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A B757-200 air carrier pilot reported the checklist procedure for a bleeds off takeoff does not call for opening the APU bleed; which would result in an unpressurized and un-airconditioned operation.
| Attributes | |
| ACN | 979722 |
| Time | |
| Date | 201111 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Flying |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 12000 Flight Crew Type 4000 |
| Events | |
| Anomaly | Deviation - Procedural Published Material / Policy |
Narrative:
Pulled up numbers for bos runway 27 departure. Data returned was for flaps 15; bleeds off takeoff. Referenced the flight manual for a bleeds off takeoff. The procedure does not exist anymore. We ran the checklist for an 'APU to packs' takeoff. The procedure includes turning off the engine bleeds; but never has us open the APU bleed air valve. We did open the APU bleed valve for takeoff; and closed it after reopening the engine bleeds; prior to turning off the APU; even though it is not in the procedure. If run according to the checklist; however; the aircraft will takeoff and climb out without actually providing air conditioning or pressurization.
Original NASA ASRS Text
Title: A B757-200 air carrier pilot reported the checklist procedure for a bleeds off takeoff does not call for opening the APU bleed; which would result in an unpressurized and un-airconditioned operation.
Narrative: Pulled up numbers for BOS Runway 27 Departure. Data returned was for Flaps 15; bleeds off takeoff. Referenced the Flight Manual for a bleeds off takeoff. The procedure does not exist anymore. We ran the checklist for an 'APU to Packs' takeoff. The procedure includes turning off the engine bleeds; but never has us open the APU bleed air Valve. We did open the APU bleed valve for takeoff; and closed it after reopening the engine bleeds; prior to turning off the APU; even though it is not in the procedure. If run according to the checklist; however; the aircraft will takeoff and climb out without actually providing air conditioning or pressurization.
Data retrieved from NASA's ASRS site as of April 2012 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.