29 Hydraulic Power

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TTP

B1-L3

ATA 29

Beech 90 Series

B2-L2

Hydraulic Power

An electrically-controlled hydraulic powerpack extends and retracts the main and nose landing gear assemblies. The landing gear assemblies comprise the following:

•  Hydraulic powerpack

•  Tubing

•  Reservoir

•  Hydraulic actuators

•  Brake system

•  Accumulator

•  Hydraulic fluid level sensor system

 

        The main and nose landing gear assemblies extend and retract hydraulically. Primary com- ponents of the  landing gear hydraulic system include a hydraulic powerpack and hydraulic actuators on each landing gear. Powerpack pressure normally drives the hydraulic actuators.

        Three hydraulic lines supply pressure to the nose and main gear actuators. A pressure line from the powerpack provides the normal landing gear extension. A second line provides normal retrac- tion. The third line provides manual or emergency extension  using  a  cockpit-mounted  hydraulic hand pump. On the main gear, the retract hoses connect to the bottom of the actuators. On the nose gear, the retract hose connects to the actuator via a swivel fitting that passes through the actua- tor support assembly. The extend and emergency extend hoses connect to the top of each actuator



Fill Reservoir

A fill reservoir, just inboard of the left nacelle and forward of the front spar, contains a cap and dipstick assembly, marked HOT/FILL–COLD/ FILL, to maintain the system fluid level. The fill reservoir is  pressurized to 18-20 psi from the pneumatic system. The vent line orifice from the fill reservoir requires periodic cleaning.

 

Powerpack

The hydraulic powerpack is just forward of the main spar in the cabin center aisle beneath the floorboards. This powerpack includes the following components:

•  Hydraulic pump

•  28-VDC motor

•  Primary and secondary reservoirs

•  Filter screens

•  Gear-up selector solenoid

•  Gear-up pressure switch

•  Low fluid level sensor




PTP 

Beech 90 Series

B1

LOC

FOT

SGH

R/I

MEL

TS

B2

LOC

FOT

SGH


MEL


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