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Small aircraft pilot on INS approach has erratic indications on altimeter and vsi. Switches to alternate static source.
| Attributes | |
| ACN | 154842 |
| Time | |
| Date | 199008 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : sch |
| State Reference | NY |
| Altitude | msl bound lower : 3150 msl bound upper : 3500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : alb |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 3000 flight time type : 1200 |
| ASRS Report | 154842 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : overshoot |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Climbing in IMC, heavy precipitation/rain, light turbulence out of 2600' for 3400'. Impact rain in static port causing erratic jumps on altimeter and vsi. Selected alternate static source during climb and leveled at 3400' assigned. When later asked to confirm level at 3400', selected normal static source and observed indicated altitude of 3150'. Reported to ATC and corrected to 3400'. Rest of approach uneventful with occasional 100-200' jumps of altimeter along with vsi excursions.
Original NASA ASRS Text
Title: SMA PLT ON INS APCH HAS ERRATIC INDICATIONS ON ALTIMETER AND VSI. SWITCHES TO ALTERNATE STATIC SOURCE.
Narrative: CLBING IN IMC, HEAVY PRECIPITATION/RAIN, LIGHT TURB OUT OF 2600' FOR 3400'. IMPACT RAIN IN STATIC PORT CAUSING ERRATIC JUMPS ON ALTIMETER AND VSI. SELECTED ALTERNATE STATIC SOURCE DURING CLB AND LEVELED AT 3400' ASSIGNED. WHEN LATER ASKED TO CONFIRM LEVEL AT 3400', SELECTED NORMAL STATIC SOURCE AND OBSERVED INDICATED ALT OF 3150'. RPTED TO ATC AND CORRECTED TO 3400'. REST OF APCH UNEVENTFUL WITH OCCASIONAL 100-200' JUMPS OF ALTIMETER ALONG WITH VSI EXCURSIONS.
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.