions returned to normal.

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.

Attributes
ACN	969088
Time
Date	201109
Local Time Of Day	1801-2400
Place
Locale Reference	N90.TRACON
State Reference	NY
Aircraft 1
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	AHRS/ND
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying First Officer
Events
Anomaly	Aircraft Equipment Problem Critical

MD80 flight crew experiences heading discrepancies during the lga 2 departure with the whitestone climb off runway 13. ATC is advised and the first officer (fp) maintains wings level until reaching VMC. The first officer's compass is slewed to the magnetic compass and all systems return to normal.