Interview questions for tech

Interview Question's for Trainee Technician

✈Tell me something about yourself ?

☂It as the opportunity to leave a great impression on the interviewer. First of all you should seem confident and should wear a nice smile on your face. 

my name is XYZ. I have completed my course on AME from XYZ college delhi Then  I have completed my OJT from College/XYz airline after that I did my apprenticeship or job whatever you did. 

 ☂I have total X years of experience in Xyz airline or MRO.

☂My hobbies include (Your hobbies).

☂Mention your achievements followed by your hobbies. That’s all.

Points to remember:

⛑Do not provide details like your entire education history (except aviation education), family background etc which will only bore interviewer. Try to keep the answer much crisp.

⛑Smile and proper eye contact is the key and it shows your confidence. Most of the interviewer like it.

✈where have you worked recently and what have you learnt?

Ans.
☂Transit inspection, 
☂layover inspection, 
☂weekly inspection, 
☂IDG servicing, 

☂Hydraulic fluid servicing, 

☂Engine oil servicing, 

☂wheel change

☂Brake change 

☂N2 charging (accumulator)

☂ECO wash & 

few cabin task like

I have performed the cabin inspection,
where I  found anything defective then I replace or try to do it normal .
So I did the
☂N2 charging of door damper 
☂food tray table replacement
☂latch of tray table 
☂seat Spader fairing & plank fairing 
☂ arm rest & its cover 
☂flash light & its receptacle
☂overhead bin & its latch replace 
☂replacement of tubelight
☂Water filter 
☂ seat reclination 
lavatory task
☂replacement of Buffer & toilet horse shoe
☂replacement of camod cover    
☂replace the hand free faucet
☂basin water filter 
☂roller of paper roll
few cockpit task
☂Replacement of sunvissor 
☂pilot seat
☂replace the printer 
☂replacement of  captain foldable table 5/16 socket
☂arm rest & its cover.
You can tell whatever you did & you can segregated the task as per Boeing and airbus 

✈what is ATA X?

Ans: learn all ata codes as per this 
https://www.google.com/url?sa=t&source=web&rct=j&url=https://itlims-zsis.meil.pw.edu.pl/pomoce/ESL/2016/ATA_Chapters.pdf&ved=2ahUKEwiWuqfyosHoAhVllEsFHVLfDWIQFjAXegQIDBAB&usg=AOvVaw2fhDKcqf04Lev6db157JgT
Try to learn major ATA Like 21to 35, 48,49, 71-80 
Note please segregated ATA as per your stream.

✈where can you find the part no. of any component? 
Ans;-IPC (ILLUSTRATED 

PARTS CATAOGUE) 
Note- you need to cross check the part no. Before replace it.

✈Units and definitions of X

☂pressure (psi),:-Pressure is defined as the physical force exerted on an object. The force applied is perpendicular to the surface of objects per unit area. 

☂specific gravity (unitless) -Specific gravity is a ratio of the density of some material (usually a liquid) compared to the density of water. The SG of Jet A (or gasoline) would be less than 1.0, since these fuels are lighter than water. Density is a little more relevant for the pilot in routine flight operations.

☂mass (kg)-measure of its resistance to acceleration when a net force is applied.

☂momentum (kgms-1)-the ability to keep increasing or developing; the force that makes something move faster and faster

✈Modules of turbofan engines? 

Ans:

☂ Fan Module 

☂Intercase Module 

☂High Pressure Compressor 

☂Diffuser/Combustor Module 

☂High Pressure Turbine 

☂Low Pressure Turbine 

☂Accessory Drive Gearbox 

✈Engine starting procedure from APU pneumatic air?

Ans. - Bleed air will come to starter valve. Starter will convert pneumatic energy into rotational energy. 

This energy will go to accessory gearbox where horizontal shaft 

will rotate the vertical shaft by bevel gear. 
It will rotate the HPC. 
HPC rotates HPT

and due to aerodynamic coupling. LPC and LPT starts to rotate. At self sustaining rpm the stater will disengage and the engine will rotate to idle rpm.

Note you can see more here...
https://youtu.be/992OkwMNOCA

✈Classification and types of tools ex: - screw driver, mallet, hammer etc.?

