<< >> NASA ASRS Report 825789, February 2009

C310 pilot is notified by ATC that he is more than 3;000 ft below the altitude indicated on the primary altimeter. Standby altimeter verifies the error.

Attributes
ACN	825789
Time
Date	200902
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Make Model Name	Cessna 310/T310C
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Route In Use	Vectors
Flight Plan	IFR
Component
Aircraft Component	Altimeter
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Multiengine Flight Crew Commercial Flight Crew Instrument
Experience	Flight Crew Last 90 Days 71 Flight Crew Total 28184
Person 2
Function	Enroute
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT

Narrative:

While descending in VMC with center; the primary altimeter was showing +/-6;400 ft; and ATC says we are showing below 3;000 ft (clearance was to 4;300 ft). Checked standby altimeter (far right lower instrument panel) and confirmed low. Climbed back to assigned altitude and proceeded with ILS runway 24 approach at ZZZ using standby altimeter and GS. Primary altimeter continued to malfunction throughout approach and after landing!

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Original NASA ASRS Text

Title: C310 pilot is notified by ATC that he is more than 3;000 FT below the altitude indicated on the primary altimeter. Standby altimeter verifies the error.

Narrative: While descending in VMC with Center; the primary altimeter was showing +/-6;400 FT; and ATC says we are showing below 3;000 FT (clearance was to 4;300 FT). Checked standby altimeter (far right lower instrument panel) and confirmed low. Climbed back to assigned altitude and proceeded with ILS Runway 24 approach at ZZZ using standby altimeter and GS. Primary altimeter continued to malfunction throughout approach and after landing!

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.