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An air carrier medium large transport, on an FAA proving run, declared an emergency when they lost pressurization momentarily.
| Attributes | |
| ACN | 248972 |
| Time | |
| Date | 199308 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : swl |
| State Reference | MD |
| Altitude | msl bound lower : 29000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc tower : lax |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 17000 flight time type : 100 |
| ASRS Report | 248972 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 60 flight time total : 7500 flight time type : 300 |
| ASRS Report | 249233 |
| 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 flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
I was the first officer on this FAA proving run flight, mco-bgr. There were several complaints that the passenger cabin was very cold. After each complaint, the temperature control was moved to a slightly warmer position. Both packs tripped causing the cabin to begin to depressurize. The captain declared an emergency and was cleared to descend to FL290 at which point both packs were reinstated. The flight continued to destination without further problems. Supplemental information from acn 249233: I switched both temperature controls to manual mode and manually adjusted for a rise in duet temperature. I tweaked the controls until the duct temperature was set at approximately 130 degree F. The right pack trip off lines and the duct temperature showing off scale hot. I followed QRH procedures for resetting the right pack, the pack would not reset. The left pack tripped off. Resetting the left pack was also unsuccessful. The cabin altitude rose to an altitude of 11500 ft during the event.
Original NASA ASRS Text
Title: AN ACR MLG, ON AN FAA PROVING RUN, DECLARED AN EMER WHEN THEY LOST PRESSURIZATION MOMENTARILY.
Narrative: I WAS THE FO ON THIS FAA PROVING RUN FLT, MCO-BGR. THERE WERE SEVERAL COMPLAINTS THAT THE PAX CABIN WAS VERY COLD. AFTER EACH COMPLAINT, THE TEMP CTL WAS MOVED TO A SLIGHTLY WARMER POS. BOTH PACKS TRIPPED CAUSING THE CABIN TO BEGIN TO DEPRESSURIZE. THE CAPT DECLARED AN EMER AND WAS CLRED TO DSND TO FL290 AT WHICH POINT BOTH PACKS WERE REINSTATED. THE FLT CONTINUED TO DEST WITHOUT FURTHER PROBS. SUPPLEMENTAL INFORMATION FROM ACN 249233: I SWITCHED BOTH TEMP CTLS TO MANUAL MODE AND MANUALLY ADJUSTED FOR A RISE IN DUET TEMP. I TWEAKED THE CTLS UNTIL THE DUCT TEMP WAS SET AT APPROX 130 DEG F. THE R PACK TRIP OFF LINES AND THE DUCT TEMP SHOWING OFF SCALE HOT. I FOLLOWED QRH PROCS FOR RESETTING THE R PACK, THE PACK WOULD NOT RESET. THE L PACK TRIPPED OFF. RESETTING THE L PACK WAS ALSO UNSUCCESSFUL. THE CABIN ALT ROSE TO AN ALT OF 11500 FT DURING THE EVENT.
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.