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B777 flight crew reported unknowingly accepting maintenance direction from the local mechanic rather than maintenance control.
| Attributes | |
| ACN | 1588217 |
| Time | |
| Date | 201810 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZZ.Airport |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Taxi |
| Component | |
| Aircraft Component | Hydraulic Main System |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 250 Flight Crew Total 12715 Flight Crew Type 3597 |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument |
| Experience | Flight Crew Total 9960 Flight Crew Type 1473 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
Towards end of taxi out rt hydraulic quantity 1.20 of (overfill). Satcom was inop so called ops to call [maintenance control]. A mechanic called us back and told us to do a procedure to transfer hydraulic fluid from right system to the center and left systems. We did procedure and rt fluid quantity was reduced to normal. A message then came from [maintenance control] to return to the gate to fix the hydraulic problem. We were under the assumption that [maintenance control] had directed him to have us do the procedure because I asked for [maintenance control] in the first place.
Original NASA ASRS Text
Title: B777 flight crew reported unknowingly accepting maintenance direction from the local Mechanic rather than Maintenance Control.
Narrative: Towards end of taxi out rt hydraulic quantity 1.20 OF (overfill). Satcom was inop so called ops to call [Maintenance Control]. A mechanic called us back and told us to do a procedure to transfer hydraulic fluid from right system to the center and left systems. We did procedure and rt fluid quantity was reduced to normal. A message then came from [Maintenance Control] to return to the gate to fix the hydraulic problem. We were under the assumption that [Maintenance Control] had directed him to have us do the procedure because I asked for [Maintenance Control] in the first place.
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.