Systems - Hydraulics Flashcards
How many hydraulic systems?
Two Hydraulic Systems With Two Engine Driven Hydraulic Pumps
How are reservoirs pressurized?
8th Stage Bleed Air from Engines
Airframe Mounted Gear Box
Powers Hydraulic Pumps
Left Engine Powers the
3,000 PSI Utility System
Right Engine Powers the
3,000 PSI Flight Control System
Pressure Indicators and Caution Lights are
Independent to Each System
Flight Control Hydraulics consist of
Flight controls
Utility Hydraulics consist of
FANGS
- Flight Controls
- Augmentation (SAS)
- Nose Wheel Steering
- Gear Extension/Retraction
- Speed Brake
Pressure Indicators powered by
AC
Low Pressure
1,500 PSI Illuminates and 1,800 PSI is Needed to Terminate
- 35 Minutes If Either System Reads 0 PSI
High Temperature
Normal Temperature is Needed to Terminate
- Caused by Faulty Pressure Regulator or Line Restriction
Airframe Mounted Gearbox
Operates Hydraulic Pump and AC Generator
- Shift Mechanism Maintains AC Output Between 320 and 480 Cycles Per Second
- Gearbox Shift Occurs Between 65% and 75% RPM
Rudder System Trim
Provides 2° Deflection, Only Operable with SAS in YAW DAMPER
Rudder Limiter
- Nose Gear is ¾ or Less Extended, Rudder Deflection is Limited to 6° From Neutral in Either Direction
- Nose Gear is More than ¾ Extended, Full Rudder Deflection of 30° From Neutral in Either Direction
Trim System
- AC Motors
- Takeoff Trim System Sets the Horizontal Tail Trim to the Optimum Takeoff Setting
- When the Push button is Held, the Motor Will Move the Trim Until the Neutral Trim Light Illuminates
What does the Stability Augmenter System do?
Uses Utility Hydraulic System to Position the Rudder to Reduce Yaw Oscillations
How is SAS turned on and off?
EGI Mode Switch on the AAP
Manual Rudder Trim is Accomplished Through the
Yaw Damper
How is flap system operated?
Two AC Electric Motors
Interconnected by a Rotary Flexible Shaft
- If One Flap Motor Fails, Both Flaps are Actuated Through the Rotary Shaft
- Flap Extension Time is Much Longer With One Motor Failed
What does Flap-Horizontal Tail Interconnect System (FLAP-SLAB) do?
- Maintains Aircraft Handling Qualities Regardless of Flap Position
- Majority of Compensation Occurs in the First 35% of Flap Deflection
- Interconnect System:
- Repositions Horizontal Tail to Eliminate Pitch Changes Caused by Flap Movement
- Increased Horizontal Tail Deflection in Nose Down Direction When Flaps are Lowered
- Increases the Amount of Horizontal Tail Deflection Per Inch of Stick Travel
Flaps Lever and Position Indicator
- Levers are Mechanically Interconnected by Cables
- FCP Lever Actuates the Electrical Switch that Operates the Two Flap Motors
= Position Indicator Operates on DC Power and Reflects Right Flap Position Only
Auxiliary Flap Control Switch
- Provides NORM and EMER Positions of the Flaps
- NORM – Provides Flap Settings of 0%, 60%, and 100%
- EMER – Provides Any Flap Setting Specified by the Flap Lever
How is speed brake powered?
DC Controlled, Hydraulically Activated Dual Surface Speed Brake
Provides ____ Speed Brake Positions Other Than Fully Extended
Intermediate
Speed brake: Three Position Switch
EXTEND – OFF – RETRACT
The RCP Speed Brake Switch Can ____ the FCP Switch, But is Spring Loaded to the OFF Position
Override
- For FCP To Regain Control, Move Switch to OFF Then Back to Appropriate Position
Speed Brake Creep Can Be Prevented By
Setting FCP Speed Brake Switch to the Same as RCP
Speed brake: What happens if you have DC failure?
SB is immovable
NWS is ____ once alternate gear extension used
Unavailable
Nosewheel Steering Switch (NWS)
- Electrically Controlled by the Nosewheel Steering Switch on the Stick
- Nosewheel Steering is Deactivated When Throttles are Advanced to MAX
- Automatically Deactivates While Weight is Not on the Nosewheel
Wheel Brake System
- Segmented Rotor Type Brakes
- Powered by a Separate, Completely Self-Contained Hydraulic System
- Each Brake Pedal Controls a Hydraulic Master Cylinder
- Control of the Brakes Transfers to the Crew Member Applying More Force
- End of Life Indicated by Top of the Nut Being Less Than Flush With the Top of the Cylinder
