Podcast
Questions and Answers
In what area of an aircraft would you find a carbon monoxide detector?
In what area of an aircraft would you find a carbon monoxide detector?
- Cockpit and/or cabin (correct)
- Cargo hold
- Galley
- Cockpit only
What occurs when a visual smoke detector is activated?
What occurs when a visual smoke detector is activated?
- A lamp within the indicator illuminates automatically (correct)
- An alarm sounds
- The indicator turns off
- The detector requires manual reset
The types of fire-extinguishing agents for aircraft interior fires are?
The types of fire-extinguishing agents for aircraft interior fires are?
- Water, carbon dioxide, dry chemical, and halogenated hydrocarbons (correct)
- Only dry chemical
- Halogenated hydrocarbons only
- Water and foam only
When air samples contain carbon monoxide, portable carbon monoxide detectors containing yellow silica gel will turn which color?
When air samples contain carbon monoxide, portable carbon monoxide detectors containing yellow silica gel will turn which color?
Smoke detection instruments are classified by their method of?
Smoke detection instruments are classified by their method of?
Smoke detectors which use a measurement of light transmissibility in the air are called?
Smoke detectors which use a measurement of light transmissibility in the air are called?
A contaminated carbon monoxide portable test unit would be returned to service by?
A contaminated carbon monoxide portable test unit would be returned to service by?
Which fire-detection system measures temperature rise compared to a reference temperature?
Which fire-detection system measures temperature rise compared to a reference temperature?
A carbon dioxide (CO(2)) hand-held fire extinguisher may be used on an electrical fire if the?
A carbon dioxide (CO(2)) hand-held fire extinguisher may be used on an electrical fire if the?
The proper fire-extinguishing agent to use on an aircraft brake fire is?
The proper fire-extinguishing agent to use on an aircraft brake fire is?
Smoke in the cargo and/or baggage compartment of an aircraft is commonly detected by which instrument?
Smoke in the cargo and/or baggage compartment of an aircraft is commonly detected by which instrument?
Light refraction smoke detectors are activated when the detector?
Light refraction smoke detectors are activated when the detector?
Why does the Fenwal fire-detection system use spot detectors wired parallel between two separate circuits?
Why does the Fenwal fire-detection system use spot detectors wired parallel between two separate circuits?
A fire-extinguisher container can be checked to determine its charge by?
A fire-extinguisher container can be checked to determine its charge by?
What is the color code for fire-extinguisher lines?
What is the color code for fire-extinguisher lines?
The most common cause of false fire warnings in continuous-loop fire-detection systems is?
The most common cause of false fire warnings in continuous-loop fire-detection systems is?
A thermocouple in a fire-detection system causes the warning system to operate because?
A thermocouple in a fire-detection system causes the warning system to operate because?
The thermocouple fire-warning system is activated by a?
The thermocouple fire-warning system is activated by a?
When used in fire-detection systems having a single indicator light, thermal switches are wired in?
When used in fire-detection systems having a single indicator light, thermal switches are wired in?
Built-in aircraft fire-extinguishing systems are ordinarily charged with?
Built-in aircraft fire-extinguishing systems are ordinarily charged with?
In reference to aircraft fire-extinguishing systems, (1) during removal or installation, the terminals of discharge cartridges should be grounded or shorted. (2) before connecting cartridge terminals to the electrical system, the system should be checked with a voltmeter to see that no voltage exists at the terminal connections. Regarding the above statements,
In reference to aircraft fire-extinguishing systems, (1) during removal or installation, the terminals of discharge cartridges should be grounded or shorted. (2) before connecting cartridge terminals to the electrical system, the system should be checked with a voltmeter to see that no voltage exists at the terminal connections. Regarding the above statements,
What method is used to detect the thermal discharge of a built-in fire-extinguisher system?
What method is used to detect the thermal discharge of a built-in fire-extinguisher system?
The thermal switches of a bimetallic thermal-switch type fire-detection (single-loop) system are heat-sensitive units that complete circuits at a certain temperature. They are connected in?
