General 1 Flashcards
When reading specific gravity of a fully charged lead acid battery what indicates a high state of charge?
Specific gravity reading between 1.275 and 1.300
What is considered the open circuit voltage of a fully charged 12 cell lead acid battery?
Approximately 26.4 V. 28 V are required for charging
What is the open circuit cell voltage of an NI – CAD battery?
1.25 V
What is a hazard when storing NI – CAD batteries and lead acid batteries in the same area?
The fumes from one type can contaminate the electrolyte in the other type
How does a capacitor store electricity?
By forming an electrostatic field, separated by an insulator
What does SLA mean with respect to an SLA battery?
Sealed lead acid
What electrical component converts direct current to alternating current
Inverter
How may you bring out important details of a part in aircraft drawing?
A detailed view draw to a larger scale
Describe information found in the title block of a blueprint:
Drawing size
Part or assembly name
Scale
Date
Draftsman
Film
Checker
Approving official
Describe bill of materials:
Everything needed to manufacture the part
What is the difference between an allowance and a tolerance used on aircraft blueprints?
Allowance - is the difference between the nominal dimension and the maximum and or minimum permissible sizes
Tolerance – the sum of the (+) and (-) allowance figures
Define clearance as used on aircraft blueprints
Dimension allowable between parts
What is an orthographic projection?
Different views of drawings
What might one view drawings represent an aircraft blueprints?
Thickness, gaskets, shims and plates
One, two and three view drawings are commonly used for:
Showing a shape of the object
What type of diagram would a mechanic use for troubleshooting?
Schematic diagrams
How can you determine if a drawing has been changed?
A record of the changes is listed in the revision block
Why are symbols used when drawing aircraft blueprints?
They are a form of shorthand and portray the characteristics of a component with a minimum amount of drawing
How is the arm for an item of equipment obtained when computing aircraft weight and balance?
Measuring the distance between the item and the datum
How is the moment for item of equipment obtained on computing aircraft, weight and balance?
Weight x arm = movement
What is a tare weight and how is it handled when making weight and balance calculations?
All items that can be removed then is subtracted
What is an aircraft loading graph?
A graph used for determining load distribution to keep the weight and operating C.G. within approved range
Why is accurate up-to-date empty weight center of gravity data so important?
Everything revolves around the empty weight
How is a positive moment obtained aft the datum?
By adding weight
How is a negative moment obtained aft the datum?
By removing weight
How is a positive moment obtained forward the datum?
By removing weight
How is a negative moment obtained forward the datum?
By adding weight
How can you determine the effect of a new item of equipment on the aircraft’s weight and balance without weighing the aircraft?
Basic computations , if the weight and balance records are up-to-date
What is ballast and why is it used in aircraft?
Any weight added or removed to obtain a desired C.G.
The CG limit of an aircraft is exceeded by installation of several equipment items in the engine compartment. How can this be corrected without removing or changing any of the newly installed equipment?
Use ballast to obtain the desired CG balance
What is the difference between fixed wing and helicopter CG range?
Helicopters have a more restricted CG range
If an aircraft is loaded, so that the aft CG limit is exceeded what undesirable flight characteristic is likely to result?
The aircraft will be tail heavy, and maybe unable to recover from a stall or spin
As you prepare an aircraft for weighing, you determine there is equipment aboard that is not permanently installed and recorded on the equipment list. What should you do with this equipment?
It should be removed from the aircraft
Where are leveling instructions found, and describe one method of leveling an aircraft
The instructions are found in the TCDS and a spirit level and plumb Bob can be used to level the aircraft.
Describe the two most common ways of showing the CG location and or CG range
In inches from the DATUM or in percent of mean aerodynamic chord (MAC)
What does the term mean aerodynamic chord (MAC) refer to?
The distance between the leading and trailing edge of the wing
What two types of fluid lines are commonly used in aircraft plumbing?
Metal tubing, and flexible hose
How is metal tubing classified in size?
By the outside diameter in 1/16 inch increments and by wall thickness
How are flexible hose sizes designated?
By the internal diameter measured in 1/16 inch increments
What caution must be observed when deburring the end of tubing after cutting?
Wall thickness is not fractured or reduced in size
Name two kinds of flares commonly used in aircraft plumbing systems
Single flare and double flare
Why would you not perform a specific gravity check of electrolyte in an NI – CAD battery?
The specific gravity does not change with the state of change
How many cells make up a lead acid battery rated at 24 V?
12 cells
When reading specific gravity of a fully charged lead acid battery what indicates a high state of charge?
Specific gravity reading between 1.275 and 1.300
What is considered the open circuit voltage of a fully charged 12 cell lead acid battery?
28 V are required for charging
What is the open circuit cell voltage of an NI-CAD battery?
1.25 V
What is a hazard when storing NI-CAD batteries and lead acid batteries is in the same area?
The fumes from one type can contaminate the electrolyte in the other type
Can NI – CAD batteries be interchangeable with lead acid types?
Yes
How does a capacitor store, electricity?
In the form of an electric charge or field that exists between two conductors separated by an insulator
What should be done when interchanging an NI-CAD battery with a lead acid battery?
The battery compartment must be cleaned, dried and neutralized with boric acid or ammonia, and then completely dried
What is a probable cause when troubleshooting an NI – CAD battery for failing to deliver it’s rated capacity?
Faulty cells or cell imbalance
What electrical component converts alternating current (AC) to direct current (DC)?
Rectifier
What electrical component converts direct current to alternating current?
Inverter
How may you bring out important details of a part in aircraft drawings?
A detailed view draw to a larger scale
Describe information found in the title block of a blueprint
-drawing size
-Part or assembly name
-Scale
-date
-draftsman
-film
-checker
-Approving official
Describe bill of materials:
Everything needed to manufacture the part
What is the difference between an allowance and a tolerance used on aircraft blueprints?
Allowance – is the difference between the nominal division and maximum and or minimum permissible sizes
Tolerance – is the sum of the + and the - allowance figures
Define clearance as used on aircraft blueprints
Dimension between parts
What is an orthographic projection?
Different views of drawings
What might one view drawing represent on an aircraft blueprint?
Thickness, gasket shims, and plates
1, 2 and 3 view drawings are commonly used for:
Showing a shape of an object
What type of diagram would a mechanic use for troubleshooting?
Schematic diagrams
How can you determine if a drawing has been changed?
A record in the revision block
Describe a centerline:
Long and short dashes
Describe a phantom line:
One long and two shorts
Describe a hidden line:
Short dashes evenly spaced
Why are symbols used when drawing aircraft blueprints?
They are a form of shorthand and portray the characteristics of a component with a minimum amount of drawing
How is the arm for an item equipment obtained when computing aircraft weight and balance?
Measuring the item to the item datum
How is the moment for item of equipment obtained when computing aircraft weight and balance?
Weight x arm = movement
What is a tare weight and how is it handled when making weight and balance calculations?
All items that can be removed then are subtracted
What is an aircraft loading graph?
A graph used for determining low distribution to keep the weight and operating C.G. within approved range
