Chap 12: Aircraft cleaning and protection Flashcards
what NOT to do when aircraft is covered in debris
do not:
use clean and dry cloth (may scratch paint away or the metal beneath, may also scratch away the corrosion resistance material on the metal surface)
practices of cleaning exterior of aircraft
wash away debris using water and mild soap, and rinsing with water again, then drying it with cloth or chamois (absorbent and non abrasive)
wax surface to certain lustre if needed
for stubborn stains (grease / oil): wipe clean with solvent moist cloth (solvent stated in manual)
what NOT to do when cleaning windshield/ plastic windows
do not:
clean debris off with dry cloth (may scratch surface of plastic)
practices of cleaning windshield/plastic windows
for plastic:
water is used to wash away debris
cloth moistened with mild soap solution to wash surface
wax plastic surface (to fill scratches and prevent new scratches)
for windshield:
for stubborn stains (grease / oil), wipe with cloth moistened with kerosene or methanol
what liquid to not use on plastic when cleaning and why
will attack the material and craze (crack) it:
1) gasoline
2) alcohol anti-icing fluid
3) lacquer thinner
4) glass cleaner
how should tires be cleaned
with soap and detergent and water OR with cleaner stated from manual
for stubborn stains, wipe clean with cloth moistened with petroleum
(affected stain area must be wiped clean and dry from petroleum immediately)
what liquid or solvent CANNOT be used for tire cleaning and why
causes deterioration of rubber:
petroleum
how to wash de-ice boots
clean with mild soap and water, wash thoroughly with water
to remove stubborn grime, use cleaner stated in manual (eg isopropyl) then wash thoroughly with water
what can be done to prolong the life of de-icing boots
should be serviced at regular interval and kept free from oil, grease or solvent that can cause rubber to deteriorate
how to clean interior of aircraft
use vacuum cleaner for seats, carpet, floorboard (remove dust, debris, sand) (must be done regularly to prevent dirt built-up)
for stubborn stains, wipe clean with cloth and household spot remover
for leather surfaces, clean with cloth moistened with soap suds, then wipe clean with damp cloth
how to do cockpit cleaning
instrument panels and control knobs are cleaned with damp cloth
(stubborn stains should be cleaned with cloth moistened with solvent stated in manual)
when do we wash the engines
carried out during scheduled servicing as stated in manual
how to clean engines
special wash rig used
1 part cleaning solution : 2/3 part water (cleaning sol. stated in manual)
3 methods to protect the aircraft
1) surface treatment
2) surface coating
3) treated tape
surface treatment processes and metals
protect surface from oxidisation Aluminium: - Alodising - Chromating - Anodising
Steel:
- Cadmium plating
- Chrome plating
- Phosphate plating
What is alodising and anodising
Alodising: bathing metal in hot alodise solution to give protective coating and surface for painting (used when electrical and thermal conductivity is important)
Anodising: acid treatment that forms non-conductive aluminium oxide layer on the part
(used when corrosion and wear resistance is important)
properties of anodising: higher corr. resist., better electrical insulation, hardened surface with better abrasion resistance, improved paint adhesion
what is plating and does it do?
electro-depositing layer of cadmium
higher corrosion resistance
purpose of surface coating
apply layers of coating to a part, corrosion prevention protection from environment functional fluid resistance resilient to flexing
types of surface coating
top coat/finishing coat: coating applied over an intermediate coating for appearance/ protection
electrically conductive / insulative coating: for radar and antennae enclosures
3 material used for coating
1) Lacquer
2) Enamel
3) Polyurethane
what are primers
primers: agents that provides good base for paint, used for corrosion protection
NOT used to fill up blemishes
wash primers: priming agent that has been diluted
increase adhesion of coating (not used as permanent protective coating)
e.g. phosphoric acid, zinc chromate
3 elements of paint
1) pigmentation: colour, durability
2) binder: holds pigment in liquid form together, able to stick to part surface
3) solvent: dissolves binder and carries pigment part surface
3a) when used with lacquer: called thinner
when used with enamel: called reducer
purpose and properties of treated tape
used to assist in preventing dents and delamination from FODs
individual/combination of high strength, impact/puncture/abrasion resistance
electrical and hear insulation
