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Questions and Answers

Why is measuring fuel quantity in pounds more accurate than in gallons?

Fuel density remains constant

Fuel volume increases when temperature decreases

Fuel volume varies with temperature change (correct)

Fuel volume varies with changes in atmospheric pressure

What should happen to engine RPM when moving the mixture control into the idle cutoff position?

It should remain the same until the cutoff is effected, then drop rapidly (correct)

It should remain constant

It should slightly increase before the engine starts to die

It should slightly decrease and then drop rapidly

How should valves downstream of boost pumps be checked during fuel system inspection?

With the pumps shut off

With the pumps operating (correct)

With the pumps at idle

With the pumps dormant

What is a characteristic of integral fuel tanks on transport aircraft?

They are supported by the aircraft structure Signup and view all the answers

What is the purpose of a normal fuel crossfeed system operation in multiengine aircraft?

To provide a means to maintain a balanced fuel load condition Signup and view all the answers

How many engine-driven fuel pumps are required per engine?

One fuel pump for each engine Signup and view all the answers

What would be indicated by the presence of fuel stains around a fuel nozzle?

Too much fuel pressure Signup and view all the answers

What would be most useful for locating and troubleshooting an internal fuel leak in an aircraft fuel system?

Maintenance manual diagrams and descriptions Signup and view all the answers

What type of fire-extinguishing agent is suitable for an aircraft brake fire?

dry powder chemical Signup and view all the answers

What triggers the thermocouple fire-warning system?

rate of temperature rise Signup and view all the answers

What is the purpose of a carbon monoxide detector in an aircraft?

detecting carbon monoxide Signup and view all the answers

What happens when portable carbon monoxide detectors detect carbon monoxide?

they turn red Signup and view all the answers

What types of devices are used in fire-detection systems?

all of the above Signup and view all the answers

What is a consequence of intentionally discharging a fire-extinguishing system?

a disk disappears from the fuselage Signup and view all the answers

What is a consideration when maintaining fire-detection systems?

all of the above Signup and view all the answers

What is the temperature range for a fire-extinguishing agent storage container with a pressure of 330 psig?

47 to 73°F Signup and view all the answers

What is the barometric altimeter indicating when the barometric scale is set at 29.92 "Hg?

Pressure altitude Signup and view all the answers

What type of mechanism would be found in a hydraulic pressure gauge?

Bourdon tube Signup and view all the answers

What is the maximum altitude loss permitted during an unpressurized aircraft instrument static pressure system integrity check?

100 feet in 1 minute Signup and view all the answers

What should be considered when selecting hardware for attaching bonding connections to an aircraft structure?

Mechanical strength, ease of installation, amount of current to be carried Signup and view all the answers

What type of pressure is used during the static system leakage check required by 14 CFR 91.411?

Static pressure Signup and view all the answers

What does a turn coordinator instrument indicate?

Both roll and yaw Signup and view all the answers

What is the fixed line mark attached to the compass bowl of a magnetic compass called?

Lubber line Signup and view all the answers

What is the basis of the operation of an angle of attack indicating system?

Detection of differential pressure at a point where the airstream flows in a direction not parallel to the true angle of attack of the aircraft Signup and view all the answers

What method is used to check for internal leakage of a fuel valve without removing it from the aircraft?

Draining the strainer bowl and watching for fuel flow Signup and view all the answers

What is the primary reason for locating the main fuel strainer at the lowest point in the fuel system?

To trap any small amount of water that may be present in the fuel system Signup and view all the answers

What is the purpose of bonding and grounding fuel system components?

To drain off static charges Signup and view all the answers

What type of fuel quantity indicating system allows the indicator to be located any distance from the tank(s)?

Electrical and electronic Signup and view all the answers

What unit is generally used to actuate the fuel pressure warning system?

Pressure-sensitive mechanism Signup and view all the answers

What occurs when a visual smoke detector is activated?

The test lamp illuminates and an alarm is provided automatically Signup and view all the answers

Under what condition can a carbon dioxide (CO2) hand-held fire extinguisher be used on an electrical fire?

If the horn is nonmetallic Signup and view all the answers

What type of smoke detectors use a measurement of light transmissibility in the air?

Photoelectric Signup and view all the answers

How can you determine the charge of a fire extinguisher container?

By weighing the container and its contents Signup and view all the answers

What is typically used to charge built-in aircraft fire-extinguishing systems?

Halogenated hydrocarbons and nitrogen Signup and view all the answers

Which instrument is commonly used to detect smoke in the cargo and/or baggage compartment of an aircraft?

Photoelectric cell Signup and view all the answers

What method is used to detect the thermal discharge of a built-in fire-extinguishing system?

A rupture of the red plastic disk in the thermal discharge line Signup and view all the answers

How are thermal switches wired in fire-detection systems with a single indicator light?

In series with each other and the light Signup and view all the answers

What should be done if the pressure of a fire extinguisher container is not between minimum and maximum limits?

Replace the extinguisher container Signup and view all the answers

What is a squib, as used in a fire-protection system?

A device for causing the fire-extinguishing agent to be released Signup and view all the answers

What should be done during removal or installation of discharge cartridges in aircraft fire-extinguishing systems?

The terminals should be grounded or shorted Signup and view all the answers

Study Notes

Aviation Instruments and Systems

A barometric altimeter indicates pressure altitude when the barometric scale is set at 29.92 "Hg.
A hydraulic pressure gauge uses a Bourdon tube mechanism.
During an unpressurized aircraft instrument static pressure system integrity check, a maximum altitude loss of 100 feet in 1 minute is permitted.

Aircraft Fuel Systems

Fuel quantity is more accurately measured in pounds instead of gallons because fuel volume varies with temperature changes.
When moving the mixture control on a normally operating engine into the idle cutoff position, engine RPM should slightly decrease and then drop rapidly.
In a fuel system, valves located downstream of boost pumps should be checked with the pumps operating.
Integral fuel tanks on transport aircraft are supported by the aircraft structure.
A normal fuel crossfeed system operation in multiengine aircraft provides a means to maintain a balanced fuel load condition.
The presence of fuel stains around a fuel nozzle indicates excessive airflow across the venturi.
To locate and troubleshoot an internal fuel leak in an aircraft fuel system, maintenance manual diagrams and descriptions are most useful.

Fire Detection and Extinguishing Systems

Fuel system components must be bonded and grounded to drain off static charges.
Electrical and electronic fuel quantity indicating systems have the advantage of being able to locate the indicator at any distance from the tank(s).
A pressure-sensitive mechanism is generally used to actuate the fuel pressure warning system.
When a visual smoke detector is activated, a lamp within the indicator illuminates automatically.
Carbon dioxide (CO2) hand-held fire extinguisher may be used on an electrical fire if the horn is nonmetallic.
Smoke detectors that use a measurement of light transmissibility in the air are called photoelectrical devices.
In some fire-extinguishing systems, evidence that the system has been intentionally discharged is indicated by the absence of a red disk on the side of the fuselage.
The proper fire-extinguishing agent to use on an aircraft brake fire is dry powder chemical.
The thermocouple fire-warning system is activated by a certain temperature.
Carbon monoxide detectors containing yellow silica gel will turn red when air samples contain carbon monoxide.
Built-in aircraft fire-extinguishing systems are ordinarily charged with carbon dioxide and nitrogen.
Smoke in the cargo and/or baggage compartment of an aircraft is commonly detected by a photoelectric cell.
A discoloring of the yellow plastic disk in the thermal discharge line is used to detect the thermal discharge of a built-in fire-extinguisher system.

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