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A musketeer ii CFI gets into possible icing conditions that affected his pitot static system, overshooting his assigned altitude in descent with an erroneously reading altimeter near alb, ny.
| Attributes | |
| ACN | 526727 |
| Time | |
| Date | 200110 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : alb.tracon |
| State Reference | NY |
| Altitude | msl bound lower : 5000 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : alb.tracon tower : jan.tower |
| Operator | general aviation : personal |
| Make Model Name | Beechcraft Single Piston Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude descent : vacating altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | observation : passenger |
| Qualification | pilot : cfi pilot : commercial pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 40 flight time total : 950 flight time type : 1.5 |
| ASRS Report | 526727 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : overshoot inflight encounter : weather non adherence : clearance non adherence : far other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : altimeter other controllera other flight crewa |
| Resolutory Action | controller : issued advisory controller : issued new clearance flight crew : exited adverse environment |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Weather Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
PF was cleared from 8000 ft to 5000 ft. During descent we encountered IMC conditions and noticed large fluctuations on altimeter. Assuming moisture and/or a trace of ice on pitot tube and static system, PF advised ATC and asked for lower. (Controller said maintain 5000 ft altitude pilot's discretion.) at that point when altimeter stabilized it read 4500 ft. Controller stated 'I know you're having some problems, but you need to maintain altitude assigned.' controller said now descend maintain 4000 ft. Shortly after that PF entered VMC and canceled IFR to stay out of visible moisture.
Original NASA ASRS Text
Title: A MUSKETEER II CFI GETS INTO POSSIBLE ICING CONDITIONS THAT AFFECTED HIS PITOT STATIC SYS, OVERSHOOTING HIS ASSIGNED ALT IN DSCNT WITH AN ERRONEOUSLY READING ALTIMETER NEAR ALB, NY.
Narrative: PF WAS CLRED FROM 8000 FT TO 5000 FT. DURING DSCNT WE ENCOUNTERED IMC CONDITIONS AND NOTICED LARGE FLUCTUATIONS ON ALTIMETER. ASSUMING MOISTURE AND/OR A TRACE OF ICE ON PITOT TUBE AND STATIC SYS, PF ADVISED ATC AND ASKED FOR LOWER. (CTLR SAID MAINTAIN 5000 FT ALT PLT'S DISCRETION.) AT THAT POINT WHEN ALTIMETER STABILIZED IT READ 4500 FT. CTLR STATED 'I KNOW YOU'RE HAVING SOME PROBS, BUT YOU NEED TO MAINTAIN ALT ASSIGNED.' CTLR SAID NOW DSND MAINTAIN 4000 FT. SHORTLY AFTER THAT PF ENTERED VMC AND CANCELED IFR TO STAY OUT OF VISIBLE MOISTURE.
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.