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B737-300 flight crew was unable to reconfigure bleed air valves after takeoff. Aircraft was unable to maintain cabin pressurization; so flight crew returned to department airport.
| Attributes | |
| ACN | 742363 |
| Time | |
| Date | 200706 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : den.airport |
| State Reference | CO |
| Altitude | msl single value : 10000 |
| Environment | |
| Weather Elements | Thunderstorm |
| Aircraft 1 | |
| Controlling Facilities | tracon : d01.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 240 flight time total : 11000 flight time type : 4157 |
| ASRS Report | 742363 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : diverted to another airport flight crew : landed as precaution |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
During reconfign of the bleeds after a flaps 1 degree; bleeds off takeoff; the first officer noticed the #1 bleed valve was not opening. Several attempts were made with no success. The flight manual was reviewed for applicable checklists and none were found (closest was dispatch with bleed inoperative). We called dispatch with maintenance on the line. Circuit breaker was reset with no help. Additional problem was the right pack being unable to maintain cabin pressure. We temporarily fed both packs off the #2 bleed to keep the cabin from exceeding 10K. With concurrence of dispatch and maintenance decision was made to return to den. Estimated landing weight would be 116 (maximum structural is 114). Decision was made to land overweight. We flew with gear down/low altitude to help reduce weight. Uneventful return/landing was made in den. After landing reviewed events with dispatch and duty manager. The #1 bleed seemed to work normally but we were set up for a bleeds off takeoff immediately after taxi due to short taxi for takeoff.
Original NASA ASRS Text
Title: B737-300 FLT CREW WAS UNABLE TO RECONFIGURE BLEED AIR VALVES AFTER TKOF. ACFT WAS UNABLE TO MAINTAIN CABIN PRESSURIZATION; SO FLT CREW RETURNED TO DEPT ARPT.
Narrative: DURING RECONFIGN OF THE BLEEDS AFTER A FLAPS 1 DEG; BLEEDS OFF TKOF; THE FO NOTICED THE #1 BLEED VALVE WAS NOT OPENING. SEVERAL ATTEMPTS WERE MADE WITH NO SUCCESS. THE FLT MANUAL WAS REVIEWED FOR APPLICABLE CHKLISTS AND NONE WERE FOUND (CLOSEST WAS DISPATCH WITH BLEED INOP). WE CALLED DISPATCH WITH MAINT ON THE LINE. CIRCUIT BREAKER WAS RESET WITH NO HELP. ADDITIONAL PROB WAS THE R PACK BEING UNABLE TO MAINTAIN CABIN PRESSURE. WE TEMPORARILY FED BOTH PACKS OFF THE #2 BLEED TO KEEP THE CABIN FROM EXCEEDING 10K. WITH CONCURRENCE OF DISPATCH AND MAINT DECISION WAS MADE TO RETURN TO DEN. ESTIMATED LNDG WT WOULD BE 116 (MAX STRUCTURAL IS 114). DECISION WAS MADE TO LAND OVERWT. WE FLEW WITH GEAR DOWN/LOW ALT TO HELP REDUCE WT. UNEVENTFUL RETURN/LNDG WAS MADE IN DEN. AFTER LNDG REVIEWED EVENTS WITH DISPATCH AND DUTY MGR. THE #1 BLEED SEEMED TO WORK NORMALLY BUT WE WERE SET UP FOR A BLEEDS OFF TKOF IMMEDIATELY AFTER TAXI DUE TO SHORT TAXI FOR TKOF.
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.