General QB

8/21/2019 General QB

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CAAV QUESTION BANK AIRCRAFT GENERAL

GENERAL

1. In an ac circuit, the effective voltage is

A- equal to the maximum instantaneous voltage.

B- greater than the maximum instantaneous voltage.

C- less than the maximum instantaneous voltage.

The effective voltage of sine wave alternating current is 0.707 time its peak voltage.

The effective voltage, also called the root-mean-square (ms) voltage, is the voltage

measured b most of the !" voltmeters. #eak voltage is measured with either a special

peak voltmeter or an oscilloscope.

2. The amount of electricity a capacitor can store is irectly proportional to the

A- distance between the plates and inversely proportional to the plate area.

B- plate area and is not affected by the distance between the plates.

C- plate area and inversely proportional to the distance between the plates.

Three factors affect the amount of electricit a capacitor can store$

%. The area of the plates. The larger the plate area, the greater the capacit.

&. The thickness of the dielectric (the distance between the plates). The closer the plates

are together, the stronger the electrical field will be and the greater the capacit.

'. The material from which the dielectric is made (its dielectric constant). The higher the

dielectric constant, the greater the capacit.

!. "hen ifferent rate capacitors are connecte in parallel in a circuit, the total

capacitance is

(Note C! " C! # C$ # C%...&

A - less than the capacitance of the lowest rated capacitor.B- equal to the capacitance of the highest rated capacitor.

C- equal to the sum of all the capacitances.

hen capacitors are connected in parallel, the effective area of the plasters add, and the

total capacitance is the sum of the individual capacitances.

#. "hich re$uires the most electrical po%er uring operation&

(Note ! horsepower " ') watts&

A- A !$-volt motor requiring * amperes.

B- +our %,-watt lamps in a !$-volt parallel circuit.

C- wo lights requiring % amperes each in a $-volt parallel system.

The %&-volt motor requires * watts of power.

The four '0-watt lamps require %&0 watts of power.

The two &+-volt, '-amp lights require %++ watts of power.

'. (o% much po%er must a 2#)volt generator furnish to a system %hich contains the

follo%ing loas&

N/ 0A/N1

2ne motor ('3 percent efficient& .......................... !43 hp

hree position lights ......................................... $, watts each

2ne heating element .......................................... 3 amp2ne anti-collision light ....................................... % amp

(Note q horsepower " ') watts&

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A- ,$ watts.

B- %*3 watts.

C- 3, watts.

The %-horsepower motor that is 7 percent efficient requires % watts.

The three position lights require a total of *0 watts.

The heating element requires %&0 watts.The anti-collision light requires 7& watts.

The total power the generator must produce is +% watts.

*. A 12)volt electric motor has 1,+++ %atts input an 1 horsepo%er output.

aintaining the same efficiency, ho% much input po%er %ill a 2#)volt, 1)horsepo%er

electric motor re$uire&

(Note ! horsepower " ') watts&

A- !5,,, watts.

B- $5,,, watts.

C- 3,, watts.

The power produced b an electric motor is the product of its voltage and its current.

! %&-volt motor will require '.' amps of current for its %,000 watts of input power to

produce 7+* watts (% horsepower) of output power.

! &+-volt-volt motor operating at the same efficienc will also require %,000 watts of input

power for its 7+* watts of output power, but it will need onl +%.7 amps of current.

-. The potential ifference et%een t%o conuctors %hich are in insulate from each

other is measure in

A- volts.

B- amperes.C- coulombs.

The potential difference between two conductors is a measure of the electrical pressure

difference between the conductors.

/lectrical pressure is measured in volts.

/.The correct %ay to connect a test voltmeter in a circuit is

A- in series with a unit.

B- between the source voltage and the load.

C- in parallel with a unit.

! voltmeter must alwas be connected in a circuit in parallel with the unit whose voltage is

to be measured.

0."hich term means .++1 ampere&

A- 6icroampere.

B- 7iloampere.

C- 6illiampere.

The metric prefi 1milli-1 means one thousandth.

0.00% ampere is one milliampere.

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1+. A cain entry light of 1+ %atts an a ome light of 2+ %atts are connecte in

parallel to a !+)volt source. If the voltage across the 1+)%att light is measure, it %ill

e

A- equal to the voltage across the $,-watt light.

