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Small transport had bad directional gyroscope and an intermittent mode C.
| Attributes | |
| ACN | 193911 |
| Time | |
| Date | 199111 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : boi |
| State Reference | ID |
| Altitude | msl bound lower : 6000 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : boi tracon : azo |
| Operator | other |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 8000 flight time type : 200 |
| ASRS Report | 193911 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
The aircraft was just out of maintenance for a bad alternator the day before. Pre takeoff checks were normal and I lined the aircraft up on runway 10L and set my bug so I could maintain runway heading after takeoff (this was my clearance). After takeoff I was asked to turn to 260 degrees. I set my bug and let the autoplt take me around to 260 degrees. I was then asked to turn to 060 degrees and intercept my airway. I set the bug to 060 degrees and departure told me I was flying 120 degrees. My HSI and RMI showed 060 degrees. I turned my windshield heat off and used my magnetic compass to get on course and checked the VOR radial. I slaved the HSI back to where it should have been and I intercepted the airway. The HSI would not stay lined up and would precess around as soon as I set it. I went to my #2 VOR and magnetic heading as well as the RMI (proper radial and VOR information was being indicated). I elected to continue to my destination at mso as it was VFR and as soon as I got the opportunity to cancel IFR I did so. I also had a transponder that was acting up on departure but someway or other started operating properly in about the first 10 mins of flight. I did all proper preflight checks and believe I chose the best option to go to VFR and land at my destination when the problem was found. After departure pointed out the problem I had no further problems as I was aware of the situation and used my backup system.
Original NASA ASRS Text
Title: SMT HAD BAD DIRECTIONAL GYROSCOPE AND AN INTERMITTENT MODE C.
Narrative: THE ACFT WAS JUST OUT OF MAINT FOR A BAD ALTERNATOR THE DAY BEFORE. PRE TKOF CHKS WERE NORMAL AND I LINED THE ACFT UP ON RWY 10L AND SET MY BUG SO I COULD MAINTAIN RWY HDG AFTER TKOF (THIS WAS MY CLRNC). AFTER TKOF I WAS ASKED TO TURN TO 260 DEGS. I SET MY BUG AND LET THE AUTOPLT TAKE ME AROUND TO 260 DEGS. I WAS THEN ASKED TO TURN TO 060 DEGS AND INTERCEPT MY AIRWAY. I SET THE BUG TO 060 DEGS AND DEP TOLD ME I WAS FLYING 120 DEGS. MY HSI AND RMI SHOWED 060 DEGS. I TURNED MY WINDSHIELD HEAT OFF AND USED MY MAGNETIC COMPASS TO GET ON COURSE AND CHKED THE VOR RADIAL. I SLAVED THE HSI BACK TO WHERE IT SHOULD HAVE BEEN AND I INTERCEPTED THE AIRWAY. THE HSI WOULD NOT STAY LINED UP AND WOULD PRECESS AROUND AS SOON AS I SET IT. I WENT TO MY #2 VOR AND MAGNETIC HDG AS WELL AS THE RMI (PROPER RADIAL AND VOR INFO WAS BEING INDICATED). I ELECTED TO CONTINUE TO MY DEST AT MSO AS IT WAS VFR AND AS SOON AS I GOT THE OPPORTUNITY TO CANCEL IFR I DID SO. I ALSO HAD A TRANSPONDER THAT WAS ACTING UP ON DEP BUT SOMEWAY OR OTHER STARTED OPERATING PROPERLY IN ABOUT THE FIRST 10 MINS OF FLT. I DID ALL PROPER PREFLT CHKS AND BELIEVE I CHOSE THE BEST OPTION TO GO TO VFR AND LAND AT MY DEST WHEN THE PROBLEM WAS FOUND. AFTER DEP POINTED OUT THE PROBLEM I HAD NO FURTHER PROBLEMS AS I WAS AWARE OF THE SITUATION AND USED MY BACKUP SYS.
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.