Narrative:

Approximately 20 mins out of ZZZ while descending through FL370 on an IFR flight plan to ZZZ with 3 passenger on board; the cabin started to climb rapidly at approximately 2000 FPM and unable to control the pressurization. The cabin altitude red light on the annunciator panel light went on and the aural horn warning sound was heard so emergency rapid depressurization procedures were initiated; a call to center declaring an emergency was made; and a check on passenger was made to put on the oxygen masks and fasten seatbelts. A clearance to 10000 ft ws received and a heading direct to ZZZ airport by ATC. WX at ZZZ was VFR; better than 5000 ft and 5 mi; so a visual approach was given to land on runway 17. The descent and in-range checklist were completed; vref speed was set; and passenger were checked and informed as to the status of the flight. Runway was sighted; and the before landing checklist was completed. A normal landing was made and crash fire rescue equipment equipment was standing by; but their service was not required. All souls on board were ok and ATC was thanked for their assistance and professionalism.

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Original NASA ASRS Text

Title: FLT CREW OF H25B SUFFERS LOSS OF PRESSURIZATION WHEN BEGINNING DSCNT. MAKE EMER DSCNT AND LAND SAFELY AT DEST.

Narrative: APPROX 20 MINS OUT OF ZZZ WHILE DSNDING THROUGH FL370 ON AN IFR FLT PLAN TO ZZZ WITH 3 PAX ON BOARD; THE CABIN STARTED TO CLB RAPIDLY AT APPROX 2000 FPM AND UNABLE TO CTL THE PRESSURIZATION. THE CABIN ALT RED LIGHT ON THE ANNUNCIATOR PANEL LIGHT WENT ON AND THE AURAL HORN WARNING SOUND WAS HEARD SO EMER RAPID DEPRESSURIZATION PROCS WERE INITIATED; A CALL TO CTR DECLARING AN EMER WAS MADE; AND A CHK ON PAX WAS MADE TO PUT ON THE OXYGEN MASKS AND FASTEN SEATBELTS. A CLRNC TO 10000 FT WS RECEIVED AND A HDG DIRECT TO ZZZ ARPT BY ATC. WX AT ZZZ WAS VFR; BETTER THAN 5000 FT AND 5 MI; SO A VISUAL APCH WAS GIVEN TO LAND ON RWY 17. THE DSCNT AND IN-RANGE CHKLIST WERE COMPLETED; VREF SPD WAS SET; AND PAX WERE CHKED AND INFORMED AS TO THE STATUS OF THE FLT. RWY WAS SIGHTED; AND THE BEFORE LNDG CHKLIST WAS COMPLETED. A NORMAL LNDG WAS MADE AND CFR EQUIP WAS STANDING BY; BUT THEIR SVC WAS NOT REQUIRED. ALL SOULS ON BOARD WERE OK AND ATC WAS THANKED FOR THEIR ASSISTANCE AND PROFESSIONALISM.

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.