B- half the voltage across the $,-$watt light.

C- one-third of the input voltage.

hen lights are connected in parallel across a voltage source, the voltage across each of

the lights will be the same as the voltage of the source.

11. ++2 e$uals

A- $, volts.

B- $., volts.

C- .$ volt.

! 23 is kilovolt, or %,000 volts. Two thousandths (.00&) of a kilovolt is equal to &.0 volts.

12. "hat unit is use to e3press electrical po%er&

A- 8olt.

B- 9att.

C- Ampere.

The volt is a measure of electrical pressure.

The watt is a measure of electrical power.

The ampere is a measure of electrical current flow.

1!."hich statement is correct %hen mae in reference to a parallel circuit&

A- he current is equal in all portions of the circuit.B- he total current is equal to the sum of the currents through the individual branches of

the circuit.

C- he current in amperes can be found by dividing the :6+ in volts by the sum of the

resistors in ohms.

!ccording to 2irchhoff4s current law, the current flowing in a parallel circuit is equal to

the sum of the currents flowing through each of the individual branches of the circuit.

1#. 4ioes are use in electrical po%er circuits primarily as

A- switches.

B- rectifiers.C- relays.

! diode (either a semiconductor diode or an electron-tube diode) is an electron check

valve.

! diode allows electrons to pass in one direction, but blocks their flow in the reverse

direction. This is the action of a rectifier.

1'. A circuit has an applie voltage of !+ volts an a loa consisting of a 1+)ohm

resistor in series %ith a 2+)ohm resistor. "hat is the voltage rop across the 1+)ohm

resistor&

A- !, volts.B- $, volts.

C- %, volts.

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5n a series circuit, the voltage drop across each resistor is determined b its resistance.

5n this circuit, the total resistance is '0 ohms and the total voltage is '0 volts.

6ne amp of current flows through each resistor and this gives a %0-volt drop across the

%0-ohm resistor.

/ % 8

% %0 %0 volts

1*. "hich is correct concerning a parallel circuit&

A- otal resistance will be smaller than the smallest resistor.

B- otal resistance will decrease when one of the resistances is removed.

C- otal voltage drop is the same as the total resistance.

5n a parallel circuit each resistor forms a path for the current to follow and the total

resistance is alwas smaller than that of the smallest resistor.

1-. A thermal s%itch, as use in an electric motor, is esigne to

A- close the integral fan circuit to allow cooling of the motor.

B- open the circuit in order to allow cooling of the motor.

C- reroute the circuit to ground.

! thermal switch is another name for a built-in thermal circuit breaker. This is a circuit

protection device that opens the circuit when the windings of the motor get too hot.

5f the motor overheats for an reason, the thermal switch will open the power circuit to the

motor and allow the motor to cool.

1/. "hen referring to an electrical circuit iagram, %hat point is consiere to e at5ero voltage&

A- he circuit brea;er.

B- he switch.

C- he ground reference.

The ground reference, shown on a schematic diagram as a triangular- shaped series of

parallel lines, is the point considered to be at 9ero voltage.

!ll voltage, both positive and negative, are measured from this ground reference.

10. 6Refer to 7igure 2#.8 "hich statement concerning the epicte logic gate is true&

A- Any input being ! will produce a , output.B- Any input being ! will produce a ! output.

C- All inputs must be ! to produce a ! output.

7igure 2#

This is an 68 gate. !n time there is a % on an of the inputs, there will be a % on the

output.

2+. 6Refer to 7igure 2'.8 In a functional an operation circuit, the epicte logic gate9s

output %ill e +

A- only when all inputs are ,.

B- when all inputs are !.C- when one or more inputs are ,.

7igure 2'

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This is !:; gate. !n time one or more of the inputs do not have a % on them (have a 0 on

them), the output will be 0.


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C- A wiring diagram.

!n electrical wiring diagram shows the wire si9e required for a particular installation.

2*. :chematic iagrams are est suite for %hich of the follo%ing&

A- =howing the visual details of individual components in a system.

B- =howing the overall location and appearance of components in a system.C- roubleshooting system malfunctions.

