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B737 captain reported that a procedure to de-pressurize the hydraulic system was not noted in the MEL.
| Attributes | |
| ACN | 1546862 |
| Time | |
| Date | 201805 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Hydraulic System Pump |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 606 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural MEL Deviation - Procedural Published Material / Policy |
Narrative:
The aircraft had MEL 29-xx; system a engine driven hydraulic pump depressurization. The main note only stated to start the number 1 engine only after the tow bar is disconnected. The captain bringing the aircraft in briefed me that he had talked to maintenance and was told to also make sure that when parking the aircraft to cycle the control column to depressurize the hydraulic system (just like we do when we are to be towed into the gate). I did also call maintenance and was told the same; but wondered why this was not mentioned in the MEL description. When we parked at the gate we did so and all was well.not sure if this is just a 'technique' or suggestion from maintenance in an 'abundance of safety'; but; if this is to be done or adds to safety of the tow connecting ramp agents; it should be added to the notes in the MEL.
Original NASA ASRS Text
Title: B737 Captain reported that a procedure to de-pressurize the hydraulic system was not noted in the MEL.
Narrative: The aircraft had MEL 29-XX; System A Engine Driven Hydraulic Pump Depressurization. The main note only stated to start the number 1 engine only after the tow bar is disconnected. The Captain bringing the aircraft in briefed me that he had talked to maintenance and was told to also make sure that when parking the aircraft to cycle the control column to depressurize the hydraulic system (just like we do when we are to be towed into the gate). I did also call maintenance and was told the same; but wondered why this was not mentioned in the MEL description. When we parked at the gate we did so and all was well.Not sure if this is just a 'technique' or suggestion from maintenance in an 'abundance of safety'; but; if this is to be done or adds to safety of the tow connecting ramp agents; it should be added to the notes in the MEL.
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.