Ans: 
☂Screw driver are classified by shape of blade, length of blade and type of blade.

☂Hammers are classified as Hard hammer and Soft hammer.

☂Hard hammers are classified by weight of the head without handle.

☂Soft hammers are classified by diameter of the face.

✈Types and unit of torque wrench, formula with extension and drive of torque wrench?

Ans:
 ☂Type of torque wrench 1. Flexible beam 2. Rigid frame type 3.ratchet type.

☂Basic formula: F x L=T

With extension=Tw=Te x A/A + extension (B) 

Tw is A Lever length of wrench

B - Lever length of wrench plus extension (A + extension)

Te - Required torque on bolt

Tw - Torque reading on wrench dial

✈What is dry torque, running torque, break down torque?

Ans: 

☂Dry torque is applied without using any lubricant. Only example is Oxygen system to prevent contamination of O2 and to prevent fire hazard also

☂Wet torque is applied with using any lubricant.
☂Breakaway torque is defined as how much torque is required to start a part’s rotation from a stationary position. 
☂Running torque is the determination of how much torque is required to keep the part rotating at a constant angular velocity once it starts rotating.

✈Advantage of fly by wire?
Ans. 
☂ Pilot workload reduction
☂The fly-by-wire system provides a more usable interface and
takes over some computations that previously would have to be
carried out by the pilots.
☂ Airframe safety
☂ By mediating the control commands, the system can ensure that the pilot cannot put the aircraft into a state that stresses the
airframe or stalls the aircraft.
☂ Weight reduction
☂By reducing the mechanical linkages, a significant amount of
weight (and hence fuel) is saved.

Note click here to know more about fly by wire system 
https://youtu.be/2vQ5XHsw628

✈difference b/w internal and external combustion Engines?
Ans:
☂ external Combustion engine is steam engine and 
☂the rest are internal combustion Engine

✈Diffrent sections of Airman or name all manuals?
Ans:
☂ AMM Aircraft Maintenance Manual
☂ TSM Trouble Shooting Manual
☂ AIPC Aircraft Illustrated Parts Catalogue
☂ASM Aircraft Schematic Manual
☂AWM Aircraft Wiring Manual 
☂AWL Aircraft Wiring List
☂ESPM Electro Static Parts Manual

✈Precautions during refueling specially chock positions?
Ans:- some gap should be there b/w wheels and chocks.
when weight of fuel will put some load on wheel so we make sure that chocks are not stuck 

✈what is one thou?
Ans:- its thousands of an inch i.e 0.001”
Ans; 1/5 of 1 thou
1/5=0.20 1 thou= 0.001 or 1/1000
Put 3 zeros after the decimal i.e 0.0002 is ans.

✈what is EASA? 
Ans. EUROPEAN AVIATION SAFETY AGENCY.

✈what will u check while taking seals from store?
Ans:-serviceable tag,envelope sealed,correct part no.,shelf life.

✈Different types of hydraulic systems of A320 and which one have electric 
pumps, and on ground how will you energize the green system from yellow?
Ans: We have 3 systems Green, Yellow and Blue.
☂Green is pressurized by 2 ways 
1. ENG 1 EDP (engine driven pump)
2. PTU (power transfer unit)
☂Yellow is pressurized by 4 ways
1. ENG2 EDP
2. PTU
3. Hand Pump
4. 4. Electric Pump

Note check here for more about A320 hydraulic system
https://youtu.be/lMJar6ou9uc
☂Blue is pressurized by 2 ways
1. Electric Pump
2. RAT.

☂HYDRAULIC POWER for Boeing
The three hydraulic systems operate independently at 3000 psi nominal pressure. The three systems are system A, system B, and 
the standby system. Each system has a reservoir, pumps, and filters. 
The hydraulic fluid is fire resistant 
☂SYSTEM A 
System A uses one engine-driven pump (EDP) and one electric motor driven pump (EMDP). The system supplies hydraulic power to 
these systems: 
• Flight controls 
• Landing gear 
• Nose gear steering 
• Alternate brakes 
• Flight and ground spoilers 
• Left thrust reverser 
• Tail skid 
• Power transfer unit (PTU). 