! schematic diagram shows the relative location of all of the parts in a sstem, but does

not give the location of the parts in the aircraft. =chematic drawings are of great help

when troubleshooting a sstem.

2-. "hat tas drain fuel and

hydraulic fluid.

B- 0emove all items on the aircraft equipment list> drain fuel5 compute oil and

hydraulic fluid weight.

C- 0emove all items except those on the aircraft equipment list> drain fuel and fill

hydraulic reservoir.

%+ "


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B- he result or a weight being added or removed and its location relative to the

datum.

C- he location of the datum in reference to the aircraft C1.

! moment is a force that causes rotation about a point, and in order to specif the direction

of the rotation, signs (?) and (-) are assigned to the moment.

5n aircraft weight and balance, a positive moment is one that causes the aircraft nose to goup, and a negative moment is one that causes the nose to go down.

=ince a moment is the product of weight and the distance from the datum, and both of these

are signed values, we have four choices for the sign of the moment$

!. ! positive weight (weight added) and a positive arm (arm behind the datum) give a

positive moment.

&. ! positive weight and a negative arm (arm ahead of the datum) give a negative moment.

'. ! negative weight (weight removed) and a positive arm give a negative moment.

+- ! negative weight and a negative arm gives a positive moment.

!1. The ma3imum %eight of an aircraft is the

A- empty weight plus crew5 maximum fuel5 cargo5 and baggage.

B- empty weight plus crew5 passengers5 and fixed equipment.

C- empty weight plus useful load.

The useful load of an aircraft is found b subtracting the empt weight of the aircraft from

the maimum weight. Therefore, the maimum weight is the sum of the empt weight and

the useful load.

!2. ?ero fuel %eight is the

A- dry weight plus the weight of full crew5 passengers5 and cargo.

B- basis operating weight without crew5 fuel5 and cargo.C- maximum permissible weight of a loaded aircraft (passengers5 crew5 and cargo&

without fuel.

The 9ero fuel weight of an aircraft is the maimum allowable weight of the loaded aircraft

without fuel. The weight of the cargo, passengers, and crew are included in the 9ero fuel

weight.

!!. The useful loa of an aircraft is the

A- difference between the maximum gross weight and empty weight.

B- difference between the net weight and total weight.

C- sum of the empty weight and the maximum gross weight.

The useful load of an aircraft is determined b subtracting the empt weight from the

maimum allowable gross weight.

!#. The ma3imum %eight as use in %eight an alance control of a given aircraft can

normally e foun

A- by adding the weight of full fuel5 pilot5 passengers5 and maximum allowable

baggage to the empty weight.

B- in the Aircraft =pecification or ype Certificate @ata =heet.

C- by adding the empty weight and payload.

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Tpe "ertificate ;ata =heets or !ircraft =pecifications include the maimum certificated

gross weight of an aircraft.

!'. (yraulic tuing, %hich is amage in a locali5e area to such an e3tent that

repair is necessary, may e repaire

A- by cutting out the damaged area and utili


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B- !4%$ inch or $, percent of wall thic;ness5 whichever is less.

C- !, percent of the wall thic;ness.

=cratches or nicks are allowed in a piece of aluminum allo tubing provided t is no deeper

than %0 percent of the wall thickness of the tube, and it is not in the heel of a bend.

=cratches and nicks should be burnished out of the tube, to prevent stress concentrations.

#+. "hich statement concerning @ernoulli9s principle is true&

A- he pressure of a fluid increases at points where the velocity of the fluid

increases.

B- he pressure of a fluid decreases at points where the velocity of the fluid

increases.

C- /t applies only to gases and vapori


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discontinuities, thickness, and allo or heat-treat condition of the material. /dd current

inspection is used to locate defects both on the surface and below the surface.

##. nless other%ise specifie, tor$ue values for tight)enting aircraft nuts an olts

relate to

A- clean5 dry threads.

B- clean5 lightly oiled threads.C- either dry or lightly oiled threads.

The amount of torque used to screw a nut onto a blot is critical in determining the integrit

of a bolted >oint.


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@olts for installation in an aircraft structure should be selected so that their grip length

(the length of the un-threaded shank) is equal to the thickness of the material being >oined.

