NORMAL HYD PUMPS ON Sequence?
R ELEC: AUTO
- SYS PRESS + PRESS Extinguish
- BRAKE SOURCE Extinguish
C ELEC 1-2: ON
- SYS PRESS + C1/C2 PRESS LIGHT Extinguish
L ELEC: AUTO
- SYS PRESS + PRESS Extinguish
- C2 PRESS Re-illumes (load shed)
C ADP: AUTO
- PRESS LIGHT Extinguish
We turn on the HYD PUMPS prior to ENG START in sequencing order for what purpose?
Prevents fluid transfer from C to R HYD SYS via shuttle valves.
HYD COMPONENTS by SYSTEM?
LEFT:
- FLT CONT
RIGHT:
- FLT CONT
- NORM BRAKES
- PES
CENTER:
- FLT CONT
- FLAPS/SLATS
- TAILSKID
- HDG
- ALT BRAKES
- NOSE STEER
- GEAR
When is ENG HYD PUMP depressurized?
- PUMP Switch OFF
- ENG FIRE Switch Pulled
* associated L HYD PRIM PUMP EICAS
Do we normally de-select ENG HYD Pump Switches?
NO
L/R HYD SYS PRESS light?
LOW overall SYS PRESS
C ELEC HYD PUMPS operation with single power source?
If both C ELEC PUMPS are ON, the #2 pump is inhibited to reduce electrical load.
<em>* PRESS light illumes until second power source online</em>
C HYD RSV low, what happens to system with regards to C ELEC HYD PUMP #1 (below standpipe fluid)?
Valves will direct flow of all fluid from C1 Pump to:
- Alternate Brakes
- Nosewheel Steering
C HYD SYSTEM air driven pump pneumatically supplied via?
C BODY DUCT*
<em>*C ISLN VLV closed will restrict pneumatic air to ADP (HDG INOP)</em>
When will RAT provide pressure to the C HYD SYS?
Dual ENG FAIL in flight.
What does RAT provide HYD PRESS to?
C HYD SYS Flight Controls
<em>C AP remains available with electric power</em>
Cockpit indication that RAT has been deployed?
Min airspeed for PRESS?
- UNLKD on RAT Switch
- 130KTS
When is RAT auto-deployment inhibited?
Below 80KTS on GND.
Can still be deployed manually.
