AIRFRAME Flashcards
Which of the following are found in laminated integral electrically windshield system
4
- Autotransformer, - heat control relay, -heat control toggle system, and - indicating light
What nondestructive checking method is normally used to ensure that the correct amount of swaging has taken place when installing swaged-type terminals on A/C control cable
Use a terminal gauge to check the diameter of the swaged portion of the terminal
The dihedral of a wing may be measured by placing a straightedge and level protractor on the
Front spar
What is the minimum edge distance allowed for aluminum alloy single lap sheet splices containing a single row of rivets as compared to a joint with multiple rows, all rivets being equal in diameter
The minimum edge distance for the single row is equal to that for the multiple row
Which rivet is used for riveting nickel alloys
Monel
Where is the landing gear safety switch usually located
On the main gear shock strut
Internal leakage in a brake master cylinder unit can cause
The pedal to slowly creep down while pedal pressure is applied
After installation of a rebuilt hydraulic hand pump, it is found that the handle cannot be moved in the pumping direction (pressure stroke). The most likely cause is an incorrectly installed
Hand pump outport check valve
A/C flight control trim systems must be designed and installed so that the
Pilot can determine the relative position of the trim tab from the cockpit
(Fig 14) 1 hour after an oxygen system was charged for a leakage check, the oxygen pressure gauge read 460 psi @ 63 F; 6 hours later the temperature was 51 F. (A 5 psi change is the maximum allowable in a 6 hour period). What pressure gauge readings would be acceptable to remain within the allowable limits?
445 to 450 psi
The addition of avionics and associated antenna systems forward of the CG (center of gravity) limit will effect
Empty weight and useful load
Which of the following connects vacuum to the deicer boots when the systems is not in operation, to hold the boots tightly against the leading edges in flight
Distributor valve
Which statement concerning the 100 hour inspection of an airplane equipped with a push pull type control system is true
The threaded rod ends should be checked for the amount of thread engagement by means of the inspection hole provided
Bonding connections should be tested for
Resistance value
A relay is
A magnetically operated switch
(Fig. 10) The trunnion nut on an aircraft landing gear requires a torque of 320 inch pounds. To reach the nut, a 2 inch straight adapter must be used on an 18 inch torque wrench. How many foot pounds will be indicated on the torque wrench when the required torque of the nut is reached
24
What is one advantage of piston type hydraulic motors over electric motors
There is no fire hazard if the motor is stalled
The type of electric wire terminals used for most A/C applications in addition to providing good current carrying capabilities are designed primarily
To prevent circuit failure due to terminal disconnection
Which is considered good practice concerning the installation of acrylic plastics
When rivets are used, adequate spacer or other satisfactory means to prevent excessive tightening of the frame to the plastic should be provided
When patching a plywood skin, abrupt changes in cross sectional areas which will develop dangerous stress concentration should be avoided by using
Circular or elliptical patches
Fiberglass laminate damage that extends completely through one facing and into the core
Requires the replacement of the damaged core and facing
Select the alternative which best describes the function of the flute section of a twist drill
Forms the cutting edges of the drill point
The oxyacetylene flame for silver soldering should be
Neutral
A/C flight control trim systems must be designed and installed so that the
Pilot can determine the relative position of the trim tab from the cockpit
The addition of avionics and associated antenna systems forward of the CG (center of gravity) limit will effect
Empty weight and useful load
Which of the following connects vacuum to the deicer boots when the systems is not in operation, to hold the boots tightly against the leading edges in flight
Distributor valve
Which statement concerning the 100 hour inspection of an airplane equipped with a push pull type control system is true
The threaded rod ends should be checked for the amount of thread engagement by means of the inspection hole provided
Bonding connections should be tested for
Resistance value
A relay is
A magnetically operated switch
(Fig. 10) The trunnion nut on an aircraft landing gear requires a torque of 320 inch pounds. To reach the nut, a 2 inch straight adapter must be used on an 18 inch torque wrench. How many foot pounds will be indicated on the torque wrench when the required torque of the nut is reached
24
What is one advantage of piston type hydraulic motors over electric motors
There is no fire hazard if the motor is stalled
The type of electric wire terminals used for most A/C applications in addition to providing good current carrying capabilities are designed primarily
To prevent circuit failure due to terminal disconnection
Which is considered good practice concerning the installation of acrylic plastics
When rivets are used, adequate spacer or other satisfactory means to prevent excessive tightening of the frame to the plastic should be provided
When patching a plywood skin, abrupt changes in cross sectional areas which will develop dangerous stress concentration should be avoided by using
Circular or elliptical patches
Fiberglass laminate damage that extends completely through one facing and into the core
Requires the replacement of the damaged core and facing
Select the alternative which best describes the function of the flute section of a twist drill
Forms the cutting edges of the drill point
The oxyacetylene flame for silver soldering should be
Neutral
In installations where the ammeter is in the generator or alternator lead, & the regulator system does not limit the maximum current that the generator or alternator can deliver, the ammeter can be redlined at what percent of the generator or alternator rating
100%
Which repair would require a landing gear retraction test ?
