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A B737-500 dispatched with on pack inoperative. On approach; the cabin depressurized after the outflow valve failed in the open position.
| Attributes | |
| ACN | 798700 |
| Time | |
| Date | 200808 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 225 flight time total : 7300 flight time type : 2600 |
| ASRS Report | 798700 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
At ZZZ during taxi out captain noticed an abnormal noise affiliated with pack operation. We returned to the gate and maintenance deferred the left pack. We then departed for ZZZ1. Upon arrival in ZZZ1 while on a visual to runway 35 at approximately 3000 ft MSL; the aircraft cabin spiked to a 1000 FPM climb. The cabin then followed the aircraft descent rate. The flight continued normally and landed without incident. Contract maintenance in ZZZ1 indicated upon inspection that the main outflow valve failed in the open position.
Original NASA ASRS Text
Title: A B737-500 DISPATCHED WITH ON PACK INOP. ON APCH; THE CABIN DEPRESSURIZED AFTER THE OUTFLOW VALVE FAILED IN THE OPEN POSITION.
Narrative: AT ZZZ DURING TAXI OUT CAPT NOTICED AN ABNORMAL NOISE AFFILIATED WITH PACK OP. WE RETURNED TO THE GATE AND MAINT DEFERRED THE L PACK. WE THEN DEPARTED FOR ZZZ1. UPON ARR IN ZZZ1 WHILE ON A VISUAL TO RWY 35 AT APPROX 3000 FT MSL; THE ACFT CABIN SPIKED TO A 1000 FPM CLB. THE CABIN THEN FOLLOWED THE ACFT DSCNT RATE. THE FLT CONTINUED NORMALLY AND LANDED WITHOUT INCIDENT. CONTRACT MAINT IN ZZZ1 INDICATED UPON INSPECTION THAT THE MAIN OUTFLOW VALVE FAILED IN THE OPEN POS.
Data retrieved from NASA's ASRS site as of May 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.