#0. Generally speaoined.

'+. A particular component is attache to the aircraft structure y the use of an

aircraft olt an a castle tension nut comination. If the cotter pin hole oes not align

%ithin the recommene tor$ue range, the acceptale practice is to

A- exceed the recommended torque range by no more than !, percent.

B- tighten below the torque range.

C- change washers and try again.

hen tightening castle nuts on bolts, the cotter pin holes ma not line up with the slots in

the nuts at maimum recommended torque, plus friction drag. 5f the hole and nut

castellation do not align, change washers and tr again. /ceeding the maimum

recommended torque is not recommended.

'1. 4uring starting of a turine po%erplant using a compresse air stater, a hung

start occurre. :elect the proper proceure.

A- Advance power lever to increase 06.B- 0e-engage the starter.

C- =hut the engine down.

! hung start of a turbo>et engine is a start in which the engine lights off as it should, but

does not accelerate to a speed that allows it to operate without help from the stater.

!ntime a hung start occurs, the engine should be shut down and the cause of the problem

found and corrected.

'2. A hung start in a =et engine is often cause y

A- malfunctions in the ignition system.

B- the starter cutting off too soon.C- an excessively rich fuel4air mixture.

! hung, or false, start is often the result of insufficient power to the stater or the starter

cutting off before the engine reaches its self-accelerating speed.

'!. "hich statement elo% reflects a typical re$uirement %hen to%ing some aircraft&

A- @ischarge all hydraulic pressure to prevent accidental operation of the

nosewheel steering mechanism.

B- ailwheel aircraft must be towed bac;ward.

C- /f the aircraft has a steerable nosewheel5 the torquelin; loc; should be set to full

swivel.

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hen towing a triccle-gear airplane, the nose wheel torque-link lock should either be

disconnected or set to full swivel, whichever the aircraft manufacturer recommends.

5f this is not done, there is a good possibilit that the tow bar can turn the nose wheel

enough to break the steering stops.

'#. "hen approaching the front of an iling =et engine, the ha5ar area e3tens

for%ar of the engine appro3imatelyA- !, feet.

B- !3 feet.

C- $3 feet.

5t is etremel dangerous to approach an operating turbo>et engine from either ahead or

behind.

The ha9ard area etends out ahead of an idling turbo>et engine for about & feet.

''. "hich of the follo%ing is the most satisfactory e3tinguishing agent for use on a

caruretor or intaet engine for approimatel %00 feet.

'/. If a hot start occurs uring starting of a turine po%erplant, %hat is the liet engine is one in which the engine starts normall but the ehaust-gas temperature eceeds its allowable limits.



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Dot starts are usuall caused b too rich a fuel-air miture. (There was too much fuel for

the amount of air being moved through the engine b the compressor).

'0. "hen to%ing a large aircraft

A- a person should be in the coc;pit to watch for obstructions.

B- persons should be stationed at the nose5 each wingtip5 and the empennage at all

times.C- a person should be in the coc;pit to operate bra;es.

hen a large aircraft is being towed, there should be a person in the cockpit to operate the

brakes in the event of an emergenc.

*+. Intergranular corrosion in aluminum alloy parts

A- may be detected by surface pitting5 and white5 powdery deposit formed on the

surface of the metal.

B- commonly appears as threadli;e filaments of corrosion products under a dense

film of paint.

C- cannot always be detected by surface indications.

5ntergranular corrosion forms along the grain boundaries within an aluminum allo.

=ince this tpe of corrosion does not necessaril etend all the wa to the surface of the

metal in its earl stages, it is quite possible for intergranular corrosion to reach an

advanced state before it shows up on the surface.

*1. A primary cause of intergranular corrosion is

A- improper heat treatment.

B- dissimilar metal contact.

C- improper application of primer.

6ne of the primar causes for intergranular corrosion is improper heat treatment.

5f there is a dela in the time between the removal of a metal part from the heat treatment

oven and the time the part is quenched, the grains of the metal have an opportunit to

grow large enough that an electrical potential eists across the grain boundaries.

This potential within the metal causes the formation of intergranular corrosion.