Gear downlock microswitch
A universal propeller protractor used to measure the degrees of aileron travel should be zeroed
With aileron in the neutral position
A radar altimeter determines altitude by
Transmitting a signal and receiving back a reflected signal
Which instruments are connected to an A/C’s static pressure system only?
Vertical speed indicator & altimeter
Washing in the left wing of a monoplane, for purposes of rigging corrections after flight test, will have what effect on the lift and drag of what wing ?
Both drag and lift will increase due to increased angle of attack (AOA)
An airplane which has good longitudinal stability should have a minimum tendency to
Pitch
When considering an alteration, the criteria upon which the selection of electric cable size should be based are
Current carrying capacity and allowable voltage drop
An antiskid system is
An electrohydraulic system
The proper fire extinguishing agent to use on an A/C brake fire is
Dry powder chemical
Chattering of the hydraulic pump during operation is an indication
That air is entering the pump
Acetylene at a line pressure above 15 PSI
Is dangerously unstable
Where is fuel pressure taken for the pressure warning signal on most A/C engines
Fuel pressure line of the carburetor
Very often, repairs to a control surface require static rebalancing of the control surface. Generally, flight control balance condition may be determined by
The behavior of the trailing edge when the surface is suspended from its hinge points
Light reflection smoke detectors
Sense light reflected from smoke particles passing through a chamber
In some A/C with several fuel tanks, the possible danger of allowing the fuel supply in one tank to become exhausted before the selector valve is switched to another tank is prevented by the installation of
Fuel pressure warning signal system
If control cables are adjusted properly and the control surfaces tend to vibrate, the probable cause is
Worn attachment fittings
What type of remote reading fuel quantity indicating system has several probes installed in each fuel tank
Electronic
The oxyacetylene flame used for aluminum welding should be
Be neutral and soft
The classification for fiberglass reinforcement material that has high resistivity and the most common is
“ E “ stands for electrical glass
A/C which operate only AC generators (alternators) as a primary source of electrical power normally provide current suitable for battery charging through the use of
Step-down transformer and a rectifier
When installing pneumatic surface bonded type deicer boots
Remove all paint from the area to be covered by the deicer boot
The types of extinguishing agents for A/C interior fires are
4
- Water
- Dry chemical
- Carbon dioxide
- Halogenated hydrocarbons
What is the approximate drag load on an antenna with a frontal area of .137 square feet installed on an A/C with a speed of 275 mph
3.387 pounds
D= .000327 X A X V2
D = .000327 x ( .137 ) x 275 2 = 3.387
What is the condition of the refrigerant as it leaves the evaporator of a vapor cycle cooling system
Low pressure vapor
The air cycle cooling system produces cold air by
Extracting heat energy across an expansion turbine
Which section of a turbine engine provides high pressure bleed air to an air cycle machine for pressurization and air conditioning
Turbine compressor
What is normally used to bond non continuous stainless steel A/C components
Copper jumpers
Which channel of an autopilot detects changes in pitch attitude of an A/C
Elevator
A fully integrated autopilot controls the A/C around how many axis
3
- Longitudinal axis (roll)
- Lateral axis (pitch)
- Vertical (yaw)
The over voltage control automatically protects the generator system with excessive voltage is present by
Opening the shunt field circuit
The pin section of an AN/MS connector is normally installed on
The ground side of a circuit
When adding a rheostat to a light circuit to control the light intensity, it should be connected in
Series with the light
An A/C integral fuel tank in
Is part of the A/C structure
After installation of a rebuilt hydraulic hand pump, it is found that the handle cannot be moved in the pumping direction (pressure stroke). The most likely cause is an incorrectly installed
Hand pump output check valve
Why are centrifugal type boost pumps used in fuel systems of A/C operating at high altitude
To supply fuel under pressure to engine driven pumps
Movement about the longitudinal axis (roll) in a helicopter is effected by movement of the
Cyclic pitch control
How would an airspeed indicator be marked to show the best rate of climb speed (one engine inoperative)
A blue radial line
Which of the following would be most useful to locate and troubleshoot an internal fuel leak in an A/C fuel
A fuel system schematic
If no scratches are visible after transparent plastic enclosure materials have been cleaned, their surfaces should be
Covered with a thin coat of wax
A fuel pressure warning switch contacts close and warning light is turned on when
The fuel pressure drops below specified limits
The primary function of the flap overload valve is to
Prevent the flaps from being lowered at airspeeds which would impose excessive structural loads
Excessive wear on both of the sides of a control cable pulley groove is evidence of
