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MSA TEST Flashcards

1
Q

what are the 4 pre-installation requirement for bolt/screw

A
  1. bolt length should be chosen such that grip length is same thickness as materials joined
  2. nut must never be screwed down against the last thread on bolt

3.If there is no washer like bearing surface , washer placed under head

4.if grip length is too long, use plain washers to act as shims to prevent nut reaching last thread

  1. IF NOT SPECIFIED IN MANUAL, bolt should be installed with the head upwards,forwards or inboard to prevent bolt from falling out if nut not secured
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2
Q

What are the 2 basic visual aid tools required for visual inspection tasks?

A
  1. Flashlights: suitable for industrial use. Safety approved by underwriters laboratory or equivalent agency as suitable for use in hazardous atmosphers such as fuel tanks
  2. Inspection mirror: view an area not in normal line of sight, but must be free of dirt , cracks and worn coating. Swivel joint tight enough to maintain setting
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3
Q

What are 2 methods to determine air leaks?

A
  1. Sound: hearing for hissing sound
  2. Bubble test
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4
Q

Name 4 types of inspection on electrical connectors?

A
  1. Bent pins
  2. Misaligned pins
  3. Corroded contacts
  4. Loose connections
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5
Q

How to identify grip length of bolt and screw?

A

Grip length is the distance from underhead bearing surface to beginning of bevel just prior to threads

Screws with no countersink to screw or is a brass screw designed for electrical use or electrical heads: BODY OF SCREW

Countersunk screws: BEVELED PORTION OF THE HEAD OF THE SCREW

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6
Q

How to identify a self-locking nut and non-locking nut?

A
  • need no auxiliary means of safety but have a safety feature included as integral part of construction
  • Self locking nuts have nylok inserts known as Nylok. Nylok forms around the screw threads and prevents nut from loosening.

MS20365 low temp self locking nuts used on bolts or machine screws are prevented from vibrating loose by elastic start

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7
Q

What are the 4 pre-installation checks on o-rings?

A
  1. ensure that they are free from all contamination
  2. Removed from sealed package and inspected for defects such as blemishes,abrasions,cuts or punctures
  3. Look out for slight surface flaws by using magnifying glass if required with adequate lighting
  4. Roll the ring on inspection cone or dowel, inner diameter surface checked for small cracks, particles of foreign material that cause leakage or shorten life of o-ring
  5. slightly stretch o-ring when rolled inside out to reveal defects not visible
    5a. avoid using sharp edged or pointed tools that cause scratching or marring of hydraulic component surface
  6. immmerse the o-ring in clean hydraulic fluid
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8
Q

what is the function of a gasket with a function of its usage on an ACE equipment.

A
  • Gaskets are static seals between 2 flat surfaces. - -
  • Abestos sheeting is used whenever heat resistant gasket requred.
  • Copper washer used for spark plug gasket where it is essential to have a non-compressible soft gasket.
  • Cork gasket used for oil seal between engine crankcase and accessories and capable of occupying uneven or varying space caused by rough surface, expansion or contraction
  • rubber sheeting used for compressible gasket but cannot come in contact with gasoline or oil due to deterioration

use:
- AFL Inset FTO

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9
Q

Name 4 rules to follow when use a screwdriver correctly

A
  1. Use the right screwdriver for the right job or else damages screw
  2. Ensure that the blade or tip of screwdriver is a snug fit in screw slot or recess with no side play. Clean slot before engaging screwdriver
  3. Avoid using screwdriver with chisel point or substituting screwdriver for chisel
  4. Never strike handle of screwdriver with metal hammer
  5. Keep screwdriver upright when turning screw
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10
Q

What is the key selection criteria when choosing ratchet handle drive to break loose bolt?

A
  1. Breakaway torque: rotating force required to break fastener loose. Breakaway torque> original tightening torque as dynamic torque lower than static
  2. Determine amount of torque required for particular application

1/4- 28 ft-lbs
3/8- 80 ft-lbs
1/2- 285 ft-lbs
3/4- 710 ft-lbs
1- 1170 ft-lbs
1-1/2- 1920 ft lbs

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11
Q

What is the difference between continuity and resistance check?

A

Continuity: 2 points of circuit to see if there’s current flow
Resistance: check integrity of insulation/condition of cable/wire between 2 points

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12
Q

What is the main purpose of clamp meter?

A
  • measure current in a circuit without disconnecting it
  • jaws of clamp meter do not need to touch conductor during measurement
  • measure residual current
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13
Q

What is the difference between lockout and tagout?

A

Lockout: placement of secured lockout device on energy isolating device so that energy isolating device and equipment being controlled cannot be operated until lockout device removed

Tagout: placement of prominent warning tags on energy isolating devices to indicate energy isolating device and equipment being controlled cannot be operated until lockout device removed

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14
Q

What are 2 applications where lockout and tagout are used?

A
  1. Unexpected powering or start-up of machinery or equipment
  2. Release of hazardous energy during service or maintenance
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15
Q

What is the definition of Force,Pressure and Area?

What is the relationship with each other

A

Force: push or pull on an object

Area:
the total space taken up by a flat (2-D) surface or shape of an object

Pressure: force applied per unit area

Pressure=F/A

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16
Q

What is the medium used in transmission of force between pneumatic and hydraulic?