Note check here for more about B737-800 hydraulic system
Note check here for more about A320 hydraulic system

☂SYSTEM B 
System B uses one EDP and one EMDP. System B supplies hydraulic power to these systems: 
• Flight controls 
• Normal brakes 
• Trailing edge flaps 
• Leading edge flaps and slats 
• Right thrust reverser 
• Flight spoilers 
• Alternate nose gear steering 
• Alternate gear retraction. 
Regulated air from the environmental control system pressurizes system A and system B reservoirs. The air gives a positive supply 
of hydraulic fluid to each pump. The standby system reservoir gets pressure from fluid in the system B reservoir. 

☂STANDBY SYSTEM 
The standby system, which has a separate electric motor-driven pump, is an auxiliary source of hydraulic power. To operate the standby 
system, move either of the FLT CONTROL switches to STBY RUD or the ALTERNATE FLAPS switch to ARM. The switches are on the 
overhead panel. The standby system also operates automatically. 
Standby hydraulic power supplies pressure to these systems: 
• Rudder control system 
• Either or both thrust reversers 
• Leading edge flaps and slats (full extend only) in the alternate flap mode. 
For normal operation, system A and system B are on and the standby system is off.

✈Re- fueling precautions*
☂AME supervising the Re-fuelling must ensure the following in addition to the precautions &procedure
1) The Refuelling vehicle entry & Exit Path is clear & unobstructed.
2) All the Hoses and Cables are properly secured at correct location before the Refuelling
starts.
3) Double check the Fuel on-board required before instructing the Refuelling Personnel to
stop Refuelling.
4) After completion of the Refuelling, ensure all hoses and cable have been disconnected
from the Aircraft and properly secured onto the Refuelling equipment/ Vehicle.
5) Fuel cap is secured positively to the fuelling receptacle.
6) Sign off the Fuel Receipt AV-7 Form for refuelling completion.
NOTE : this receipt to be signed only when all the Refuelling hoses and cables have
been removed and secured onto the Refuelling vehicle.

✈Why do we measure fuel quantity in KGS not in LTRS?

Ans: Because KGS is weight i.e. pull of gravity which is not affected by temperature. 
Whereas LTRS is volume which varies with temperature change.
https://youtu.be/9GY11rXnamQ

✈Definitions of following laws: -
☂Boyles’ law states pressure is inversely proportional to volume at constant temp.
☂Charles’ law states that volume is directly proportional to temperature at constant 
pressure
☂Pascal’s law: states that force applied on incompressible fluid will be transferred in 
any direction without loss of energy,
☂Hooke’s law: is law of proportionality between stress and strain,
☂Newton’s laws:
1.body in rest tends to remain in rast or body in motion tends to remain in motion 
unless external force in not applied
2.unbalance force applied on body gives acceleration in direction of force, than that 
acceleration is directly proportional to force and indirectly proportional to mass
3. every action has equal and opposite reaction,
☂Bernoulli’s principle: fluid passed through a ventury velocity increases and temp and 
pressure decreases and total energy remains constant.

✈Angle of Attack, aspect ratio, Angle of Incidence?
☂AOA: angle between relative wind and cord

☂Aspect ratio: span by cord ratio
Angle of incidence: angle between cord and longitudinal axis.
Note - Go through this for AR
https://youtu.be/rq_AWWjcYyQ ✈What is ram air turbine (RAT) and its functions?
Ans: 
☂ RAT or Ram Air Turbine is a small unit having to small aerofoil shaped blade installed in it. 
When it is deployed to the incoming airstream, the blades rotate at high speed providing emergency drive for the blue hydraulic system 
pressure pump.
☂ blue hydraulic system is 
pressurized and supply minimum amount of system pressure for the most basic systems. 
Also, the blue hydraulic pressure rotate the motor part of the CSM/G. The motor shaft is in turn connected to the AC generator part of the 
CSM/G and thus provide the aircraft ☂*the emergency electrical supply of *115 V 400 Hz AC supply* of *5 kVA rating*
 rat supply
*115 V  400 Hz AC supply
*5 kVA
Note- You can feel it when you go through this 
https://youtu.be/c9yz6Gd216o
☂RAT is automatically deployed*
 if it senses
a. Both hydraulic system EDPs failed and loss of 
pressure
b. Failure of both AC bus 1 and 2.
c. Aircraft speed is above 100 knots.

