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An EMB135 at FL200 dispatched with 1 air conditioning pack deferred inoperative and attempting to adjust the remaining pack the cabin began to climb.
| Attributes | |
| ACN | 654207 |
| Time | |
| Date | 200504 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : hpw.vortac |
| State Reference | VA |
| Altitude | msl single value : 20000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc tower : cvg.tower |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 135 ER&LR |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer pilot : multi engine pilot : instrument |
| Experience | flight time last 90 days : 35 flight time total : 8300 flight time type : 35 |
| ASRS Report | 654207 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : cabin altitude indicator other flight crewa other flight crewb |
| Resolutory Action | aircraft : equipment problem dissipated controller : issued new clearance flight crew : returned to assigned altitude flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Problem Areas | Aircraft Environmental Factor |
| Primary Problem | Aircraft |
Narrative:
While departing rdu with 1 air conditioning pack inoperative; we experienced an overload on our only remaining air conditioning pack. The cabin altitude began to climb slowly. We were climbing through FL200 on our way to FL230. We requested a descent clearance to 10000 ft. The controller cleared us to descend and maintain 10000 ft. Once we leveled off; we completed all appropriate checklists. We were able to reset the overloaded air conditioning pack. Once we regained full control of our pressurization; we requested a climb clearance. The controller cleared us to FL230. We continued the flight safely to ZZZ. The entire chain of events was started when the passenger complained of a warm cabin. We attempted to cool the cabin by going to manual mode on the air conditioning pack. This must have overloaded the air conditioning pack. We were able to reset it normally in the automatic mode.
Original NASA ASRS Text
Title: AN EMB135 AT FL200 DISPATCHED WITH 1 AIR CONDITIONING PACK DEFERRED INOP AND ATTEMPTING TO ADJUST THE REMAINING PACK THE CABIN BEGAN TO CLB.
Narrative: WHILE DEPARTING RDU WITH 1 AIR CONDITIONING PACK INOP; WE EXPERIENCED AN OVERLOAD ON OUR ONLY REMAINING AIR CONDITIONING PACK. THE CABIN ALT BEGAN TO CLB SLOWLY. WE WERE CLBING THROUGH FL200 ON OUR WAY TO FL230. WE REQUESTED A DSCNT CLRNC TO 10000 FT. THE CTLR CLRED US TO DSND AND MAINTAIN 10000 FT. ONCE WE LEVELED OFF; WE COMPLETED ALL APPROPRIATE CHKLISTS. WE WERE ABLE TO RESET THE OVERLOADED AIR CONDITIONING PACK. ONCE WE REGAINED FULL CTL OF OUR PRESSURIZATION; WE REQUESTED A CLB CLRNC. THE CTLR CLRED US TO FL230. WE CONTINUED THE FLT SAFELY TO ZZZ. THE ENTIRE CHAIN OF EVENTS WAS STARTED WHEN THE PAX COMPLAINED OF A WARM CABIN. WE ATTEMPTED TO COOL THE CABIN BY GOING TO MANUAL MODE ON THE AIR CONDITIONING PACK. THIS MUST HAVE OVERLOADED THE AIR CONDITIONING PACK. WE WERE ABLE TO RESET IT NORMALLY IN THE AUTO MODE.
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.