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1. DEVICES OPERATED
BY
HYDRAULIC SYSTEM
IN
AIRCRAFT
LECTURER’S NAME: DR.SOFIAN MOHD
Group Members: 1) AMIRUL IMAN BIN HASRI AD110155
2) JASWANT SINGH BAL AD110177
3) AMAL IQMAL BIN ADNAN AD110189

2. AIRCRAFT HYDRAULIC SYSTEM
 A crucial component to operate modern aircraft (mainly
for large commercial airplane).
 Helps to ease the work of controlling an aircraft without
concerning on sloppiness.
 Create large/unlimited force by exerting minimal
strength on control system (compared with other fully
mechanical operated aircraft)

3. PARTS OF AIRCRAFT
USES
HYDRAULIC SYSTEM

4. SECONDARY UTILITY SYSTEM
PRIMARY FLIGHT FLIGHT
CONTROL (OTHER PARTS OF
CONTROL AN AIRCRAFT)
• Elevator • Flaps • Landing gear
• Rudder • Spoiler • Brakes
• Ailerons • Slats • Gear steering
• Cargo stairs
• Passenger stairs

5. COMPLEX HYDRAULIC SYSTEM

6. TYPES OF AIRCRAFT
1.Single engine aircraft
DIAMOND DA-40
2. Military aircraft
F22 RAPTOR
3.Commercial Airlines
plane
 BOEING 737

7. Diamond DA-40

8. Cable System

9. Landing gear
• Uses tricycle landing gear
• Fixed landing gear which does not require any
hydraulic system
Braking system
• Disc brake system which similar to other land
vehicle
• Hydraulic fluid : Mil-H-83282
• Type of hydraulic pump : Vane pump
Gear steering, Cargo door, Passenger door
*Similar to commercial airplane and light aircraft*

10.  Cable or high steel rod used as flight control.
 Low cost.
 Cable is strong enough to flight control.
 Cable is made from strong and high tension string.
 If hydraulic used, might be not efficient for the performance of DA-40
because strength to weight ratio is really important to make an aircraft
fly.
 Sometimes light aircraft is equipped with hydraulic system, if then, the
pressure used of that such aircraft is around 1000psi and below.
 Mineral-base Fluid
 MIL-H-5606

12. Boosted control system
This is a simplified boost system. When the pilot moves the column,
tension in the cable or rod also opens a valve letting pressure from a
hydraulic or pneumatic pump expand a slave cylinder that assists
moving the control. The control column can be moved by raising and
lowering the elevator but a considerably more force is required.
Booster Assemblies
The booster system is designed so that the pilot has a normal feel of
control forces when hydraulic pressure is available to the booster
cylinders. Hydraulic flight control boosters operated by both hydraulic
systems are incorporated in each of the three surface control system.

13. MILITARY
AIRCRAFT
(F-22)

14. Landing gear
• Similar landing gear with a commercial
aircraft, which is tricycle landing gear.
• Slight difference in type of hydraulic
system used to generate power to
operate the landing gear, due to jet
fighter flexibility and speed in
performance.
•Hydraulic fluid : Exxon Hyjet V (Type V)
•Type of hydraulic pump : Piston pump

15. F-22 Raptor (Military Aircraft)
 Hydraulic system with more than 4000psi.
 Thick hose
 The hydraulic system includes four 72 gallon-per-minute pumps
and two independent 4,000 psi systems.
 Large power pump and accumulator.
 It exposed with high speed so require more energy.
 Sometimes require large reservoir.
 Hydraulic fluid used is such type of Synthetic Fluid
 MIL-H-83282.
 Non-petroleum base hydraulic fluid for use in high performance
piston engine and turbine powered aircraft.

16. COMMERCIAL
AIRPLANE
(BOEING 737)

17. Utility system
Landing gear
 Previously , cable system was introduce in
the early days to operate landing gear
system. Due to lack in efficiency, hydraulic
system was widely use these days.
 An easy working principle, with a push of
button ,the landing gears can be set to
radial movement of gears that is powered
up by hydraulic system to steady state of
take-off or during/after landing.
 Fluid used for this hydraulic system is
:Skydrol 5
 Hydraulic pump used in this part of system
is : Piston pump

18. Brakes
 Use to reduce aircraft speed
on ground
 Fully functional with hydraulic
system (conventional brake
drum is no longer in use)
 Fluid used : Exxon type 4
 Type of hydraulic pump used :
Vane pump

19. Gear steering, Cargo door,
Passenger door
 Fully functional with
hydraulic system
 Fluid used :Exxon type 4
 Type of hydraulic pump :
Vane pump

20. Braking system
• Used to reduce airplane speed ,no means of
cable
• Fully functional hydraulic system
•Hydraulic fluid : Exxon Hyjet V (Type V)
•Type of hydraulic pump : Piston pump
Gear steering, Cargo door, Passenger door
*Similar to commercial airplane and light aircraft*

21. Empennage hydraulic system
 -Empennage need hydraulic system
because of the efficiency of system
compared to cable or steed rod
connected to empennage.
 -The fluid that used for empennage
hydraulic system is DTD585. This
fluid is most suitable for this system
because of the pump use for this
hydraulic not required large force
compared to other.
 -That fluid also cannot expands due to
high temperature.
 -The pump used for this hydraulic is
really small than in aileron part.

22. Boeing 737
 Most commercial airliners planes using in range 3000 to
4000 psi systems (although some new military aircraft
have made the move to 5000 psi) of hydraulic system.
 Therefore , piston pump is used to control hydraulic fluid
flow through Boeing 737 hydraulic system
 Synthetic based fluid is used to run the system which is
Exxon type 4

23. HYDRAULIC SYSTEM
IN THE WINGS

24. WINGS

26. FLAPS

28. AILERONS

29. B737 AILERONS SCHEMATIC

30. SLATS

31. B737 Flaps & Slats Schematic Diagram

32. SPOILERS

33. B737 SPOILERS SCHEMATIC

34. THANK YOU!