M7C18

its presence in an aircraft does not mean a deficient corrosion control programme.

Primary structures are coloured red or shown white, Secondary are coloured yellow or shown hatched.

primary structure.

Type 1- Flourcent penetrant , type 2- colour – contact.

eddy current flow detection detect subsurface defects.

metals and non-metals.

penetrant dye and the application of developer.

to prevent crack propagation and fatigue failure.

turnbuckles are located at different locations on adjacent cable runs

Chapters 20 and 70.

coated with jointing compound, and the repair assembled and riveted while the jointing compound is wet.

In order of least expensive to most expensive to rectify

Follows a logical approach whether it is done with or without a formal troubleshooting chart.

most likely cause of the problem.

The first stage in the troubleshooting process is to gather as much information as possible.

Magnetic flow procedures. & Current flow procedures.

immediate test results

Alternating current.

negligible, repairable, no repairable.

drilling holes to stop a crack at the crack end.

In the middle third of the rod.

locate sub-surface discontinuities.

red lines on a white background.

Thoroughly degreased.

using a lint free cloth.

porous

Ultrasonic inspection

To create a good sonic coupling between the probe and the test piece

Surface flaws and those just beneath the surface.

Iron alloys.

Bicarbonate of soda.

to support the structure during repairs.

Uses chromates which covers the surface chemically.

greater than the highest stress likely to be encountered in service

subsurface defects.