Transparencies

Question 1

What are the 10 parts of an Engis X50?

Answer 1

Eyepiece
Viewing lens
Internal rotating scale
Lens barrel
Cursor
Depth scale
Focus ring
Lower lens
Transparent base
Feet

Question 2

3 most common materials used in transparencies

Answer 2

Glass
Acrylic
Polycarbonate

Question 3

Whats the benefit of polycarbonate in comparison with acrylic for transparencies?

Answer 3

Tougher and stronger, can withstand higher temperatures

Question 4

Pre use check of an Engis X50

Answer 4

Ensure no damage
Ensure lenses are secured in
Fit rubber eyepiece

Question 5

How is glass prepared for aircraft transparencies?

Answer 5

Annealed then thermally or chemically processed to increase strength

Question 6

Two different types of chip on aircraft transparencies?

Answer 6

Surface chip
Edge chip

Question 7

Two different types of surface chip on aircraft transparencies and allowable dimensions?

Answer 7

Negligible chip - less than 1mm diameter

Minor surface chip - less than 1mm depth, no more than 3mm width, not exceeding 25mm squared

Question 8

What to do if Engis X50 reading is suspect?

Answer 8

Check against a known depth and replace if inaccurate

Question 9

Whats the magnification of the Engis X50?

Answer 9

X50

Question 10

What the field of view of Engis X50?

Answer 10

2.0mm

Question 11

Whats the graduations on focus ring on Engis X50?

Answer 11

0.1mm (0.004 in)

Question 12

What are the graduations on lens scale on Engis X50?

Answer 12

0.02mm (0.0008 in)

Question 13

Whats the max measuring range on Engis X50?

Answer 13

1.6mm

Question 14

Whats the size of Engis X50?

Answer 14

Dia - 41.5mm X Height - 122mm

Question 15

Whats the weight of Engis X50?

Answer 15

83gm

Question 16

3 categories of aircraft transparencies?

Answer 16

Forward windscreen and centre panels

Side panels or quarter lights

Cabin windows and ancillary transparent panels

Question 17

3 classifications of areas of vision according to their optical effect?

Answer 17

Supercritical
Critical
Non-critical

Question 18

Aircraft designers select transparency materials based on:

Answer 18

Physical and mechanical properties

Ambient operating conditions

Optical quality

Application
- Pressurised cabins
- Non-pressurised cabins
- All weather capabilities

Question 19

What is one full rotation of the focus ring in an Engis X50?

Answer 19

8.0mm

Question 20

What do you use to measure the depth of crazing in a transparency?

Answer 20

Millimetre graph paper
A X10 magnifying glass
Suitable light source

Question 21

How to measure depth of indentation with an Engis X50?

Answer 21

Draw chinagraph line on clean area adjacent

Adjust focus ring until line is in focus, take measurement

Without adjusting focus ring, move over the indentation

Readjust focus until bottom of indentation is clear, take measurement

Subtract first reading from second, result is depth in mm

Question 22

How to assess distortion?

Answer 22

A grid board positioned in front of transparency. Any distortion can be observed from behind transparency identified by a distorted line on the grid board.

Question 23

How to identify delamination in transparencies?

Answer 23

Moisture ingress shows as cloudy areas

Delamination around edges can show as smooth edge or rough edge

Doubtful cases, shine a light through between two lines, if delaminated, an additional line will show.

Question 24

Whats controlled delamination?

Answer 24

Where release tapes are built into edges of panels to permit flexing in service

Question 25

How do you clean transparencies?

Answer 25

Coarse dirt washed off with water Do not rub Remove grease by swabbing with photographic grade wool saturated with aircraft transparency cleaner Allow to air dry or swab dry Wipe glass surfaces with chamois leather

Question 26

Outline transparencies Polishing prcedures

Answer 26

Reference AMM - Ensure all dirt cleaned - light hand pressure - renew polish cloth frequently - avoid accumulating polishing materials in recesses or frame abutments

Question 27

What to do with a superficial scratch?

Answer 27

Glass - Acceptable subject to aircrew approval Plastic - remove with reference to ADS

Question 28

What to do with a moderate scratch?

Answer 28

Glass - acceptable subject to aircrew approval Plastic - removed, consult ADS

Question 29

What to do with deep scratches?

Answer 29

Glass - Can cause cracks, should be replaced Plastic- consult ADS to establish maximum permissible damage then remove using approved procedures if applicable

Question 30

How should transparencies be stored?

Answer 30

Cool, dry, well ventilated environment. Keep away from vapours and abrasives

Question 31

6 types of damage to transparencies

Answer 31

Physical damage Crazing Delamination Cracks Bubbling Discolouration

Question 32

Whats ADS?

Answer 32

Aircraft Document Set

Question 33

Two types of sealant?

Answer 33

Polysulphide Silicones

Question 34

What temperature range do polysulphide sealants work at?

Answer 34

-55 to +120 degrees centigrade

Question 35

What are polysulphide sealants resistant to?

Answer 35

UV Light Fuels Oils Hydraulic fluid

Question 36

What does RTV stand for? What are they for?

Answer 36

Room temperature vulcanising (sealants) Used in high heat areas and electrical components

Question 37

Whats curing and non curing sealants?

Answer 37

Curing form a tough rubbery solid resistant to weather, moisture and ozone. Non curing are used for integrated fuel tanks as they swell on contact with fuel producing a tighter seal.

Question 38

Name the 3 procedures which may be carried out to repair transparent plastic panels

Answer 38

Repair scratch or score Apply external patch Apply insertion patch

Question 39

Whats perspex, oro glass and plexiglass another name for?

Answer 39

Acrylic

Question 40

What material can be treated by stretching to impart superior crack/craze resistance? (Transparencies)

Answer 40

Acrylic

Question 41

What material can only be used to clean an acrylic transparency?

Answer 41

Micro mesh