W DOC AIRBUS | MMEL OPS PROC

Power Transfer Unit (PTU)

29-23-01APower Transfer Unit (PTU)
Applicable to: -
- After engine start
Check of the PTU operation:
  • GREEN ENG 1 PUMP pb-swOFF
On the HYD SD Page, check that the green system pressure is correct.
A correct pressure is 3000 PSI (± 200 PSI).
  • GREEN ENG 1 PUMP pb-swOn
  • YELLOW ENG 2 PUMP pb-swOFF
  • YELLOW ELEC PUMP pb-swOff
On the HYD SD Page, check that the yellow system pressure is correct.
A correct pressure is 3000 PSI (± 200 PSI).
  • YELLOW ENG 2 PUMP pb-swOn
Note:
  1. The PTU pressurizes the system to a nominal value of 3000 PSI (± 200 PSI), but if no consumers are operated the pressure is not constant. The PTU operates in a cycle which keeps the pressure in the hydraulic systems between 2100 PSI and 3200 PSI.
  2. For passengers comfort, the PTU may be set to OFF during the taxi after landing provided that both engines hydraulic pumps are operative and running. The PTU must be set back to AUTO before leaving the aircraft.
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