Airframes & Systems
T1, T2a
T1, T2a
Fichier Détails
| Cartes-fiches | 499 |
|---|---|
| Langue | Deutsch |
| Catégorie | Technique |
| Niveau | École primaire |
| Crée / Actualisé | 10.11.2014 / 01.01.2023 |
| Lien de web |
https://card2brain.ch/box/airframes_systems
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A serv0 tab moves:
opposite of the control surface which it is hinged
Single acting actuator
z.B. be Doors locks ==> moves under hydraulic pressue in one direction and in the other direction under the influence of a non hydraulic force such as a spring
Double acting actuator
the movement in either direction is due to hydraulic pressure and its controlled by means of a selector valve
The internal leak occurs when the hydraulic fluid escape
from the pressure side of a piston to the return side of the piston = decreases of the system pressure, possible loss of a hydraulic lock of the piston ==> temperature steigt ween der Mehrarbeit an
External leaks occur when ?
External leaks occur when the hydraulic fluid escapes the system from a damaged static seal or around the dynamic seal around the actuator. ==> increase in temperature
A volumetric top off valve on small aircraft typically works on the principle of:
float switches
Axial piston pumps are often used in hydraulic system due to:
their ability to produce high pressure when required but can be off loaded to reduce power consumption
If an artifical feel unit is fitted, it would ne connected
in parallel with the primary controls
The operating principle of an anti-skid system. The brake pressure will be:
decreased on the slower turning wheels
Should a hydraulic pump seize during operation:
the quill drive will shear to offload and protect the gearbox
low pressure in the system von wo?
this may be caused by loss of fluid, pump failure, or pressure filter blockage
Low level of teh fluid in teh reservoir von wo?
this may be low fluid level or low air pressure => low air pressure may cause pump cavitation
Pump low pressure von wo?
this may be caused by pump failure or drive shaft failure
Pump overheat von wo?
pump swash plate stuck in high flow position. Blockage of case drain cooling flow. Blockage of the fuel/hydraulic fluid heat exchanger
Synthetic fluids have the color?
Purple or Green
Mineral fluids have the color?
Red
In hydraulic system, a shuttle valve
enables an alternate system to operate the same actuators in case of normal system failure
Fuel is delivered to teh engine under pressure to:
prevent vapour (Gas) lock
A gust lock?
is a mechanism that locks control surfaces in place preventing random movement and possible damage of the surface from wind while parked => with no pilot holding the steering in his hands and feet on the pedals, the control surface can move freely
Which of these statements regarding most gust lock system is correct?
When the gust locks is on there is protection to prevent take-off
Viscosity is:
the tendency of a liquid or gas to resist flow
A pressure regulator is used in a hydraulic system:
in conjunction with a constant delivery type pump
On flight control systems that are operated by servo tabs teh control wheel is connected directly to the
servo tab => not to the control surface => the control surface is deflected in flight only by moving the servo tab and not the control surface itself
If a control lock is placed on teh control surface of such a sytsem, it will prevent the control surface from moving, but it will
not prevent the movement of the control wheel (Servo tab)
Hydraulic fluids must have teh following characteristics
a) thermal stability
b) low emulsifying characteristics (Emulsion=ein verteiltes Geisch zwier normalerweise nicht mischbarer Flüssigkeiten )
c) non-corrosive
d) good resistance to combustion = Verbrennung
combustion
Verbrennung
Emulsion
versteht man ein verteiltes Gemisch zweier normalerweise nicht mischbarer Flüssigkeiten ohne sichtbare Entmischung
The trim tab => hinge moment and surface efficiency?
reduces hinge moment and control surface efficiency
On a large transprt aeroplane, teh auto slat system will extend when?
extend (part of ) the slats automatically when a certain value of AOA is exceeded
An automatic cut-out valve is used in a
fixed volume pressure control hydraulic system
The damping element in a landing gear shock absorber used on large aircraft is
oil
A rudder ratio changer system reduces teh rudder deflection for a given rudder pedal deflection as teh IAS increases. Correct or inncorect
Correct
A variable stop system limits both rudder and rudder pedal deflections as teh IAS increases?Correct or inncorect
Correct
In a typical high pressure hydraulic brake system of a large transport aircraft
a separate handbrake system is usually fitted together with its own accumulator and its own system components
What is the purpose of inboard ailerons?
to reduce wing twist at high speed
The purpose of a shuttle valve is to:
supply an operating unit with the most appropriate system pressure
The purpose of an accumulator in a hydraulic system is:
to damp the fluid pressure variations
Over-tensioned cables in a flight control system could result in:
excessive (übermassig) friction in the system
One of the functions of an accumulator in a hydraulic system is:
to damp pressure surgens in the system
An under-inflated tire will
experience increased wear(Abnützung) at the shoulders
