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Fokker 50-Hydraulics

The aircraft has a single hydraulic system for operating landing gear, nose steering, brakes and flaps. The system includes two engine-driven pumps, one electrically-driven pump, a pressurized tank, fire valves, and an accumulator. A failure will be detected and alerts presented on the HYDRAULIC panel. The engine pumps supply 3000 psi nominal pressure. An electrical pump is for maintenance testing and pre-engine start brake pressurization. In a total failure, normal operation of landing gear, nose steering, brakes and flaps is not possible, with alternate procedures in sections. Fire handles isolate the affected engine pump.

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416 views3 pages

Fokker 50-Hydraulics

The aircraft has a single hydraulic system for operating landing gear, nose steering, brakes and flaps. The system includes two engine-driven pumps, one electrically-driven pump, a pressurized tank, fire valves, and an accumulator. A failure will be detected and alerts presented on the HYDRAULIC panel. The engine pumps supply 3000 psi nominal pressure. An electrical pump is for maintenance testing and pre-engine start brake pressurization. In a total failure, normal operation of landing gear, nose steering, brakes and flaps is not possible, with alternate procedures in sections. Fire handles isolate the affected engine pump.

Uploaded by

DVS
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Fokker 50 - Hydraulics

GENERAL

The aircraft has a single hydraulic system for operation of the landing gear, nose wheel
steering, brakes, and flaps. The main components are a tank; two engine driven pumps (one
per engine), and an electrically driven pump. Additionally, fire shut-off valves and an
accumulator are incorporated. The system is controlled from the HYDRAULIC panel. Failures
will be detected and the relevant alerts are presented.

SYSTEMS

Hydraulic tank

The tank is pressurized by engine bleed-air and is equipped with a fluid quantity transmitter.
Additionally, low fluid quantity, fluid overheat, and low tank air pressure are signaled.

Engine driven pumps

Hydraulic power is supplied at a nominal system pressure of 3000 psi by the engine driven
pumps. One pump is sufficient to supply all hydraulic power requirements.

Electrically driven pump

A low capacity electrically driven pump is installed. Its main purpose is for maintenance
system testing. It can be used to pressurize the brake system prior to engine starting.

FAILURES

If a total hydraulic system failure occurs, normal operation of the landing gear, nose wheel
steering, brakes, and flaps is not possible. (Detailed information for alternate operation is
given in the appropriate sections). When a fire handle is pulled the relevant fire shut-off valve
closes. This will isolate the affected engine driven pump from the tank supply.

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Fokker 50 - Hydraulics

FUNCTIONAL DIAGRAM

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Fokker 50 - Hydraulics

ALERTS

CONDITION(S) / LEVEL AURAL MWL/MCL CAP LOCAL

ENG PUMP

FAULT
ENGINE PUMP FAULT 2
CAUTION

LOW FLUID QUANTITY 2 LO QTY

CAUTION

FLUID OVERHEAT 2 OVHT

CAUTION

LOW TANK AIR 2 TANK PR


PRESSURE
CAUTION

DOUBLE ENGINE PUMP


FAULT+INTEGRATED 2 HYDR SYST
ALERTING SYSTEM IN
BACKUP MODE

Page 3

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