*2. "hy is a plastic surface flushe %ith fresh %ater efore it is cleane %ith soap an

%ater&

A- o prevent cra


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C- 9ipe the tire with a cloth dampened with aromatic naphtha and then wipe dry

with a clean cloth.

hen an aircraft tire comes in contact with oil or grease, remove all of the ecess material

b wiping it with a dr cloth. Then wash the tire with a solution of mild soap and warm

water. 8inse the tire with fresh water and dr it with compressed air.

*#. Galvanic corrosion at the interface of a issimilar metal part may est e

prevente y

A- placing a nonporous dielectric material between the surfaces.

B- conducting frequent inspections and ;eeping all exposed areas of the part clean.

C- sealing exposed seam edges with a recommended sealing compound.

Calvanic corrosion can form between dissimilar metals when the are in contact with each

other and are covered with an electrolte.

Calvanic corrosion can be prevented b insulating the metals from each other b placing a

nonporous dielectric material between the surfaces. This can be in the form of a primer

and a laer of pressure-sensitive vinl tape.

*'. Borrosion cause y galvanic action is the result of

A- excessive anodi


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*/. If %or< performe on an aircraft has een one satisfactorily, the signature of an

authori5e person on the maintenance recors for maintenance or alterations

performe constitutes

A- approval of the aircraft for return to service.

B- approval for return to service only for the wor; performed.

C- only verification that the maintenance or alterations were performed referencing

maintenance data.

The signature constitutes the approval for return to service onl for the work performed.

*0. "hat is the means y %hich the BAA notifies aircraft o%ners an other

intereste persons of unsafe conitions an prescries the conition uner %hich the

prouct may continue to e operate&

A- Airworthiness @irectives.

B- Aviation 6aintenance Alerts.

C- Aviation =afety @ata.

5f a condition is found that causes a particular design of aircraft to fail to meet its

certification for airworthiness, the "!!3 can issue an !irworthiness ;irective (!;).

!n !irworthiness ;irective describes the conditions that must be met to allow the aircraft

to continue to be operated.

-+. "ho is responsile for up


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!fter a mechanic holding the appropriate ratings completes a %00-hour inspection of an

aircraft, the appropriate entries must be made in the aircraft maintenance record before

the aircraft can be returned to service.

-!. The force that can e prouce y an actuating cyliner %hose piston has a cross)

sectional area of a s$uare inches operating in a 1,+++ C:I hyraulic system is most

nearlyA- %5,,, pounds.

B- !53 pounds.

C- !5,,, pounds.

The force a hdraulic actuator can eert is determined b the area of the piston and the

pressure of the fluid acting on the piston.

! pressure of %,000 pounds per square inch, acting on a piston with an area of ' square

inches, will produce a force of ',000 pounds.

-#. The oiling point of a given li$ui varies

A- directly with pressure.

B- inversely with pressure.

C- directly with volume.

The boiling point of a liquid varies directl with the pressure above the liquid. The greater

the pressure, the higher the boiling point.

-'. The spee of soun in the atmosphere

A- varies according to the frequency of the sound.

B- changes with a change in temperature.

C- changes with a change in pressure.

The speed of sound in the atmosphere varies with the temperature of the atmosphere.

-*. If the volume of a confine gas is oule 6%ithout the aition of more gas8, the

pressure %ill 6assume the temperature remains constant8.

A- increase in direct proportion to the volume increase.

B- remain the same.

C- be reduced to one-half its original value.

The pressure of a gas in an enclosed container varies inversel as the volume of the

container, if the absolute temperature of the gas remains constant.;oubling the volume of the container will decrease the pressure of the enclosed gas to a

value of one-half its original pressure.

--. If the temperature of a confine li$ui is hel constant an its pressure is triple,

the volume %ill

A- triple.

B- be reduced to one-third its original volume.

C- remain the same.

! liquid is considered to be a non-compressible fluid. 5ts volume changes with a change in

its temperature but it remains relativel constant as its pressure changes.5f the pressure on a confined liquid is tripled, the volume of the liquid will remain virtuall

the same.



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-/. If the flui pressure is /++ C:I in a 1D2) inch line supplying an actuating cyliner

%ith a piston area of 1+ s$uare inches, the force e3erte on the piston %ill e

A- 5,,, pounds.