Pulley misalignment
A DD rivet is heat treated before use to
Soften to facilitate riveting
A pressurization controller uses
3
- Barometric pressure
- cabin altitude
- cabin rate of change
Rivet gauge, or traverse pitch, is the distance between the
Centers of rivets in adjacent rows
What does a rectifier do
Changes alternating current (AC) into direct current (DC)
What is a cause of generator brush arcing
Low spring tension
When checking a freon system, a steady stream of bubbles in the sight gauge indicates the charge is
Low
Which of the following regulates the vacuum of the air pump to hold the deicing boots deflated when the pneumatic deicing system is off
Suction relief valve
The cabin pressure of an A/C in flight is maintained at the selected altitude by
Controlling the rate at which air leaves the cabin
What is the condition of the refrigerant as it enters the evaporator of a vapor cycle cooling system
Low pressure liquid
In a hovering helicopter equipped with a tail rotor, directional control is maintained by
Varying the pitch of the tail rotor blades
When approved, splices may be used to repair manufactured harnesses or installed wiring. The maximum # of splices permitted between any two connections is
One
An emergency locator transmitter (ELT) battery must be capable of furnishing power for signal transmission for at least
48 hours
Why are the iron cores of most coils laminated
To reduce the effects of eddy currents
What is one check for proper operation of a pitot/static tube heater after replacement
Ammeter reading
What is the primary purpose of the crossfeed system
To allow the feeding of any engine from any tank
The strength and stiffness of a properly constructed composite buildup depends primarily on
The orientation of the plies to the load direction
Internal leakage in a brake master cylinder unit can cause
The pedal to slowly creep down while pedal pressure is applied
Where is the landing gear safety switch usually located
On the main gear shock strut
A turn coordinator instrument indicates
Both roll and yaw
One of the main advantages of skydrol is it’s
Wide operating temperature
The function of the condenser in a freon cooling system is to
Transfer heat from the freon gas to ambient air
Where is information found concerning acceptable species substitutions for wood materials used in A/C repair
AC 43 -13 -1B
Dihedral angle of a wing may be measured by placing a straightedge and level protractor on the
Front spar
To be eligible for recharging, a DOT 3HT oxygen cylinder must have been hydrostatically tested every 3 years and be retired from service after
24 years or 4380 filling cycles
Which of the following connects vacuum to the deicer boots when the systems is not in operation, to hold the boots tightly against the leading edges in flight
Distributor valve
Which seals are used with petroleum base hydraulic fluids
Buna-n
The sharpest bend that can be placed in a piece of metal with out critically weakening the part is called the
Minimum radius of bend
What type of valve is used in the brake actuating line to isolate the emergency brake system from the normal power brake control valve system
Shuttle valve
Shallow scratches in sheet metal may be repaired by
Burnishing
What is the primary purpose of an autopilot
To relieve the pilot of control of the A/C during long periods of flight
What method is usually employed to control the temperature of an anti icing system using surface combustion heaters
Thermo cycling switches
Where electric cables must pass through holes in bulkheads, formers, ribs, firewalls, etc., the wires should be protected from chafing by
By using a suitable grommet
In an electronic type fuel quantity indicating system, the tank sensing unit is a
Capacitor
Oil canning of the sides of aluminum or steel electrical junction boxes is considered to be
Shorting hazard
The sight line on a sheet metal flat layout to be bent in a cornice or box is measured and marked
One radius from the bend tangent line that is placed under the brake
When servicing an air conditioning system that has lost all of its freon, it is necessary to
Check oil and add as necessary, evacuate the system, and and add freon
One purpose of the freewheeling unit required between the engine and the helicopter transmission is to
Automatically disengage the rotor from the engine in case of an engine failure
The inductor type inverter output voltage is controlled by the
DC stator field current
If the control stick of an A/C with properly rigged flight controls is moved forward (fwd.) and to the right, the left aileron will move
Down and the elevator will move down
Which of the following is most likely to cause thermal runaway in a nickel cadmium battery
Excessive current draw from the battery
When flags such as NAV, HDG, or GS are displayed on an HSI, the indication is
That the function is inoperative
Which characteristics apply to A\C hydraulic systems
3
- minimum maintenance requirements
- lightweight
- simple to inspect
Why does the fenwal fire detection system use spot detectors wired parallel between two separate circuits
A short may exist in either circuit without causing a false fire warning
Movement of an airplane along its lateral axis (roll) is also movement
Around or about the longitudinal axis controlled by the ailerons
