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Air carrier frt heavy transport aircraft lost pressurization at high altitude over an oceanic route. Aircraft equipment emergency.
| Attributes | |
| ACN | 205226 |
| Time | |
| Date | 199203 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : lon |
| State Reference | FO |
| Altitude | msl bound lower : 25000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : eggx |
| Operator | common carrier : air carrier |
| Make Model Name | Heavy Transport, Low Wing, 4 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : atlantic enroute : other oceanic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time total : 10000 |
| ASRS Report | 205226 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 75 flight time total : 9200 flight time type : 1500 |
| ASRS Report | 205224 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
While cruising at FL330 I heard a loud rushing air noise and cabin pressure began rising at approximately 5000 FPM. Crew went on oxygen and ran loss of pressurization checklist. Cabin could not be controled and investigation could only determine that noise was coming from back of cargo containers maybe near main cargo door. All cargo door lights indicated closed and no structured problems were noted. I notified shanwick oceanic that I was departing FL330 for FL250 following mmps contingency procedures. Shanwick reclred us to FL250 as I was passing FL290. At FL250 we were able to maintain the cabin at 15000 ft using both packs in maximum flow. Highest altitude cabin reached was approximately 23000 ft. I had first officer obtain new fuel figures and flight plan from our operations and requested new flight route and cruise mach from oceanic. Flight continued to original destination and landed without further incident.
Original NASA ASRS Text
Title: ACR FRT HVT ACFT LOST PRESSURIZATION AT HIGH ALT OVER AN OCEANIC RTE. ACFT EQUIP EMER.
Narrative: WHILE CRUISING AT FL330 I HEARD A LOUD RUSHING AIR NOISE AND CABIN PRESSURE BEGAN RISING AT APPROX 5000 FPM. CREW WENT ON OXYGEN AND RAN LOSS OF PRESSURIZATION CHKLIST. CABIN COULD NOT BE CTLED AND INVESTIGATION COULD ONLY DETERMINE THAT NOISE WAS COMING FROM BACK OF CARGO CONTAINERS MAYBE NEAR MAIN CARGO DOOR. ALL CARGO DOOR LIGHTS INDICATED CLOSED AND NO STRUCTURED PROBLEMS WERE NOTED. I NOTIFIED SHANWICK OCEANIC THAT I WAS DEPARTING FL330 FOR FL250 FOLLOWING MMPS CONTINGENCY PROCS. SHANWICK RECLRED US TO FL250 AS I WAS PASSING FL290. AT FL250 WE WERE ABLE TO MAINTAIN THE CABIN AT 15000 FT USING BOTH PACKS IN MAX FLOW. HIGHEST ALT CABIN REACHED WAS APPROX 23000 FT. I HAD FO OBTAIN NEW FUEL FIGURES AND FLT PLAN FROM OUR OPS AND REQUESTED NEW FLT RTE AND CRUISE MACH FROM OCEANIC. FLT CONTINUED TO ORIGINAL DEST AND LANDED WITHOUT FURTHER INCIDENT.
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.