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A319 pilot reported making a mistake with the aircraft's packs because of an unclear checklist.
| Attributes | |
| ACN | 1594913 |
| Time | |
| Date | 201811 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Taxi |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Air Conditioning and Pressurization Pack |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Commercial Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Total 1977 Flight Crew Type 1977 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
After starting engine number 2 on taxi; we ran the maintenance check procedure for MEL [for] operations placard. Defect: engine high pressure valve inoperative and secured closed.the check was normal. However; we had just barely two minutes completed when we were cleared onto the runway for takeoff. So; while completing the check and returning the engine bleed switch to on and the X bleed switch back to automatic; we got an ECAM for pack 2. I quickly glanced at the procedure again and read that it said to turn pack 2 off; so I turned off pack 2; and the ECAM went away. Quickly; we ran through ECAM completed and screens normal; completed the before takeoff checklist; and then completed a normal takeoff. However; after leveling off; we returned to the written procedure check and determined that pack switch should have only been turned off if the precooler outlet temperature exceeds 240 degrees celsius within 2 minutes after x-bleed valve opening. We then returned the pack switch to on without any issues. As we started our descent we ran the procedure again for low power settings by again turning the engine bleed switch off and X bleed switch to open. The descent and approach and landing were normal. Overall the procedure was confusing and should have been clarified beforehand.
Original NASA ASRS Text
Title: A319 pilot reported making a mistake with the aircraft's packs because of an unclear checklist.
Narrative: After starting engine number 2 on taxi; we ran the maintenance check procedure for MEL [for] OPS PLACARD. DEFECT: ENGINE HIGH PRESSURE VALVE INOPERATIVE AND SECURED CLOSED.The check was normal. However; we had just barely two minutes completed when we were cleared onto the runway for takeoff. So; while completing the check and returning the ENG bleed switch to on and the X Bleed switch back to AUTO; we got an ECAM for Pack 2. I quickly glanced at the procedure again and read that it said to turn Pack 2 off; so I turned off pack 2; and the ECAM went away. Quickly; we ran through ECAM completed and screens normal; completed the before takeoff checklist; and then completed a normal takeoff. However; after leveling off; we returned to the written procedure check and determined that pack switch should have only been turned off if the PRECOOLER OUTLET TEMPERATURE EXCEEDS 240 DEGREES CELSIUS WITHIN 2 MINUTES AFTER X-BLEED VALVE OPENING. We then returned the pack switch to on without any issues. As we started our descent we ran the procedure again for low power settings by again turning the engine bleed switch off and X bleed switch to open. The descent and approach and landing were normal. Overall the procedure was confusing and should have been clarified beforehand.
Data retrieved from NASA's ASRS site 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.