✈How do you open nose & main landing gear door on ground?
Ans: By pulling the handle behind it. It will be opened by gravity.
For closing switch on yellow hyd. Elec pomp it will then pressurize green system via PTU. Lift the handle insert the locking pin and check the indication on ECAM page. 
(same for MLG door)
You can Leart by this video 
https://youtu.be/YTLcFK9lAA8

✈What are the different source of power for a/c? 
Ans:- *aircraft power source
☂The IDGs installed on each engine and 
☂the APU generator supply *115V 400 Hz 3 phase AC*
supply of 90 kVA.
☂The emergency generator i.e. 
CSM/G supply *115 V 400 Hz 3 phase* AC supply 
of  *5 kVA* output* .
☂ The two *batteries of aircraft*
are of 23 Ah rating and supplies 24V DC supply to the DC buses.
☂The ground electrical supply connected to the aircraft should supply 115 V 400 Hz 3 phase AC 
supply of 90 kVA power rating.BATT 1&2(24V,23AH)

✈convert ¼ of a thou to inches?
Ans ¼= 0.00025”

✈ O-ring discarding procedure? 
Ans :- 
☂Cut the O- ring and through it in dust bin.
☂Replaced with new one.

✈you can go through this if you want know more about A320
www.smartcockpit.com › A320_Fli...

✈wheel changing procedure?
Ans:for Airbus
☂In cockpit pull the related brake fan cb, 
☂put the park brake on, 
☂install the placard not to operate L/G systems and flap
☂take the L/G pins and come down to install them. 
☂Check the jack should be serviceable and it take oproper load or not. 
☂Check the new wheel tyre pressure and circlip.
☂Whether should be clear and nothing should be under or near wing surface.
☂Remove the choke from the wheel to be removed and place it ahead of the other 
wheel. 
☂Start jacking. (Note- make sure the gap between pax door and Aerobrige or ladder)
☂Depressurize the wheel. Up to 50psi
☂Remove the debris guard by 7/16. 
☂Remove the brake fan by 13/16. 
☂Remove the wheel cap. 
☂Remove the clamp by 3/8. 
☂Remove the cross bolts by 7/16. 
☂Remove the axle nut. 
☂Remove dust protector (in 737)
☂Install the thread protector and remove the wheel. 
☂Check the condition of axle and brake and then apply a thin film of grease on axle and 
☂install the new wheel (Aeroshell 22 white color). 
☂Now same as above in reverse. 
☂Torque the main wheel 
      ⛑initial 220 ft lbs and
      ⛑ final 110 ft lbs. 
after complete installation 
do a check for brake fan.
You can go through this video.
https://youtu.be/Ac5ho3YdqvU ✈Tyre pressure check
☂check tyre pressure when *tyre are not hot*.
☂Service with only *nitrogen*.
☂A320 Neo /Ceo
    NLG=178-187 psi
    MLG=209-219psi
☂A321 Neo
    NLG= 168-177 psi 
    MLG= 228-239psi

☂B737-800
    NLG= 205
    MLG =95
Note - we charge the tire as per AMM & make sure cross check the TPG error card.

✈basic air conditioning system and components order wise ?*
Ans:-

☂ Pre conditioned air enters the primary heat exchanger where it is cooled by ram air. 
☂Then it goes to compressor where the pressure and Temperature increase then it goes main 
heat exchanger for cooling by ram air then it goes to turbine where the energy is extracted to rotate the compressor and due to expansions air cools. 
☂Then in goes to water 
separator and then to the mixture and distribution unit.
 ☂There are 2 PACKS (pneumatic air conditioning kit). Air cond controlled by 2 computer . 
 ⛑ACSC1 AND ACSC2 (airconditioning system controller). And 
 ⛑pressure is controlled by CPC1 AND CPC2 (cabin press. controller). 
 ⛑1 outflow valve and 
 ⛑2 safety valves.

✈Tell me about IDG & its functions?
☂IDG or Integrated Drive Generator is an  AC generator integrated with a Constant Speed Drive(CSD). ☂The CSD is driven by the Accessory Gear Box(AGB) which is in turn driven by the engine. Since engine speed varies with operation, ☂the input to the CSD also varies.But, irrespective of variation in CSD input rpm, 

☂the output of the CSD remains always constant which is delivered to the generator. Thus the generator is rotated at a constant rpm and thus produces constant frequency of 400 Hz of the AC it produces.