B- *5,,, pounds.

C- *,, pounds.

The si9e of the line that supplies fluid to an actuating clinder has nothing to do with the

amount of force the piston in the clinder can eert.

hen a pressure of 00 psi acts on a piston with an area of %0 square inches, a force of

00 %0 ,000 pounds is produced.

-0. (o% many, if any, factors are necessary to etermine po%er&

!. +orce exerted.

$. @istance the force moves.

%. ime required to do the wor;.

A- 2ne.

B- wo.

C- hree.

#ower is the time rate of doing work.

5n order to determine the amount of work done, we must know the amount of force used

and the distance through which this force acted. ob, we must know the force, the distance and

the time.

/+. "hich statement concerning heat anDor temperature is true&

A- here is an inverse relationship between temperature and heat.

B- emperature is a measure of the ;inetic energy of the molecules of any

substance.

C- emperature is a measure of the potential energy of the molecules of any

substance.

Deat is a form of energ, and temperature is a measure of the intensit of the kinetic energ

of the molecules in a substance.

Deat energ, in the form of latent heat, can be added to an ob>ect or taken from it without

changing its temperature. @ut, the temperature of an ob>ect changes directl with theamount of sensible heat put into it or taken from it.

/1. An airplane %ing is esigne to prouce lift resulting from

A- positive air pressure below and above the wingDs surface along with the

downward deflection of air.

B- positive air pressure below the wingDs surface and negative air pressure above

the wingDs surface along with the downward deflection of air.

C- negative air pressure below the wingDs surface and positive air pressure above

the wingDs surface along with the downward deflection of air.

!erodnamic lift is produced on an airfoil b the pressure difference across the airfoilalong with the downward deflection of air. The pressure below the wing surface is greater



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than that above the wing. The pressure below the wing ma be considered positive and that

above the wing negative.

/2. The purpose of aircraft %ing iheral is to

A- increase lateral stability.

B- increase longitudinal stability.

C- increase lift coefficient of the wing.

;ihedral or the upward slant of the wing from the fuselage is used to increase the lateral

stabilit. Fateral stabilit is roll stabilit and is stabilit about the longitudinal ais.

/!. Air%orthiness 4irectives are issue primarily to

A- provide information about malfunction or defecttrends.

B- present recommended maintenance procedures for correcting potentially

ha


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The !ircraft =pecifications or Tpe "ertificate ;ata =heets list all of the allowable engine-

propeller combinations approved for a specific aircraft.

/-) "here are technical escriptions of certificate propellers foun&

A- Applicable Airworthiness @irectives.

B- Aircraft =pecifications.

C- ropeller ype Certificate @ata =heets.

Technical specifications for certificated aircraft propellers are found in the propeller Tpe

"ertificate ;ata =heets.

//. "hat information is generally containe in Aircraft :pecifications or Type

Bertificate 4ata :heets&

A- :mpty weight of the aircraft.

B- seful load of aircraft.

C- Control surface movements.

The amount of control surface movement determines the structural loads that can be put

on an aircraft and also the flight characteristics of the aircraft.

@ecause this information is so critical, it is included on the Tpe "ertificate ;ata =heet of

an aircraft.

/0. "hat is the maintenance recoring responsiility of the person %ho complies %ith

an Air%orthiness 4irective&

A- Advise the aircraft owner4operator of the wor; performed.

B- 6a;e up entry in the maintenance record of that equipment.

C- Advise the CAA8 of the wor; performed5 by submitting an 0:20.

hen a technician complies with an !irworthiness ;irective, it is his or her responsibilit

to make an entr in the maintenance record of the affected equipment. This entr must

include the method of compliance and the date of compliance.

0+) A repair, as performe on an airframe, shall mean

A- the up;eep and preservation of the airframe including the component parts

thereof.

B- the restoration of the airframe to a condition for safe operation after damage or

deterioration.

C- simple or minor preservation operations and the replacement of small standard

parts not involving complex assembly operations.

! repair to an aircraft structure is an operation that restores the structure to a condition

for safe operation after it has become deteriorated or has been damaged.

General QB

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