welcome…
HYDRAULIC SYSTEM - AN-32 AIRCRAFT
HYDRAULIC SYSTEM
AN-32 AIRCRAFT
HYDRAULIC SYSTEM - AN-32 AIRCRAFT
OBJECTIVE
To know about
the Hydraulic System
of AN-32 ac
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 3
OVERVIEW
General
Types
Main Hydraulic System
Auxiliary Hydraulic System
Limitations
Controls & Indicators
Diagram Of The System
Troubleshooting
References
Experience Sharing & Queries
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 4
GENERAL
The airplane hydraulic system is intended to control
the
Flaps
Landing gears
Cargo door
Emergency exits
Windscreen wipers
Engine shutdown with propeller feathering etc
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 5
TYPES
The aircraft’s Hydraulic System consists of two types
Main Hydraulic System
Auxiliary Hydraulic System
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 6
MAIN HYDRAULIC SYSTEM
Main Hydraulic System is used for
Flaps extension & retraction
Landing gear extension & retraction
Nose wheel steering
Main landing gear wheels braking
Engines shutdown & propeller feathering
Cargo door opening & closing [with ramp sliding to
under & from under the fuselage
Ventral emergency exit hatch opening & closing
Windscreen wipers drive
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 7
AUXILIARY HYDRAULIC SYSTEM
Auxiliary Hydraulic System is used for
Flaps emergency extension
Main landing gear wheels emergency braking
Cargo door opening & closing [with ramp sliding to
under & from under the fuselage
Cargo door opening & closing on ground with ramp
lowering & lifting
Ventral emergency exit hatch opening
Filling & pumping through the suction pipeline of pumps
435ɸ
Provided with hand-operated pump to build up pressure
in the cargo door control line & hydraulic reservoir
replenishment
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 8
LIMITATIONS
Capacity & Pressure
Syst Capacity - 65 ltrs
Tank Capacity - 37 ltrs
Main Syst Press - 150 kg/cm²
Emerg Syst Press - 160+20 kg/cm²
Main Hyd Accumulator Press - 145-150
kg/cm²
Main Brake Press - 100±10 kg/cm²
Emerg Brake Press - 90+15-5 kg/cm²
Park Brake Press - 60±10 kg/cm²
Hand Pump Press - 162+5 kg/cm²
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 9
LIMITATIONS
Before Start
Main Syst Press Zero - 27-28 ltrs
Main Syst Press Aval - 20-21 ltrs
Main Syst Press - 150 kg/cm²
After Start
Hyd Qty - 20 ltrs min
Hyd Press [Main & Accum] - 145-150 kg/cm²
Ops in Flt
Hyd Qty - 17-18 ltrs [L/G up]
Hyd Press [Main & Accum] - 150 kg/cm²
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 10
CONTROLS & INDICATORS
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 11
CONTROLS & INDICATORS
Ser No Description Function
Monitoring main hydraulic pumps
operation. The annunciator
‘L PUMP’ & ‘R PUMP’
01 illuminates if the hydraulic pump
annunciators [Green]
on the respective engine is
serviceable & operates properly
PUMP UNIT selector switch Electrically driven pump unit
with positions: control
02
Upper Pump on
‘Off’ Pump off
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 12
CONTROLS & INDICATORS
Ser No Description Function
‘PUMP UNIT ON’ Monitoring electrically driven
03
annunciator [Amber] pump unit operation
‘PUMP THROUGH’ selector Pumping through the suction
switch with positions: pipes of main pumps:
04
‘L’ [Left] Left pump
Neutral Pump unit OFF
‘R’ [Right] Right pump
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 13
CONTROLS & INDICATORS
Ser No Description Function
MAIN SYSTEM PRESS Monitoring pressure in the main
05
indicator hydraulic system
HYD ACCUM PRESS Monitoring pressure in the
06
Indicator hydraulic accumulator of brakes
Monitoring pressure in the
AUXILIARY SYST PRESS
07 auxiliary hydraulic system
Indicator
FLUID IN HYDR RESERVOIR Checking the quantity of fluid in
08
Indicator the hydraulic reservoir
Connecting the auxiliary
PRESS FROM AUXILIARY
09 hydraulic system to the main
HYDR SYST TO MAIN valve
system
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 14
SYSTEM DIAGRAM
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 15
TROUBLESHOOTING
Ser No Trouble Corrective Action
Pump fluid through the pump
The ‘L PUMP’ or ‘R PUMP’ suction pipeline by setting the
01 Annunciator is OFF when PUMP THROUGH selector switch
engine is being started to ‘L’ or ‘R’ [as required] for 20-
25s
With the fluid quantity in the
Control the hydraulic system & its
reservoir unchanged the
02 services in the same way as with
‘L PUMP’, ‘R PUMP’
the two pumps operating
annunciator goes out
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 16
TROUBLESHOOTING
Ser No Trouble Corrective Action
The fluid quantity as read on
the FLUID IN HYDR Use the Auxiliary Hydraulic
03 System to extend the flaps, brake
RESERVOIR indicator
decreases the wheels & open the ventral
emergency exit hatch [in
emergency], or use the brake
hydraulic accumulator to shut
Pressure read on the MAIN down the engine, brake the
SYST PRESS indicator drops wheels, & open the ventral
04
& ‘L PUMP’, ‘R PUMP’ emergency exit hatch [normally]
annunciators go out
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 17
TROUBLESHOOTING
Emergency Extension of Landing Gear: Nose Gear
• Check hyd qty & press
• Place the L/G sel sw to OFF
• Open the HYD RETURN VALVE
• Move the L/G emerg ext lvr to Upper posn; located at CP
floor
• The nose gear down annun will come ON
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 18
TROUBLESHOOTING
Emergency Extension of Landing Gear: Main Gear
• Check hyd qty & press
• Open the pannel in cargo compt Fr no 17 & move the lvr
to DOWN posn
• The main L/G green annun will come ON
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 19
REFERENCES
AN-32
FLIGHT MANUAL
& CHECK LIST
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 20
experience sharing
& queries…
………………….…
01/17/2024 HYDRAULIC SYSTEM - AN-32 AIRCRAFT 21
thank you for being with me…
HYDRAULIC SYSTEM - AN-32 AIRCRAFT
HYDRAULIC SYSTEM - AN-32 AIRCRAFT