☂The IDG has its *own oil supply* and hence is independent of engine oil system. 

☂It is a Line Replaceable Unit.

✈Why NITROGEN is used in tyres ?
Ans:
☂higher operating temp. ,

☂inert gas,
☂prevents fire hazard and corrosion.
✈Basic aerodynamics?
Ans. 
☂AERODYNAMICS:
The study of airflow and its principles. Applied aerodynamics is the science of improving man-made objects in light of those principles.

☂AIRFOIL:
The design of an airplane's wing when seen from the end, a shape intended to maximize the aircraft's response to airflow.

☂ANGLE OF ATTACK:
The orientation of the airfoil with regard to the airflow, or the angle that the chord line forms with the direction of the air stream.

☂CAMBER:
The enhanced curvature on the upper surface of an airfoil.

☂CHORD LINE:
The distance, along an imaginary straight line, from the stagnation point of an airfoil to the rear, or trailing edge.

☂DRAG:
The force that opposes the forward motion of an object in airflow.

☂LAMINAR:
A term describing a streamlined flow, in which all particles move at the same speed and in the same direction. Its opposite is turbulent flow.

☂LIFT:
An aerodynamic force perpendicular to the direction of the wind. For an aircraft, lift is the force that raises it off the ground and keeps it aloft.

☂PITCH:
The tendency of an aircraft in flight to rotate forward or backward; see also yaw and roll.

☂ROLL:
The tendency of an aircraft in flight to rotate vertically on the axis of its fuselage; see also pitch and yaw.

☂STAGNATION POINT:
The spot where airflow hits the leading edge of an airfoil.

☂SUPERSONIC:
Faster than Mach 1, or the speed of sound—660 MPH (1,622km/h). Speeds above Mach 5 are referred to as hypersonic.

☂TURBULENT:
A term describing a highly irregular form of flow, in which a fluid is subject to continual changes in speed and direction. Its opposite is laminar flow.

☂VISCOSITY:
The internal friction in a fluid that makes it resistant to flow.

☂YAW:
The tendency of an aircraft in flight to rotate on a horizontal plane; see also Pitch and Roll


http://www.scienceclarified.com/everyday/Real-Life-Chemistry-Vol-3-Physics-Vol-1/Aerodynamics-Key-terms.html#ixzz6I9gYYYEv

✈xyz recent activity ,fleet and future plans esp. related to international 
operation.(interviewer airline )
Ans:
☂currently xyz✈total fleet is X
☂the latest aircraft Registration is Vt-ixy  ☂☂the latest domestic base started is Chandigarh IXC and
☂latest international base started is Dubai. ☂first flight was from delhi to bombay on 4 august 2006

✈What is the angle of Philips screw driver?
Ans
☂Phillips is 53° and
☂Reed and Prince is 73°

✈FLAPS operation and principle.
Ans: flaps and slats are high lift devices. In A320 2 flaps and 5 slats on each wing.
Fowler flap. Slats and fowler flap increase the camber and the slot prevents boundary layer separation.
Note - Boeing use double sloted fowler flap

✈Explain RVSM. (Reduced Vertical Separation Minima)
Ans: it is the vertical distance bw 2 a/c. normally it is 2000 ft as per CAR for non
RVSM but if RVSM certified than it gets reduced to 1000 ft.

✈TAXING PROCEDURE IS GIVEN WHERE? ANS: ATA 9

✈A *MEL* is a document, which allows the operation of a specific aircraft under specified conditions, with particular item(s) of equipment inoperative at the time of dispatch for the intended flight. An approved MEL consists of an approved list of the specific inoperative equipment.
☂cat-A ; As soon as possible
☂cat-B; 3 days

☂cat-C; 10 days
☂cat-D; 120 days

MMEL
☂It is a list of items of equipment that may be temporarily inoperative under certain conditions and limitations,
while still maintaining the level of safety intended in the design standards. Normally the
☂*MMEL* is developed by
the aircraft manufacturer in conjunction with operators and is approved/accepted by DGCA

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