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An A319 captain reported that, even though engine #1 bleed was deferred, he activated the switch during a pressurization problem he experienced after departing ord. The problem was significant enough to mandate a return to ord.
| Attributes | |
| ACN | 629009 |
| Time | |
| Date | 200408 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : ord.airport |
| State Reference | IL |
| Altitude | msl single value : 29000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level descent : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 270 flight time total : 16000 flight time type : 2500 |
| ASRS Report | 629009 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure non adherence : far non adherence : company policies |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : diverted to another airport flight crew : overcame equipment problem flight crew : landed as precaution other |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
Engine #1 bleed deferred inoperative. Upon reaching crz altitude, FL290, followed by an air right wing leak, with no air source, cabin altitude started to climb. Started APU and requested lower altitude. In the meantime, tried engine #1 bleed switch to 'on' successfully. Controling cabin, at 21000 ft, APU air provided air for pressurization. Requested a return to ord at FL180 and returned to gate. Note, highest cabin altitude was 7380 ft. We had flown the aircraft on the previous leg and we knew about the deferred engine #1 bleed and its condition. Because of that, we tried to use it in this case, preventing a worse situation from developing. It worked until APU air was available for pressurization, followed by a normal approach and landing in ord.
Original NASA ASRS Text
Title: AN A319 CAPT RPTED THAT, EVEN THOUGH ENG #1 BLEED WAS DEFERRED, HE ACTIVATED THE SWITCH DURING A PRESSURIZATION PROB HE EXPERIENCED AFTER DEPARTING ORD. THE PROB WAS SIGNIFICANT ENOUGH TO MANDATE A RETURN TO ORD.
Narrative: ENG #1 BLEED DEFERRED INOP. UPON REACHING CRZ ALT, FL290, FOLLOWED BY AN AIR R WING LEAK, WITH NO AIR SOURCE, CABIN ALT STARTED TO CLB. STARTED APU AND REQUESTED LOWER ALT. IN THE MEANTIME, TRIED ENG #1 BLEED SWITCH TO 'ON' SUCCESSFULLY. CTLING CABIN, AT 21000 FT, APU AIR PROVIDED AIR FOR PRESSURIZATION. REQUESTED A RETURN TO ORD AT FL180 AND RETURNED TO GATE. NOTE, HIGHEST CABIN ALT WAS 7380 FT. WE HAD FLOWN THE ACFT ON THE PREVIOUS LEG AND WE KNEW ABOUT THE DEFERRED ENG #1 BLEED AND ITS CONDITION. BECAUSE OF THAT, WE TRIED TO USE IT IN THIS CASE, PREVENTING A WORSE SIT FROM DEVELOPING. IT WORKED UNTIL APU AIR WAS AVAILABLE FOR PRESSURIZATION, FOLLOWED BY A NORMAL APCH AND LNDG IN ORD.
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.