When dope proofing the parts of the A/C structure that came in contact with doped fabric, which of the following provide an acceptable protective coating
Aluminum foil
and
Cellulose tape
Long range navigation (LORAN) systems determines A/C location by
Means of pulsed signals from ground stations
Composite inspections conducted by means of acoustic emission monitoring
Pick up the “ noise “ of corrosion or other deterioration occurring
An A/C pressurization cycle is normally considered to be
One complete series of events or operations that recur regularly
How is a shunt wound DC generator connected
Both fields are shunted across the armature
What is likely to occur if unhydrated wash primer is applied to unpainted aluminum and then about 30 to 40 minutes later a finish topcoat, when the humidity is low
Corrosion
What maintains normal windshield temperature control in an electrically heated windshield system
Thermistors
What should be used to melt the ice in a turbine engine if the compressor is immobile because of ice
Hot air
The only practical method of maintaining a constant voltage output from an A/C generator under varying conditions of speed and load is to vary the
Strength of the magnetic field
The poles of a generator are laminated to
Reduce eddy current losses
Fairleads should never deflect the alignment of a cable more than
3 degrees
The cabin pressurization modes of operation are
3 (D- U- I)
- Differential
- unpressurized
- isobaric
Which statement concerning soldering is correct
Joints in electric wire to be soldered should be mechanically secure prior to soldering
Turbine engine exhaust gas temperatures are measured by using
Chromel / alumel thermocouples
What physical factors are involved in the aspect ratio of airplane wings
Span and chord
Aluminum wire must be stripped very carefully because
Individual strands will break easily after being nicked
Major adjustments on equipment such as regulators, contractors, and inverters are best accomplished outside the airplane on test benches with necessary instruments and equipment. Adjustment procedure should be as outlined by
The equipment manufacturer
In a gaseous oxygen system, which of the following are vented to blow out plugs in the fuselage skin
Pressure relief valves
The cabin pressure control setting has a direct influence upon the
Outflow valve opening
A/C pressure fueling systems instructional procedures are normally placarded on the
Fuel control panel access door
When routing a fuel line between two rigidly mounted fittings the line should
Have at least one bend between such fittings
Which statement is true in regard to welding heat treated magnesium
The welded section does not have the strength of the original metal
What type of selector valve is one of the most commonly used in hydraulic systems to provide for simultaneous flow of fluid into and out of a connected actuating unit
Four port, closed center valve
True or false
A/C instruments are color-coded to direct attention to operational ranges and limitations
True
If a brake debooster is used in a brake system, it’s position in the system will be
Between the brake control valve and the brake actuating cylinder
Two possible sources of heat for the operation of a wing thermal anti-icing system are
Combustion heater and exhaust gases
What icing condition may occur when there is no visible moisture present
Carburetor ice
In the diluter demand oxygen regulator, when does the demand valve operate
When the user breathes
A/C instruments should be marked and graduated in accordance with (IAW)
The specific A/C maintenance or flight manual
An A/C oxygen bottle may be considered airworthy if it has been hydrostatically tested and identified
- the test date
- DOT number
- serial number stamped on the cylinder near the neck
What is the main purpose of servo in an autopilot system
Move the control surface as commanded
Which of the following are characteristics of a chemical or solid state oxygen system
- A volume storage capacity about 3 times that of compressed oxygen
- The system generators are inert below 400 degrees F even under severe impact
Two types of hydraulic fluids currently being used in civil A/C are
- Mineral base and phosphate ester base
Hydraulic system accumulators serve which of the following functions
3
- Dampen pressure surges
- Supplement the system pump when demand is beyond the pump’s capacity
- Store power for limited operation of components if the pump is not operating
A landing gear position and warning system will provide a warning in the cockpit when the throttle is
Retarded and gear is not down and locked
What should be checked when a shock strut bottoms during a landing
Fluid level
The primary purpose of stall strips is to
Stall the inboard portion of the wings first
Microswitches are used primarily as limit switches to
Control electrical units automatically
A common cause of slow actuation of hydraulic components is
Internal leakage in the actuating unit
Phosphate ester base hydraulic fluid is very susceptible to contamination from
Water in the atmosphere
How may the antiknock characteristic of a fuel be improved
By adding a knock inhibitor
A fully charged hydraulic accumulator provides
A source for additional hydraulic power when heavy demands are placed on the system
