Fire nation week 2 (2.0) part 1

There are 3 basic types of fuel tanks. They are:

Metal fuel tanks,

Intergral or Structural fuel tanks,

Rubber Bladder

Filler ports with caps Expansion space

(2%) for increase in the volume of fuel due to temperature expansion.

These fuel tanks also known as structural tanks because the structure itself forms the tank.

Integral Tanks

Where are Integral tanks located

in the wing of the aircraft,

What is referred to as Wet wing tanks

Integral Tanks

Bladder tanks are made from?

Neoprene

What does Blader tanks use for the structure

They use the structure around it to hold its shape and for support

Bladder tanks will attach to the structure by use of

Snaps, clips or lacing

All sharp surfaces and rivet lines must be covered with

anti-chafing tape or similar product as per AMM

Filler caps are located where?

top side of a fixed wing aircrafts's wing

Where is fuel caps located on a helicopter

mounted close to the C of G

Some filler caps are vented

The vent hole must be kept clear at all times.

If it is a goose neck

vent the tube

opening must face forward to provide a

positive pressure inside the tank

Filler caps must electrically

bonded to the airframe

The outside portion of the cap has

directions on how to properly close the cap

Lightning proof filler caps have no exposed metal parts inside to?

Prevent static discharge inside the tank

IF CAP COMES OFF IN FLIGHT THE FUEL WILL SIPHON OUT OF TANK BECAUSE?

OF LOW AIR PRESSURE ON TOP SURFACE OF WING

Aircraft fuel lines can be

Rigid or flexible

How can manufacturer's provide even further protection from abrasion and especially from fire

They wrap it

Rigid Fuel lines are often made from

5052 aluminium alloy AN or MS

Rigid fuel lines in the engine compartment, wheel wells, and other areas subject from debris, abrasion and heat what what material of fuel lines are used

Stainless steel

flareless fittings should be

finger tight then another 1/6 to 1/3 of a turn.

Has a synthetic rubber interior with a reinforcing fibre braid wrap covered by a synthetic exterior

Flexible fuel lines

Flexible hoses are used in areas where

vibration exists between components

Seperation should be maintained between all?

fuel hoses and electrical wiring

Never clamp wires to a

Fuel line

When separation is not possible

always route the fuel line below any wiring.

Why do we route fuel lines below wiring

so If a leak develops, it does not drip onto the wires.

Metal fuel lines and all aircraft fuel system components need to be

electrically bonded and grounded to the aircraft structure

All fuel lines should be supported so that there

No strain on the fitting

Clamp lines so that fittings are aligned and

Never draw two fittings together by threading

There must always be atleast one bend in rigid tubing between fittings to allow for slight movement due to

thermal expansion / contractions

Routing is desinged with

no sharp bends or rapid rises

Routing is designed with

no sharp bends or rapid rises

All fuel lines should be routed so they are safe from

Mechanical damage

used to shut off fuel flow or route the fuel to a desired location

Fuel valves

Light aircrafts may include how many valves

One valve, the selector valve

on light aircraft the _____ incorporates the shutoff and selection features into a single valve

Selector valve

Large aircrafts fuel system have numerous valves

valves are used for the following:

Shut-off valve to stop or shut off fuel flow (ON / OFF)

Selector valve for tank and engine selection

Cross feed valve for fuel feed from one engine to another

Maintenance of fuel system

There are 3 types of valves:

Manual

Motor Operated

Solenoid Operated

One of the simplest valves is the cone type valve also called the

plug valve

there is a brass cone that in the cone type valve that fits into a

conical recess in the valve body

Manual Cone Type Valve

is often used on small aircraft as a selector valve or a shut-off valve

One problem with the cone type valve is

they can become difficult to turn.

Selector valves are also commonly the

Poppet type

Manual poppet type valve is commonly used in place of a

cone type valve

Why is a manual poppet type valve used

because it gives a better feel when in the correct position

The use of electric motors to operate fuel system valves is common on

Large aircraft due to the remote location from the cockpit of fuel system components