The thermal switches of a bimetallic thermal-switch type fire-detection (single-loop) system are heat-sensitive units that complete circuits at a certain temperature. They are connected in?
Using the chart, determine the temperature range for a fire-extinguishing agent storage container with a pressure of 330 PSIG. (Consider 330 PSIG for both minimum and maximum pressure.)
Using the chart, determine the temperature range for a fire-extinguishing agent storage container with a pressure of 330 PSIG. (Consider 330 PSIG for both minimum and maximum pressure.)
Determine what pressure is acceptable for a fire extinguisher when the surrounding area temperature is 33°F. (Rounded to the nearest whole number.)
Determine what pressure is acceptable for a fire extinguisher when the surrounding area temperature is 33°F. (Rounded to the nearest whole number.)
On a periodic check of fire-extinguisher containers, the pressure was not between minimum and maximum limits. What procedure should be followed?
On a periodic check of fire-extinguisher containers, the pressure was not between minimum and maximum limits. What procedure should be followed?
In some fire-extinguishing systems, evidence that the system has been intentionally discharged is indicated by the absence of a?
In some fire-extinguishing systems, evidence that the system has been intentionally discharged is indicated by the absence of a?
If a fire extinguisher cartridge is removed from a discharge valve, it should be?
If a fire extinguisher cartridge is removed from a discharge valve, it should be?
Which of the following are fire precautions which must be observed when working on an oxygen system?
Which of the following are fire precautions which must be observed when working on an oxygen system?
Which fire-extinguishing agent is considered to be the least toxic?
Which fire-extinguishing agent is considered to be the least toxic?
Maintenance of fire-detection systems includes the?
Maintenance of fire-detection systems includes the?
A squib, as used in a fire-protection system, is a?
A squib, as used in a fire-protection system, is a?
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Study Notes
Carbon Monoxide Detection
- Carbon monoxide detectors are located in the cockpit and/or cabin of an aircraft.
- Portable detectors containing yellow silica gel will turn green when air samples contain carbon monoxide.
Smoke Detection
- Visual smoke detectors activate an indicator lamp automatically.
- Smoke detection instruments are classified by their method of detection.
- Photoelectric devices measure light transmissibility in the air to detect smoke.
- Photoelectric cells commonly detect smoke in cargo and baggage compartments.
- Light refraction smoke detectors are activated by reflected light from smoke particles.
Fire-Extinguishing Agents
- Commonly used fire-extinguishing agents include water, carbon dioxide, dry chemical, and halogenated hydrocarbons.
- The proper agent for an aircraft brake fire is dry powder chemical.
- Bromotrifluoromethane (Halon 1301) is considered the least toxic fire-extinguishing agent.
Fire-Detection Systems
- Thermocouples in fire-detection systems measure temperature rises compared to a reference temperature, generating a small current when heated.
- Continuous-loop fire-detection systems often produce false warnings due to dents, kinks, or crushed sensor sections.
- Built-in fire-extinguishing systems are typically charged with halogenated hydrocarbons and nitrogen.
Maintenance and Procedures
- Inspect fire-extinguisher containers by weighing them to determine charge status.
- Replace fire-extinguisher containers that do not maintain pressure within minimum and maximum limits.
- A ruptured red plastic disk in the thermal discharge line indicates thermal discharge in built-in systems.
- Evidence of intentional discharge in some systems is indicated by the absence of a yellow disk on the fuselage.
Safety Precautions
- Follow fire precautions when working on oxygen systems: display 'No Smoking' signs, provide firefighting equipment, keep tools free from oil or grease, and avoid checking electrical systems.
- When removing a fire extinguisher cartridge, it should only be used with the original discharge valve assembly.
Fire-Warning Systems
- Thermal switches are connected in parallel with each other but in series with indicator lights to operate the warning system.
- The procedure for a contaminated carbon monoxide test unit involves installing a new indicating element.
Additional Notes
- Fire-extinguisher line color coding is brown.
- For fire-extinguisher storage containers, a pressure of 330 PSIG corresponds to a temperature range of 45 to 73°F.
- Acceptable pressure for fire extinguishers in a 33°F environment ranges from 215 to 302 PSIG.
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