User manual

Section 12.29 Part B
06 ACCUMULATORS
Two accumulators of 5 inches and 10 inches diameter hold operating pressure for the
hydraulic system.
The 5-inch accumulator supplies initial pressure to the Gear to release it from the locks.
The Hydraulic Pump is required to operate the remainder of the Gear cycle because of the
fluid volume and pressure required. Emergency gear operation can be achieved by using
the electric or hand pumps should the Engine Hydraulic Pump fail, or the Gear can be
lowered manually
The brake system accumulator of 10 inches holds sufficient pressure for 5 to 6 brake
applications giving a measure of safety should the pumps fail.
Recharging depleted hydraulic pressure can be by use of the electric pump or the hand
pump if fluid still remains in the system.
07 HYDRAULIC FILTER
The Filter is located in the Nose compartment. The filter handle should be rotated once per
day as pan of the preflight checks. This clears accumulated contamination from the filter
screens, which are then cleaned at inspection times.
08 ELECTRIC AUXILIARY HYDRAULIC PUMP
The Auxiliary Pump is located behind the co-pilot’s seat.
The pump consumes considerable electrical power. It is connected directly to the Main
Distribution Panel while its control (switch) power is fused by circuit breaker on the Co-
Pilots Electrical Panel. The control switch is on the Yoke.
The Auxiliary Pump is powerful enough to carry out all hydraulic functions satisfactorily.
The pump is to switched off when not required because of the heavy drain on the electrical
system.
09 EMERGENCY HYDRAULIC HAND PUMP
The emergency hand pump is situated on the floor between the two Pilots. It is activated
by inserting it's handle into the socket and pumping fore and aft vigorously. Provided fluid
remains in the hydraulic system all normal hydraulic procedures can be completed by
using the pump.
The Emergency Hand pump handle is stowed behind the Co-Pilot's seat when not in use.
The handle can be inserted into its socket during the Pre Flight checks and may be left
there for the duration of the aircraft operation. It should be in place during critical phases of
flight.
Hand pump operation is not subject to Pressure Relief Valve protection. It draws its supply
of hydraulic fluid directly from the tank, and discharges directly into the Hydraulic System
bypassing the pressure relief valve. It is therefore possible to over pressurize but the
forces required are considerable.
Rev No: 00 Stichting Catalina PH-PBY
Page: 2 18 May, 2004