Narrative:

After takeoff in solid IMC, airspeed indicator failed and went to zero. Aircraft would not climb above 900 ft until 5-6 mins into the flight when 500 FPM climb began to 3000 ft (assigned altitude). Iad controller gave vectors for ILS runway 1R. Approach missed when aircraft failed to descend to decision ht. Aircraft diverted to davison army field for radar approachs. Three missed approachs. Pilot then depressurized the aircraft and static system returned to normal operation. A successful radar approach was made to davison army field (500 ft and 1 mi). Problem later diagnosed as a broken static line inside the pressure capsule. Cabin pressure took over the airspeed, vsi, and altimeter which all gave inaccurate indications. This was a very serious incident. Unless the aircraft was depressurized, there would have been no way to successfully complete the flight. There was no VFR field in range. Pilot trains annually at flight school and/or ground school. No beechcraft pubs or training materials ever describe the possibility of such an event or how to detect it. This should be mandatory for all poh and training materials for all pressurized aircraft.

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Original NASA ASRS Text

Title: A BEECH 58P AFTER TKOF DECLARED AN EMER DUE TO ALL STATIC PRESSURE SERVED INSTS FAILING CAUSED BY A BROKEN INTERIOR STATIC LINE ALLOWING CABIN PRESSURE TO ENTER AND PRESSURIZE THE STATIC SYS. AFTER DEPRESURIZING THE CABIN THE INSTS RETURNED TO NORMAL.

Narrative: AFTER TKOF IN SOLID IMC, AIRSPD INDICATOR FAILED AND WENT TO ZERO. ACFT WOULD NOT CLB ABOVE 900 FT UNTIL 5-6 MINS INTO THE FLT WHEN 500 FPM CLB BEGAN TO 3000 FT (ASSIGNED ALT). IAD CTLR GAVE VECTORS FOR ILS RWY 1R. APCH MISSED WHEN ACFT FAILED TO DSND TO DECISION HT. ACFT DIVERTED TO DAVISON ARMY FIELD FOR RADAR APCHS. THREE MISSED APCHS. PLT THEN DEPRESSURIZED THE ACFT AND STATIC SYS RETURNED TO NORMAL OP. A SUCCESSFUL RADAR APCH WAS MADE TO DAVISON ARMY FIELD (500 FT AND 1 MI). PROB LATER DIAGNOSED AS A BROKEN STATIC LINE INSIDE THE PRESSURE CAPSULE. CABIN PRESSURE TOOK OVER THE AIRSPD, VSI, AND ALTIMETER WHICH ALL GAVE INACCURATE INDICATIONS. THIS WAS A VERY SERIOUS INCIDENT. UNLESS THE ACFT WAS DEPRESSURIZED, THERE WOULD HAVE BEEN NO WAY TO SUCCESSFULLY COMPLETE THE FLT. THERE WAS NO VFR FIELD IN RANGE. PLT TRAINS ANNUALLY AT FLT SCHOOL AND/OR GND SCHOOL. NO BEECHCRAFT PUBS OR TRAINING MATERIALS EVER DESCRIBE THE POSSIBILITY OF SUCH AN EVENT OR HOW TO DETECT IT. THIS SHOULD BE MANDATORY FOR ALL POH AND TRAINING MATERIALS FOR ALL PRESSURIZED ACFT.

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.