Shared Flashcard Set

Details

Hyadrulics AM SCHOOLHOUSE
AM hydraulic section
46
Mechanical Engineering
Not Applicable
12/30/2014

Additional Mechanical Engineering Flashcards

 


 

Cards

Term
Units operated by hydraulics on aircraft
Definition
Landing gear, wing flaps, control surfaces, wing folding mechanisms, bomb-bay doors, brakes.
Term
Disadvantages of hydraulics
Definition
Leakage and contamination
Term
Characteristics of hydraulics
Definition
1)Extremely efficient, 2)favorable weight,
3)"smooth, flexible, uniform action without vibration", 4)maintenance is relatively simple
Term
State parts of a BASIC hydraulic jack, and in order starting with pump.
Definition
Pump to check valve, then to actuating cylinder, passes manual bypass valve, then to reservoir, passes another check valve, back to pump
Term
Determine the FAP triangle
Definition
F=A*P
A=F/P
P=F/A
Term
SAFETY: Before working on any hydraulics system, make sure.....
Definition
All pressure has been relieved
Term
List 5 basic components that makeup a HYD system
Definition
Pump, actuating unit, reservoir, selector valve, and hydraulic lines
**BASIC FOR HYDRAULIC SYSTEMS**
Term
The pump does what?
Definition
Creates flow of fluid
Term
The reservoir does what?
Definition
Hold supply of fluid and has *space for thermal expansion*
**CAN BLEED AIR FROM THE SYSTEM**
Term
The selector valve does what?
Definition
Directs flow of fluid to the actuating unit and *determines which direction it will be moved*
Term
What does the actuating cylinder do?
Definition
Converts fluid energy in to mechanical motion
Term
What is hydraulic contamination?
Definition
Presence of undesirable foreign matter that May or may not be visible to the unaided eye.
Term
What is the objective of the HYD fluid contamination control program?
Definition
*To achieve and maintain a satisfactory level of purity in HYD systems* = *providing safe and efficient operation of naval aircraft and support equipment.*
Term
Two GRAND classifications of contamination
Definition
.Particulate & Fluid.
Term
3 types of PARTICULATE contamination
Definition
Organic
Metallic solid
Inorganic solid
Term
PARTICULATE, organic definition
Definition
Solids or semi solids that come from wear or chemical reactions of O-rings, seals, or gaskets.
When lots of particles from, it creates **SLUDGE**
Term
PARTICULATE, metallic solid definition
Definition
Almost always present in HYD systems. Mostly come from HYD pumps due to continuous high speed internal movement
Term
PARTICULATE, inorganic solid definition
Definition
Dust, paint particles, dirt, and **glass particles(silicates)**
EXTREMELY UNDESIRABLE
Term
FLUID, air contamination definition
Definition
May be introduced through improper maintenance. Creates **FOAM**
**^^ENTRAINED^^**
Term
FLUID, water contamination
Definition
Separates from HYD fluid and collects in filter bowls and at other critical locations. May result in formation of ice or corrosion from oxidation. May clog filters
Term
FLUID, solvent contamination definition
Definition
Fluid that is a chlorinated solvent, if introduced with any water in a HYD system, could form highly corrosive acids.
Term
FLUID foreign fluids contamination definition
Definition
Rare, generally a result of lube oil, engine fuel, or incorrect HYD fluid having been introduced during servicing. Can be verified once suspected with a chemical analysis of a fluid sample
Term
Micron
Definition
Millionths of a meter, one micron is **equivalent to 0.0000394 inch.**
**25,400 microns = to 1 inch.**
Term
Preferred method of testing contamination...
Definition
Particle counting= sample sent to a lab (I level) or NOAP lab. A report will be sent back from the lab
Term
Alternate contamination testing
Definition
Patch test. Through an analysis kit reference the NAVAIR 01-1A-17
The maximum level of acceptability for contamination is 200 parts per million
Term
What is the maximum acceptability for contamination using the patch test method?
Definition
200 parts per million
Term
Name 4 methods of decontamination
Definition
1)recirculating
2)purifying
3)flushing
4)purging
Term
What are the desired characteristics for HYD fluid?
Definition
Low viscosity
Lubricating qualities
Corrosion stability
Term
Name two types of HYD the military uses
Definition
(MIL-PRF-83282)- fire resistant and is primary fluid.
(MIL-H-46170 TYPE II)- preservative for HYD system in storage and used in testing.
Term
Name the two types of reservoirs
Definition
Pressurized and non-pressurized
Term
For reservoir maintenance--
Procedures and precautions must be observed in the ____ and on the _____ or________.
Definition
MIMs, placard, information plate
Term
What is a primary concern when servicing HYD reservoirs?
Definition
Cleanliness
Term
Where can the pressurized reservoir be located on an aircraft?
Definition
Anywhere before the pump in a HYD sys.
Term
Purpose of a HYD pump and where is it located?
Definition
Purpose: to create locate flow of fluid.
Location: determined by the source of power
Term
**Location of HYD pump continued**

Where is it located when the source of power is the 1)aircraft engine, 2) electric motor, 3) emergency ram-air turbine
Definition
1) mounted on the engine accessory-drive section
2) anywhere In the aircraft
3) located on the emergency power package or mounted to the ram-air turbine.
Term
Name the 4 types of HYD pumps
Definition
1)Gear pump, 2)piston pump, 3)vickers seven-piston, 4) vickers nine-piston
Term
What are the two classifications of HYD pumps
Definition
Constant displacement
(Gear pump or piston pump)
Or
Variable displacement
(Vickers 7-9 piston pump)
Term
With HYD pumps, where is maintenance done?
Definition
Pump repair is done at I level.
Gasket replacement can be done at O level.
Term
**What is the purpose of shear shaft in the drive shaft? **
Definition
**To prevent damage to the power source of the pump in the event of pump binding**
Term
HYD filters purpose and location.
Definition
Purpose: to filter the fluid of the HYD system of foreign particles.
Location: placed as needed throughout the system
Term
List the 3 parts that makeup a HYD filter.
Definition
Head assembly, bowl, and element.
Term
What are the 3 pubs for HYD filter maintenance
Definition
MIMs: servicing filters
MRCs: inspection info
Aviation Hydraulics Manual: cleaning and testing info for elements
Term
State the purpose of a hydraulic relief valve
Definition
To protect the HYD system from damage that could result from excessive pressure caused by failure of the pump regulating devices, thermal expansion, and pressure surges.
Term
Name two types of relief valves.
Definition
Thermal and main system
Term
How do main system relief valves work and where are they located?
Definition
They release HYD fluid from the pressure line into a return line.
Located in the pressure line after the regulator, and if *no regulator then after the pump*
Term
How do thermal relief valves work and where are they located?
Definition
They relieve excessive pressure caused by thermal expansion .
Located where a check valve or selector valve prevents pressure from being relieved.
**in subsystem or unit system**
Supporting users have an ad free experience!