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A captain questions maintenance control about their deferral of a cockpit control switch for number 1 engine's green hydraulic system engine driven pump (edp) on an A320 aircraft. Captain noted that if the green system lost hydraulic fluid; the pump would be uncontrollable and the inability to turn off the pump affects the ability to carry numerous green system fault checklists.
| Attributes | |
| ACN | 1103499 |
| Time | |
| Date | 201307 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Hydraulic System Pump |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 276 Flight Crew Total 15400 Flight Crew Type 6565 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Deviation - Procedural MEL |
Narrative:
This A320 aircraft had a deferral (DF) with the narrative of the green system hydraulic pump cockpit switch [was] inoperative (inop); in that it could not turn off the green system hydraulic pump. It had been DF'd a few days prior in ZZZ1. Since the green system pump is a major aircraft system and the ability to turn it off; directly affects the ability to carry numerous green sys fault checklists; I was concerned with the DF. A call to maintenance control to question the deferral (DF) led to my call to the dispatch desk to refuse the aircraft. If the [green] system lost [hydraulic] fluid the pump was uncontrollable and I felt this could lead to catastrophic results in relation to engine-1. Further questioning of maintenance control led me to believe that the MEL used for the DF had been fairly loosely translated to apply to this malfunction. The gate mechanic said the switch was not the problem; but the actual solenoid on the [engine driven hydraulic] pump itself. From start to end of this event; I could not fathom why this aircraft had been DF'd at all. As maintenance control said later; glad we [flight crew] caught it before an airborne incident happened. I couldn't agree more.
Original NASA ASRS Text
Title: A Captain questions Maintenance Control about their deferral of a cockpit control switch for Number 1 Engine's Green Hydraulic System Engine Driven Pump (EDP) on an A320 aircraft. Captain noted that if the Green System lost hydraulic fluid; the pump would be uncontrollable and the inability to turn off the pump affects the ability to carry numerous Green System fault checklists.
Narrative: This A320 aircraft had a Deferral (DF) with the narrative of the Green System Hydraulic Pump cockpit switch [was] inoperative (inop); in that it could not turn off the Green System Hydraulic pump. It had been DF'd a few days prior in ZZZ1. Since the Green System pump is a major aircraft system and the ability to turn it off; directly affects the ability to carry numerous Green Sys fault checklists; I was concerned with the DF. A call to Maintenance Control to question the Deferral (DF) led to my call to the Dispatch Desk to refuse the Aircraft. If the [Green] System lost [hydraulic] fluid the pump was uncontrollable and I felt this could lead to catastrophic results in relation to Engine-1. Further questioning of Maintenance Control led me to believe that the MEL used for the DF had been fairly loosely translated to apply to this malfunction. The gate Mechanic said the switch was not the problem; but the actual solenoid on the [Engine Driven Hydraulic] pump itself. From start to end of this event; I could not fathom why this Aircraft had been DF'd at all. As Maintenance Control said later; glad we [flight crew] caught it before an airborne incident happened. I couldn't agree more.
Data retrieved from NASA's ASRS site as of July 2013 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.