10026 test 1 corrosion prevention

•exhaust trail areas •battery compartment / vents •lavatories •buffets •galley •bilge •internal fuel tanks •sea plane hulls and floats •animal transport •wheel wells, landing gear

1. electrical system 2. hydraulic system 3. control system 4. environmental control system 5. fire suppression 6. pressurization control system

a device for holding parts in position to maintain their shape. can be constructed to distribute loads while repairs are being accomplished

after the aircraft has been leveled

drill through center of weld #30, use putty knife to separate inner and outter frames.

deterioration of a metal because of its chemical reaction with the surrounding environment

1. anode (corrodes) 2. cathode (dissimilar metal) 3. electrolyte (liquid) 4. electrical contact

1. negligible damage 2. damage repairable by “patching” 3. damage repairable by “insertion” 4. damage necessitating “replacement” of parts

1. in spec 2. repairable 3. beyond economical repair 1. light 2. moderate 3. severe

• visual • LPI • optical micrometer • depth dial gauge • feeler gauge

TAP test

visual inspection

1. Liquid penetrant inspection, uses liquid to reveal damage 2. magnetic particle inspection, uses magnetism to reveal damage 3. eddy current uses electrical current to find damage

jacks “jacks plane up” for working on control surfaces, wing panels” lift slings “holds aircraft on sling” shoring “process of supporting a structure to prevent collapse”

“causes liquids to creep and crawl” reveals defects such as cracks & pits . interaction between contacting surface of a liquid and a solid

apply corrosion preventative compound

non-ferrous

only can be done by a NDT trained person

lockout, tagout, de-energize system

debris and liquids make their way to the lowest part of the plane

Fumes from overheated battery electrolyte are difficult to contain and will spread to

ferrous

true

air chisel

supporting a structure to prevent collapse

sodium bicarbonate; will neutralize acid deposits

bilge is a natural collection point for waste hydraulic fluids, water dirt, loose fasteners and other debris

gust lock

function is to house aircraft and aircraft components. used to remove or install engines or other components

supporting a structure to prevent collapse. used to support the aircraft structure when doing major parts removal

a strengthening wire to support a structure and is generally loaded in tension

a beam with four legs used to support something

gaining access to the corrosion areas “removing panels, jacking and cribbing, etc

•hand sanding •scotch bright •mechanical sanding, grinding and buffing

yes, but only if welds are difficult to break

high temp

roughing, etching or pitting accompanied by powdery deposits

white or grey powdery deposits, similar to dust

attack along the grain boundaries of material

below surface, lifting up or swelling

dissimilar metals making electrical contact in presence of electrolyte

special form of “oxygen” concentration cell. occurs when metal surfaces have an organic coating system

damage can occur when two highly loaded surfaces which are not designed to move against each other.

AMM / manufactures allowable damage limit chart

repair the part or replace it

yes