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An HS125 flight crew had some difficulty navigating direct to a fix because their FMC processor was slow to calculate the new route.
| Attributes | |
| ACN | 853606 |
| Time | |
| Date | 200909 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.TRACON |
| State Reference | US |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | HS 125 Series |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 70 Flight Crew Total 2500 Flight Crew Type 80 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
During an arrival to an airport during some heavy rain showers the aircraft was cleared for an approach that ultimately brought the aircraft into an area of heavy rain. After entering this area a request for a vector back out of the rain was requested. The controller assigned a vector out of the heavy area of precipitation after the crew spoke with the tower and the tower informed them of the change in winds and runways at the airport. After the request was made the aircraft was sent back over to the controller from the tower to fly the new vectored heading along with a climb. The new heading brought the aircraft into VMC conditions and the aircraft was assigned a fix to fly to. The fix was entered into the FMS and the aircraft was then flying directly to the fix. During the flight to the fix the aircrafts autopilot disconnected from navigation mode into roll mode thus the aircraft did not turn to the next fix. The crew noticed this as they were monitoring the airplane and rectified the problem promptly. The aircraft's autopilot was reconnected to navigation mode and the aircraft flew to the next fix. The FMS in this particular line of aircraft due to its age does not have the fastest processor and at times takes a little longer to build inputted routing.
Original NASA ASRS Text
Title: An HS125 Flight Crew had some difficulty navigating direct to a fix because their FMC processor was slow to calculate the new route.
Narrative: During an arrival to an airport during some heavy rain showers the aircraft was cleared for an approach that ultimately brought the aircraft into an area of heavy rain. After entering this area a request for a vector back out of the rain was requested. The controller assigned a vector out of the heavy area of precipitation after the crew spoke with the tower and the tower informed them of the change in winds and runways at the airport. After the request was made the aircraft was sent back over to the controller from the tower to fly the new vectored heading along with a climb. The new heading brought the aircraft into VMC conditions and the aircraft was assigned a fix to fly to. The fix was entered into the FMS and the aircraft was then flying directly to the fix. During the flight to the fix the aircrafts autopilot disconnected from NAV mode into ROLL mode thus the aircraft did not turn to the next fix. The crew noticed this as they were monitoring the airplane and rectified the problem promptly. The aircraft's autopilot was reconnected to NAV mode and the aircraft flew to the next fix. The FMS in this particular line of aircraft due to its age does not have the fastest processor and at times takes a little longer to build inputted routing.
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.