A

Pneumatic: Air
Hydraulic : Liquid

17
Q

What is Voltage,Resistance and current and their relationship with each other?

A

Voltage: measure of potential difference between 2 points
Resistance: Force that opposes the flow of current in a circuit
Current: movement or flow electrical charges

V=IR

18
Q

What is the main difference between open and short circuit?

A

Open : disconnection at any point in circuit
Short: electrical circuit in a device of lower resistance than that of normal circuit

19
Q

What type of AFL has frangible mounting? Why does it have frangible mounting?

A

Elevated runway edge and elevated taxiway edge lights. Fitting will shatter upon impact to prevent further damage to aircraft

20
Q

What is the main function of CCR?

A
  • produce constant current output independent of variations in circuit load and in voltage of power source

secondary function: 2 or more output currents when dimming of lights

21
Q

What are 2 key features of CCR?

A
  1. Has Protective relays to guard against over current and open circuit in external load circuitry
  2. powered from PUB mains at 2 phase 415V
22
Q

Why are AFL connected in series?

A
  • connected in a string with same current flowing in each element
  • If fixed input voltage connected to load, current in circuit would vary with connected load
  • However, CCR maintain constant current independent of load
  • Thus, same current flow in long circuit as in shorter circuit and remain the same even if some lamps fail
  • Short circuit across the output of a constant curent regulator is a no-load condition and open circuit is overload
23
Q

What are the PAPI light colours pilot would see when on correct approach slope?

A

2 red lights closer to runway, 2 white lights further away from runway

  • assist pilot to carry out correct approach during landing
  • installed beside runway with variation that include more panels
  • box of lights equipped with an optical apparatus that splits light output in 2 segments, red and white
  • glideslope angle set at nominal 3-degree glide slope to runway
  • 2 red closer to runway, 2 white further from runway
24
Q

What are the PAPI light colours pilot would see when deviated 20 minutes of arc?

A
  • assist pilot to carry out correct approach during landing
  • installed beside runway with variation that include more panels
  • box of lights equipped with an optical apparatus that splits light output in 2 segments, red and white
  • glideslope angle set at nominal 3-degree glide slope to runway
  • 2 red closer to runway, 2 white further from runway
25
Q

What are the PAPI light colours pilot would see when deviated 30 minutes of arc?

A
  • assist pilot to carry out correct approach during landing
  • installed beside runway with variation that include more panels
  • box of lights equipped with an optical apparatus that splits light output in 2 segments, red and white
  • glideslope angle set at nominal 3-degree glide slope to runway
  • 2 red closer to runway, 2 white further from runway
26
Q

What is the function of rubber support blocks of hookwire ?

A
  • store arresting gear hook cable beneath surface of runway
  • lifts hook cable into position (2-3 inches above runway surface) when arrestment anticipated
27
Q

What is the function of stanchion assembly?

A
  • Net alignment
  • to raise the net to appropriate height for aircraft engagemnt
  • net is hanging vertically in rounded “L” shape
28
Q

What is the function of EAU of MAG?

A

MK4- liquid turbulence converts kinetic energy to heat(9 rotor/radial 8 stator)

29
Q

What is repair criteria for purchase tapes?

A
  • cuts,abrasions ,wear,split,crease,scruffing,frayed edge
30
Q

What is the typical construction of pendant assembly?

A
  • few number of wires make up one strand of cable
  • wires preformed into helical or spiral shape
  • laid around a straight center strand to form a cable
  • eg: 7x7 cable(7 wires of 7 strand each)
  • eg 18x 7 non rotating right regular lay wire rope (Diameter 1 1/4 inch , length 200ft)
31
Q

What are daily safe work practices when performing maintenance on ACE equipment?

A

-SRA
- NDT
- CRM
- DAP
- PPE
- SDS
- Wearing of Jewellery during maintenance prohibited

32
Q

What are FOD prevention requirement in airfield maintenance?

A
  1. Active runway and taxiway checked for foreign objects and surface deterioraton
  2. Constant policing and sweeping of operational areas and ground run pads
  3. Cracks and expansion joints inspected for FOD
  4. Removal of debris carried out by manual means, when runway sweeper ineffective
  5. Adequate mechanical sweepers
  6. Competent sweeper operators
  7. Adhered to sweeping schedules of mechanical sweepers
  8. Monitoring of debris collected to identify origin of FOD, and locality of each type of debirs and corrective action taken
  9. Proper control of vehicles having access to operating areas
  10. Tight control of external agencies
  11. NOT setting good examples at all levels of management and supervision by personally observing FOD prevention regulations
  12. NOT personally attending FOD prevention committee meetings
  13. NOT accouncing FOD prevention activities at briefings,awards ceremony, roll call and training
  14. NOT conducting regular fod walks
33
Q

What are causes of FOD in airfield?

A
  1. Clothing
  2. Human factors
  3. Morale
  4. Not doing IAF
34
Q

What is the difference between Risk Assessment matrix and Task Safety analysis?

A

RAM= risk assessment of identified hazards prior to conduct of routine maintenance tasks using Management , man , medium and Machine
TSA= come up with preventive and corrective measures based on task itself

35
Q

What are safety principles of RSAF?

A
  1. Adopt zero accident mindset
  2. Zero accident is indicator of operational capability
  3. Incident reporting is mandatory for accident prevention
  4. Safety is individual,team and command responsibility

lk (3 decks)

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