Hydraulic Systems Flashcards

1
Q

NORMAL HYD PUMPS ON Sequence?

A

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
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2
Q

We turn on the HYD PUMPS prior to ENG START in sequencing order for what purpose?

A

Prevents fluid transfer from C to R HYD SYS via shuttle valves.

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3
Q

HYD COMPONENTS by SYSTEM?

A

LEFT:

  • FLT CONT

RIGHT:

  • FLT CONT
  • NORM BRAKES
  • PES

CENTER:

  • FLT CONT
  • FLAPS/SLATS
  • TAILSKID
  • HDG
  • ALT BRAKES
  • NOSE STEER
  • GEAR
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4
Q

When is ENG HYD PUMP depressurized?

A
  1. PUMP Switch OFF
  2. ENG FIRE Switch Pulled

* associated L HYD PRIM PUMP EICAS

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5
Q

Do we normally de-select ENG HYD Pump Switches?

A

NO

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6
Q

L/R HYD SYS PRESS light?

A

LOW overall SYS PRESS

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7
Q

C ELEC HYD PUMPS operation with single power source?

A

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>

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8
Q

C HYD RSV low, what happens to system with regards to C ELEC HYD PUMP #1 (below standpipe fluid)?

A

Valves will direct flow of all fluid from C1 Pump to:

  • Alternate Brakes
  • Nosewheel Steering
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9
Q

C HYD SYSTEM air driven pump pneumatically supplied via?

A

C BODY DUCT*

<em>*C ISLN VLV closed will restrict pneumatic air to ADP (HDG INOP)</em>

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10
Q

When will RAT provide pressure to the C HYD SYS?

A

Dual ENG FAIL in flight.

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11
Q

What does RAT provide HYD PRESS to?

A

C HYD SYS Flight Controls

<em>C AP remains available with electric power</em>

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12
Q

Cockpit indication that RAT has been deployed?

Min airspeed for PRESS?

A
  • UNLKD on RAT Switch
  • 130KTS
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13
Q

When is RAT auto-deployment inhibited?

A

Below 80KTS on GND.

Can still be deployed manually.

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