Podcast
Questions and Answers
What is the primary purpose of a fuel pump in an aircraft fuel system?
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?
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?
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?
What is a key difference between electrically driven pumps and engine driven pumps?
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?
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?
Where is the fuel boost pump typically located?
Where is the fuel boost pump typically located?
What is the primary function of the fuel boost pump?
What is the primary function of the fuel boost pump?
What is the advantage of submerging the fuel boost pump in the fuel?
What is the advantage of submerging the fuel boost pump in the fuel?
What is the primary function of the detent plate in a cone type valve?
What is the primary function of the detent plate in a cone type valve?
What is the main difference between the two types of motor operated valves?
What is the main difference between the two types of motor operated valves?
What is the purpose of the spring-loaded pin in a cone type valve?
What is the purpose of the spring-loaded pin in a cone type valve?
What is the function of the cam in a poppet type fuel selector valve?
What is the function of the cam in a poppet type fuel selector valve?
What type of valve is most commonly used on small aircraft?
What type of valve is most commonly used on small aircraft?
What is the purpose of the cone in a cone type valve?
What is the purpose of the cone in a cone type valve?
What is the function of the shaft in a cone type valve?
What is the function of the shaft in a cone type valve?
What is the primary material used to make the cone in a cone type valve?
What is the primary material used to make the cone in a cone type valve?
What is a major disadvantage of jettisonable tanks in aviation?
What is a major disadvantage of jettisonable tanks in aviation?
Why are integral fuel tanks often used in aircraft design?
Why are integral fuel tanks often used in aircraft design?
What is typically used to seal the rivets and nut plates in an integral fuel tank?
What is typically used to seal the rivets and nut plates in an integral fuel tank?
What is the purpose of a low fuel pressure warning light?
What is the purpose of a low fuel pressure warning light?
What is indicated by valve-in-transit lights?
What is indicated by valve-in-transit lights?
Where are access panels, hand holes, and tank connections typically located in an integral fuel tank?
Where are access panels, hand holes, and tank connections typically located in an integral fuel tank?
What is the purpose of a fuel pressure gauge?
What is the purpose of a fuel pressure gauge?
What is the purpose of sealing the inspection openings in an integral fuel tank?
What is the purpose of sealing the inspection openings in an integral fuel tank?
On which part of the aircraft can valve-in-transit indicators be found?
On which part of the aircraft can valve-in-transit indicators be found?
What is the advantage of using integral fuel tanks in terms of space?
What is the advantage of using integral fuel tanks in terms of space?
Why are rigid tanks not commonly used in aircraft design?
Why are rigid tanks not commonly used in aircraft design?
What type of display system depicts valve positions graphically on screen?
What type of display system depicts valve positions graphically on screen?
What is the purpose of sealing the seams in an integral fuel tank?
What is the purpose of sealing the seams in an integral fuel tank?
What is used to move fuel to desired locations in an aircraft with multiple fuel tanks?
What is used to move fuel to desired locations in an aircraft with multiple fuel tanks?
What is used to show the valve position as OPEN or CLOSED?
What is used to show the valve position as OPEN or CLOSED?
What type of indicator is used to show the valve position in some aircraft?
What type of indicator is used to show the valve position in some aircraft?
What is the first step the tradesperson must take before removing the aeronautical product?
What is the first step the tradesperson must take before removing the aeronautical product?
What is the purpose of checking the Aircraft Maintenance Documentation (AMD) before removing the aeronautical product?
What is the purpose of checking the Aircraft Maintenance Documentation (AMD) before removing the aeronautical product?
What is the purpose of identifying the correct aircraft technical publication covering fuel system maintenance procedures?
What is the purpose of identifying the correct aircraft technical publication covering fuel system maintenance procedures?
What is the purpose of recording details of applicable restrictions in the AMD?
What is the purpose of recording details of applicable restrictions in the AMD?
What is the purpose of ensuring that Composite Tool Kit (CTK) use on the aircraft is accounted for?
What is the purpose of ensuring that Composite Tool Kit (CTK) use on the aircraft is accounted for?
What is the purpose of consulting with the Trade Supervisor/Maintenance Manager (MM) regarding Quality Inspection requirements?
What is the purpose of consulting with the Trade Supervisor/Maintenance Manager (MM) regarding Quality Inspection requirements?
What is the purpose of ensuring that the aircraft is safe to perform maintenance on?
What is the purpose of ensuring that the aircraft is safe to perform maintenance on?
What is the warning associated with aviation fuel in liquid and vapour form?
What is the warning associated with aviation fuel in liquid and vapour form?
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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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