7.18 - Disassembly, Inspection, Repair and Assembly Techniques

Question 1

What is the corrosive removal procedure for Magnesium?

Answer 1

Corrosive Removal - Magnesium
* Sulphuric acid
* Brush into area
* Clean with cold water
* Reproject with Alocrom 1200

Question 2

What is the corrosive removal procedure for Mercury?

Answer 2

Corrosive Removal - Mercury
* Vacuum
* Reproject
* X-Ray
* Whiskery is a sig
* n of mercury

Question 3

What is the corrosive removal procedure for Acid?

Answer 3

Corrosive Removal - Acid
* Bicarbonate
* Indicated by greyish powered, fuzzy deposits
* X-Ray required once clean

Question 4

What is the corrosive removal procedure for Alkali?

Answer 4

Corrosive Removal - Alkali
* Chromic acid

Question 5

Name 4 Anti-corrosion treatments

Answer 5

Anti-corrosion treatments
* Electroplating
* Sprayed metal coatings
* Cladding
* Surface conversion coatings

Question 6

Name the 3 structure types and their corresponding colours on drawings

Answer 6

Structure types
* Primary - Skin or frame. Shown in RED in drawings
* Secondary - Floorings. Shown in YELLOW in drawings
* Tertiary - Fairings. Shown in GREEN in drawings

Question 7

What are the 4 classifications of damage?

Answer 7

Damage is divided into 4 classifications
* Negligible damage
* Damage repairable by patching
* Damage repairable by insertion
* Damage needing renewal of parts

Question 8

What is classified by Negligible damage?

Answer 8

• Dents - May not exceed one gauge of the skin in depth and 0.75 ‘’ in diameter
• Nicks - Max depth is 1/8 ‘’ and less than 5’’ apart
• Scratches - No more than 0.010’’ deep

Question 9

Aging aircraft fatigue and corrosion control?

Answer 9

Aging aircraft fatigue and corrosion control
* 20-year-old planes

Question 10

What are the 3 levels of corrosion?

Answer 10

Corrosion
* Level 1 - Remove, no future action
* Level 2 - Remove, CPCP needs a review and adjustment at the operator level
* Level 3 - Remove, indicates a potential AMP failure and the operator may beed to check the entire fleet. CPCP must be reviewed by the manufacture. Must be reported to the authority

Note: CPCP = Corrosion Prevention and Control Programme

Question 11

What are the 3 fault finding methods?

Answer 11

1. Probability technique
2. Visual technique
3. Functional structure technique ‘‘Half split method’’

Question 12

How are Iron alloys inspected?

Answer 12

Iron alloys are inspected using magnetic particle inspection method

Question 13

3 points about Eddy current Testing

Answer 13

Eddy Current
* Little prep time
* Detect surface or near surface cracks
* Can determine heat treatment condition

Question 14

What NDT has the widest use and how does it work briefly?

Answer 14

• Ultrasonic has the widest use. High freq sound waves