Which indicator on the EICAS page indicates a drop in MGB oil pressure?

Which indicator on the EICAS page indicates a drop in MGB oil pressure?

• A. MGB OIL P
• B. Low MGB oil pressure
• C. MGB PMP MAIN
• D. MGB oil pressure at zero

Answer: (A)

The key idea is that the EICAS display uses a direct readout for the Main Gearbox oil pressure, labeled MGB OIL P. This readout shows the actual pressure value in the gear case, so when the pressure begins to fall, the number on this indicator drops accordingly and you may see a caution or warning if it goes below limits. The other labels describe conditions or equipment status rather than the current pressure value: a warning like “Low MGB oil pressure” is an alert that triggers when the pressure is too low, not the measurement itself; a pump-status indicator (MGB PMP MAIN) tells you whether the pump is operating, not the pressure level; and a label such as “MGB oil pressure at zero” would describe a specific extreme condition rather than the ongoing pressure reading. So the direct MGB OIL P indicator is the one that shows the drop in oil pressure.

The key idea is that the EICAS display uses a direct readout for the Main Gearbox oil pressure, labeled MGB OIL P. This readout shows the actual pressure value in the gear case, so when the pressure begins to fall, the number on this indicator drops accordingly and you may see a caution or warning if it goes below limits. The other labels describe conditions or equipment status rather than the current pressure value: a warning like “Low MGB oil pressure” is an alert that triggers when the pressure is too low, not the measurement itself; a pump-status indicator (MGB PMP MAIN) tells you whether the pump is operating, not the pressure level; and a label such as “MGB oil pressure at zero” would describe a specific extreme condition rather than the ongoing pressure reading. So the direct MGB OIL P indicator is the one that shows the drop in oil pressure.