Exam Question Flashcards
What are the things evaluated in the ACGC forum? (5)
Thermal loading Weight and balance Space configuration Antenna location EMI EMC
For hazard that is categorized as potentially causing total loss of a manned aircraft with a probability occurrence as improbable i.e. probability of occurrence lower than 1, what is the mishap risk cat, and who should be the technical endorsement authority, and the RSAF mishap risk acceptance authority respectively?
Medium risk
Technical authority: APWG
RSAF risk Acceptance authority: HAEL & HAO
What are the things that are evaluated at APWG? (3) [wrong answer]
EQT
EMI EMC
Structural strength of the modification
How is a mach cone/wave being formed?
When the object travels greater than mach 1
How does the control of rotary wing works?
Longitudinal - Cyclic Stick Lateral - Cyclic Stick Vertical - Collective Lever Pitch - Cyclic Stick Roll - Cyclic Stick Yaw - Pedals
What are the factors affecting the lift of the wing? (4) [All of the above]
angle of attack on the airfoil
wing area
velocity
geometry of airfoil
which control input changes the main rotor blade pitch angle for a conventional helicopter?
Collective lever and cyclic stick
What is the main surface affecting the yaw control?
Rudder
why do blade need to be twisted?
Blade twist is introduced on the main rotor to avoid load variation from root to tip
Where to add the ballast if you want to move the CG of aircraft forward
Foward
What are the loads experienced on aircraft in flight? (5)
Bending Compression Tension Torsion Shear
What is the direction of a spar in wing?
In board to out board
What are the primary surfaces of an aircraft structure?
Longeron
Bulkhead
Frame
Spars
What are the types of fuselage construction?
Semi-monocoque and monocoque
What are disbonds?
An area within a bonded interface between two adherents in which an adhesion failure or separation has occurred. [loss of adhesive]
For consistent results to be obtain for aircraft weighing, how is it placed?
Placed in rigged position and clean aircraft
Main purpose of a hydraulic system?
Act as a force multiplier to actuate the control surface
What are the alternate methods to extend the landing gear? (4) (all of the above)
Pneumatic extension of LG
Mechanical crank or ratchet system
Mechanical release of Up Locks
Separate hydraulic system power
What type of structures are wing spars and longerons?
Primary structure
What does Titanium 6Al-4V means?
6% Aluminium
4% vanadium
Balanced Titanium
What is eddy current inspection?
Used for surface and near surface
Rough surface*
Non ferrous metal & ferrous metal
Contact of probe is necessary
What are the Primary FCS for Fixed-Wing A/C?
Pitch - Elevators / Canards
Roll - Ailerons / Flaps
Yaw – Rudder
What is the most common material used for f15 airframe?
50% aluminium 34% titanium 8% steel 2% composite 6% others
When does temporary repair need to be completed?
At the earliest opportunity
How is the Life preserver unit inflated?
Designed to keep the wearer afloat subsequent to immersion in water
Inflation by CO2 cylinder or oral inflation valve
What does cabin pressurisation involve?
Sealing the cabin
Supplying air to the cabin
Controlling cabin pressure by regulating the outflow of air
Ensuring the safety, efficiency and comfort of the aircrew
What are the heat loads that must be accounted for when designing the air-con system of aircraft? (do not need to account the heat load for engine)
- Ambient conditions outside aircraft
- Rate of heat release from equipment in the cabin
- Rate of heat release from the crew in cabin
- Heat input into aircraft structure resulting from kinetic heating
- NOT meant to supply cold air to cool the engine exhaust bay
In an anti G system, when does the valve open?
Automatic and dependent of the G load
What is not part of the pressure fuel system?
fuel quantity guage does it make up as a component? yes
will cabin regulator make up as a component? No
pressure relief valve? yes
what is the function of the flight control system?
gives input assistance for the pilot to overcome the enormous aerodynamic forces acting on the flight control surfaces.
What are the process that makes up the brayton cycle?
isobaric
isentropic
To produce optimum thrust, what is the blade angle?
3 to 4 deg
What is not the method to reduce blade vibration?
Putting engine side by side to cancel out the vibration
Frequency Control: Redesign to move the resonance frequency out of the engine’s operating range
Response Control: Introduce damping
Structural Control: Material change to improve vibratory capability
What is true about gas turbine engine inlet?
The purpose of the inlet is to deliver free-stream air to the face of the engine at conditions acceptable to the engine and with a minimum loss of the stagnation pressure available in the free stream.
Noise attenuation Radar attenuation (stealth) Nozzle secondary airflow Dust / Sand Particle Separation Airflow bypass to assist in engine starting
Which stroke when it reaches top dead when the valve is open?
End of Exhaust stroke
What is the purpose of shroud at the tip of the blade?
To minimise tip loss and provide a damper for vibrations
When can approval be sort through staff channel out of modification committee?
Flight critical
Safety related
Urgent due to operational requirements
What are the modifications that require mod leaflet?
Aircraft and Weapon System modification
Trial modification
Preferred part from OEM that requires aircraft modification and are introduced on a fleet-wide basis
LTO is approved by who?
Comd AELG / CO 80X / CO 81X / CO 50X
What is the definition of STI?
Special technical instruction for one time maintenance work (non recurring)
Same part number
