powerplant midterm recit 1

Question 1

some of the exhaust trail areas where deposits may be trapped
and not reached by normal cleaning methods.

Answer 1

gaps, seams, hinges, fairings

Question 2

The gases contain all of the constituents for a potent

electrolyte, and because of their elevated temperature, corrosion forms extremely rapidly

Answer 2

ENGINE EXHAUST AREA

Question 3

Gaps, seams, hinges, and fairings are some of the exhaust trail areas where deposits may be trapped
and not reached by normal cleaning methods.
Exhaust deposit buildup on the upper and lower wing, aft fuselage, and in the horizontal tail surfaces will
be considerably slower and sometimes completely absent from certain aircraft models.

Answer 3

engine exhaust area

Question 4

CORROSION AND LINT ACCUMULATION

ON CARGO DOOR MICRO-SWITC

Answer 4

ELECTRONIC EQUIPMENT

Question 5

CORRODED HARDWARE ON TERMINAL BOAR

Answer 5

ELECTRONIC EQUIPMENT

Question 6

The use of copper, lead, tin, and other metals in electronic
wiring and printed circuit boards makes them a target for
corrosion. Therefore, circuit boards are typically protected by
sealing the wiring and circuit boards with a transparent film
which excludes all oxygen and moisture from the surfac

Answer 6

ELECTRONIC EQUIPMENT

Question 7

May present a corrosion problem whether carbon steel or
stainless steel is used. The presence of bare spots in the
preservative coating is one of the main contributing factors in corrosion. Cable condition should be determined by
cleaning the cable assembly, inspection for corrosion, and
application of an approved preservative if no corrosion is
found

Answer 7

CONTROL CABLE

Question 8

These are prime spots for corrosion due to dissimilar
metal contact between the steel pin and aluminum hinge
tang

Answer 8

PIANO-TYPE HING

Question 9

On all aircraft, the bilge area is a common trouble area.
The bilge is a natural sump or collection point for waste
hydraulic fluids, water, dirt, loose fasteners, drill chips, and
other debris

Answer 9

BILGE AREAS

Question 10

INACCESSIBLE AREAS OR MISCELLANEOUS

AREA

Answer 10

• BILGE AREAS
• PIANO-TYPE HINGES
• CONTROL CABLES
• ELECTRONIC EQUIPME

Question 11

One of the first places corrosion appears on the surface of
an aircraft is along seams and lap joints.
It is here that concentration cell corrosion frequently
appears and, in clad skins, it is here that the sheared edges of
Alclad material are exposed without the protection of the
pure aluminium. There is also a danger of water or cleaning
solvents becoming entrapped in the lap joints and providing
an effective electroly

Answer 11

EXTERNAL SKIN AREA

Question 12

Probably no area of an airplane is subjected to as much hard
service as the wheel well area.
On takeoff and landing, debris from the runway surface is
thrown up into this area. This can be especially troublesome in the
winter when chemicals are used on runways for ice control.
Furthermore, abrasion can remove protective lubricants and
coatings, and water and mud can freeze and cause dama

Answer 12

WHEEL WELLS AND LANDING GEAR

Question 13

Organic materials such as food and human waste are

highly corrosive to aluminum surface

Answer 13

LAVATORIES AND FOOD SERVICE AREA

Question 14

-Despite improvements in protective paint finishes and
in methods of sealing and venting, they
continue to be corrosion prone area

Answer 14

Battery Compartments and

Battery Vent Opening

Question 15

-Constant abrasion by airborne dirt and dust, bits of
gravel from runways, and rain all tend to remove protective
surfaces.

Answer 15

ENGINE FRONTAL AREAS AND

COOLING AIR VENTS

Question 16

Areas

CORROSION PRONE

Answer 16

Engine Frontal Areas & Cooling Air Vents
 Battery Compartments & Vent Openings
 Lavatories and Food Service Areas
 Wheel Wells and Landing Gear
 External Skin Area
 Inaccessible Areas Or Miscellaneous Areas
 Engine Mount Structure
 Control Cables
 Welded Areas
 Electronic Equipment

Answer 17

-Constant abrasion by airborne dirt and dust, bits of
gravel from runways, and rain all tend to remove protective
surfaces from engine frontal areas and cooling air vents