AFS Topic 2 DIFF

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Questions and Answers

What is the primary purpose of a fuel pump in an aircraft fuel system?

To regulate fuel temperature

To provide high-pressure fuel for engine operation

To provide flow for the aircraft fuel (correct)

To monitor fuel pressure

How are electrically driven pumps typically driven?

Mechanically by the engine

Pneumatically by compressed air

Hydraulically by the fuel system

Electronically by the aircraft's electrical system (correct)

What type of pump is used as a fuel boost pump?

Vane pump

Both a and d (correct)

Gear pump

Centrifugal pump

What is a key difference between electrically driven pumps and engine driven pumps?

The driving method Signup and view all the answers

Why is it important that the volume of fuel pumped by the EDP is less than the volume of fuel pumped by the boost pump?

To prevent cavitation of the boost pump Signup and view all the answers

Where is the fuel boost pump typically located?

At the bottom of the fuel tank in the surge or collector box Signup and view all the answers

What is the primary function of the fuel boost pump?

To provide low-pressure fuel for engine start and priming the engine pump Signup and view all the answers

What is the advantage of submerging the fuel boost pump in the fuel?

It eliminates the need for priming before pump operation Signup and view all the answers

What is the primary function of the detent plate in a cone type valve?

To indicate the fully open position Signup and view all the answers

What is the main difference between the two types of motor operated valves?

One uses a motor-driven sliding gate and the other uses a drum Signup and view all the answers

What is the purpose of the spring-loaded pin in a cone type valve?

To align the cone with the valve body Signup and view all the answers

What is the function of the cam in a poppet type fuel selector valve?

To rotate the poppet valve Signup and view all the answers

What type of valve is most commonly used on small aircraft?

Poppet type fuel selector valve Signup and view all the answers

What is the purpose of the cone in a cone type valve?

To allow fuel flow from the inlet to the outlet Signup and view all the answers

What is the function of the shaft in a cone type valve?

To rotate the cone Signup and view all the answers

What is the primary material used to make the cone in a cone type valve?

Brass Signup and view all the answers

What is a major disadvantage of jettisonable tanks in aviation?

They can restrict an aircraft's performance due to increased drag. Signup and view all the answers

Why are integral fuel tanks often used in aircraft design?

They use the maximum amount of space for the fuel for the minimum amount of weight. Signup and view all the answers

What is typically used to seal the rivets and nut plates in an integral fuel tank?

Fuel resistant sealant Signup and view all the answers

What is the purpose of a low fuel pressure warning light?

To draw the pilot's attention to low fuel pressure Signup and view all the answers

What is indicated by valve-in-transit lights?

When the valve is fully open or fully closed Signup and view all the answers

Where are access panels, hand holes, and tank connections typically located in an integral fuel tank?

At strategic positions in the structure Signup and view all the answers

What is the purpose of a fuel pressure gauge?

To draw the pilot's attention to certain conditions Signup and view all the answers

What is the purpose of sealing the inspection openings in an integral fuel tank?

To prevent fuel leakage Signup and view all the answers

On which part of the aircraft can valve-in-transit indicators be found?

On the fuel panel in the cockpit Signup and view all the answers

What is the advantage of using integral fuel tanks in terms of space?

They use the maximum amount of space for the fuel Signup and view all the answers

Why are rigid tanks not commonly used in aircraft design?

They require a large open space in the aircraft structure Signup and view all the answers

What type of display system depicts valve positions graphically on screen?

Digital display system Signup and view all the answers

What is the purpose of sealing the seams in an integral fuel tank?

To prevent fuel leakage Signup and view all the answers

What is used to move fuel to desired locations in an aircraft with multiple fuel tanks?

Valves and pumps Signup and view all the answers

What is used to show the valve position as OPEN or CLOSED?

Annunciator lights Signup and view all the answers

What type of indicator is used to show the valve position in some aircraft?

Magnetic indicator Signup and view all the answers

What is the first step the tradesperson must take before removing the aeronautical product?

Check the Aircraft Maintenance Documentation (AMD) to determine if there are any entries in the ‘Details of Unserviceabilities’ column Signup and view all the answers

What is the purpose of checking the Aircraft Maintenance Documentation (AMD) before removing the aeronautical product?

To check if there are any entries in the ‘Details of Unserviceabilities’ column that prevent the fuel system from being worked on Signup and view all the answers

What is the purpose of identifying the correct aircraft technical publication covering fuel system maintenance procedures?

To identify the correct procedures for fuel system maintenance Signup and view all the answers

What is the purpose of recording details of applicable restrictions in the AMD?

To inform others of the restrictions that apply to the maintenance task Signup and view all the answers

What is the purpose of ensuring that Composite Tool Kit (CTK) use on the aircraft is accounted for?

To ensure that the correct tools are used for the task Signup and view all the answers

What is the purpose of consulting with the Trade Supervisor/Maintenance Manager (MM) regarding Quality Inspection requirements?

To ensure that the quality of the maintenance task is acceptable Signup and view all the answers

What is the purpose of ensuring that the aircraft is safe to perform maintenance on?

To prevent injury or damage to the aircraft or personnel Signup and view all the answers

What is the warning associated with aviation fuel in liquid and vapour form?

It poses a significant health and explosion risk Signup and view all the answers

Study Notes

Jettisonable Tank Disadvantages

Lack of protection in crash or enemy fire
Restrict aircraft performance due to bulkiness and increased drag

Integral Fuel Tanks

Use maximum space for fuel with minimum weight
Sealed off portion of wing to form a fuel tank
Fuel resistant sealant used to seal rivets, nut plates, and inspection openings
Suitable access panels, hand holes, and tank connections included in structure

Fuel System Components

Fuel pumps provide flow for aircraft fuel
Pumps can be electrically or engine driven
Electrical driven pumps:
Provide low-pressure fuel for engine start and priming
Constant speed pumps that deliver continuous fuel supply
Located at bottom of fuel tank in surge or collector box
Eliminate priming before pump operation
Engine driven pumps:
Flow of fuel variable, dependent on engine speed
Volume of fuel pumped must be less than boost pump to prevent cavitation

Valves

Cone type valves:
Simplest type of valve
Cone made of brass fits into conical recess in valve body
Drilled to allow flow from inlet to selected outlet
Detent plate and spring-loaded pin used to indicate fully open position
Poppet type selector valves:
Used on small aircraft
Turning handle rotates cam, raising poppet valve to allow fuel flow
Motor operated valves:
Two types: motor-driven drum with holes, and motor-driven sliding gate
Pressure warning signals:
Visual and audible warnings for low fuel pressure
Illuminated warning lights used in conjunction with gauge indications

Valve-In-Transit Indicator Lights

Used to indicate valve opening or closing
Valve-in-transit lights show when valve is opening or closing
Annunciator lights show valve position as OPEN or CLOSED
Some aircraft use graphical depiction on screen or magnetic indicators

Fuel Control Panel Layout

Example shown is a two-engine business aircraft fuel control panel

Preparation for Removal

Compliance with Aircraft Maintenance Documentation (AMD) required
Entries in AMD include:
Details of unserviceabilities
Aeronautical product removal
Aircraft technical publication covering fuel system maintenance
Tank entry procedures
Restrictions and hazards identified
Tool kits and Ground Support Equipment (GSE) selection
Consultation with Trade Supervisor/Maintenance Manager
Quality Inspection requirements
Safety checks and atmosphere monitoring

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