A bae 125 flight crew experienced a track deviation when their actual heading after receipt of a vec...

Attributes
ACN	1163199
Time
Date	201404
Local Time Of Day	1201-1800
Place
Locale Reference	D21.TRACON
State Reference	MI
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Vectors STAR SPRTN3
Flight Plan	IFR
Component
Aircraft Component	Compass (HSI/ETC)
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Multiengine Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 96 Flight Crew Total 2600 Flight Crew Type 960
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

During descent on the SPRTN3 star via lan; my captain and I noticed a discrepancy between the information our FMS/GPS was showing as well as our hsis. We were given a vector after sprtn intersection to intercept the 9R localizer into ptk. When we turned to the assigned heading ATC queried us regarding our present heading and location. At this time we realized there was an apparent malfunction with our navigation systems. We were given a descent below the ceiling and became oriented visually using local landmarks and dead reckoning. While we didn't have any system warnings or flagged (failed) avionics; it was apparent that both of our headings were approximately 90 degrees different than our actual orientation.we were subsequently cleared for a visual approach and landed without any issue as ATC helped us gain situational awareness by providing directional cues to the airport once we were in VMC conditions.after discussing the event with maintenance we are still waiting to hear back on what the issue was. The aircraft is an older model and it is not overly uncommon to have older components fail simply due to their age. Luckily my captain and I had VMC weather conditions and were able to utilize ATC and good CRM to arrive at ptk safely.

Original NASA ASRS Text

Title: A BAe 125 flight crew experienced a track deviation when their actual heading after receipt of a vector from Approach Control was approximately 90 degrees from the heading assigned.

Narrative: During descent on the SPRTN3 Star via LAN; my Captain and I noticed a discrepancy between the information our FMS/GPS was showing as well as our HSIs. We were given a vector after SPRTN intersection to intercept the 9R localizer into PTK. When we turned to the assigned heading ATC queried us regarding our present heading and location. At this time we realized there was an apparent malfunction with our navigation systems. We were given a descent below the ceiling and became oriented visually using local landmarks and dead reckoning. While we didn't have any system warnings or flagged (failed) avionics; it was apparent that both of our headings were approximately 90 degrees different than our actual orientation.We were subsequently cleared for a visual approach and landed without any issue as ATC helped us gain situational awareness by providing directional cues to the airport once we were in VMC conditions.After discussing the event with Maintenance we are still waiting to hear back on what the issue was. The aircraft is an older model and it is not overly uncommon to have older components fail simply due to their age. Luckily my Captain and I had VMC weather conditions and were able to utilize ATC and good CRM to arrive at PTK safely.

Data retrieved from NASA's ASRS site 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.

A bae 125 flight crew experienced a track deviation when their actual heading after receipt of a vector from approach control was approximately 90 degrees from the heading assigned.