ISSUE DESCRIPTION
- The HYD AUX PUMP should only show a white box with “OFF” when selected OFF on the overhead panel. It should normally show a green box with “STBY”. Also the bus supplying the AUX PUMP should be shown, not only when the pump is running.
- When pressing the AUX pump pushbutton, the pump should appear active with a blue box (not green).
- Observe hydraulic pressure lost in seconds after pump stops running, pressure should be kept and slowly drop over 10 to 20 minutes (true for blue and green system).
FREQUENCY OF ISSUE
Always.
REPRODUCTION STEPS
- With engines off, and AUX PUMP selected ON on the overhead panel, observe OFF instead of STBY displayed.
- Now press the AUX PUMP PB and observe a green running symbol instead of blue.
- Observe bus is only displayed when the AUX pump is running.
- Observe hydraulic pressure is lost instantly upon pumps stop running.
YOUR SETTINGS
Not relevant.
MEDIA
Hydraulic AUX PUMP showing OFF instead of STBY, bus missing:
AUX PUMP PB pressed, symbology green instead of blue, bus shown:
What it should look like (STBY), bus shown:
Pressing the AUX PUMP pushbutton (blue):
Nosewheel steering should show in amber if NWS is selected OFF, even if blue pressure is available. PROP BRK should become amber when pressure is lost before the rest (2100 psi, the rest becomes amber at 1500 psi).
