Pilot of C310 receives low altitude alert on ILS approach. Suspects faulty pitot static system.

Attributes
ACN	745413
Time
Date	200706
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mkc.airport
State Reference	MO
Altitude	msl single value : 2040
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mkc.tower
Operator	general aviation : corporate
Make Model Name	Cessna 310/T310C
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : 3
Flight Phase	descent : approach ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 50 flight time total : 3000 flight time type : 1500
ASRS Report	745413
Events
Anomaly	aircraft equipment problem : less severe other spatial deviation
Independent Detector	aircraft equipment : gpws aircraft equipment other aircraft equipment : low alt alert
Resolutory Action	flight crew : executed go around
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Vectored onto ILS localizer runway 3 mkc; intercepted with localizer and GS centered and stable with 600 FPM descent. With localizer and GS needles centered received a low altitude alert between ris 5.2 DME and 4.1 DME. Immediate climb initiated with localizer still centered; abandoned GS component of ILS approach. GS now full deflection down. At 2.5 DME and ris 2000 ft MSL visual contact with airport with localizer centered. Landed runway 3. Before shutdown; confirmed altitude setting at 30.07 as advised by approach controller while being vectored to ILS runway 3. In VFR; confirmed altitude displaying 100 ft lower than expected with centered localizer/GS needles at hys ILS runway 34 4.8 DME 3364 expected; meter reading was 3264. Will address with avionics shop; and also have altimeter p-static calibration confirmed at same time. Will also have emergency static-static drain valve checked for leaks.

Original NASA ASRS Text

Title: PLT OF C310 RECEIVES LOW ALT ALERT ON ILS APCH. SUSPECTS FAULTY PITOT STATIC SYSTEM.

Narrative: VECTORED ONTO ILS LOC RWY 3 MKC; INTERCEPTED WITH LOC AND GS CTRED AND STABLE WITH 600 FPM DSCNT. WITH LOC AND GS NEEDLES CTRED RECEIVED A LOW ALT ALERT BTWN RIS 5.2 DME AND 4.1 DME. IMMEDIATE CLB INITIATED WITH LOC STILL CTRED; ABANDONED GS COMPONENT OF ILS APCH. GS NOW FULL DEFLECTION DOWN. AT 2.5 DME AND RIS 2000 FT MSL VISUAL CONTACT WITH ARPT WITH LOC CTRED. LANDED RWY 3. BEFORE SHUTDOWN; CONFIRMED ALT SETTING AT 30.07 AS ADVISED BY APCH CTLR WHILE BEING VECTORED TO ILS RWY 3. IN VFR; CONFIRMED ALT DISPLAYING 100 FT LOWER THAN EXPECTED WITH CTRED LOC/GS NEEDLES AT HYS ILS RWY 34 4.8 DME 3364 EXPECTED; METER READING WAS 3264. WILL ADDRESS WITH AVIONICS SHOP; AND ALSO HAVE ALTIMETER P-STATIC CALIBRATION CONFIRMED AT SAME TIME. WILL ALSO HAVE EMER STATIC-STATIC DRAIN VALVE CHKED FOR LEAKS.

Data retrieved from NASA's ASRS site as of January 2009 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.