PP Engine Fire Protection Systems

Which of the following fire detection systems are commonly used in an engine nacelle?

Fire detection control unit.
Thermocouple detecter.
Kidde continuous-loop.

What is the function of a fire detection system?

To discharge the powerplant fire-extinguishing system at the origin of the fire.
To activate a warning device in the event of a powerplant fire.
To identify the location of a powerplant fire.

Refer to Figure 2. Determine the fire extinguisher container pressure limits when the temperature is 75 degrees F.

328 minimum and 415 maximum.
330 minimum and 419 maximum.
338 minimum and 424 maximum.

How are most aircraft turbine engine fire-extinguishing systems activated?

Electrically discharged cartridges.
Manual remote control valve.
Pushrod assembly.

How does carbon dioxide (CO₂) extinguish an aircraft engine fire?

Contact with the air converts the liquid into snow and gas which smothers the flame.
By lowering the temperature to a point where combustion will not take place.
The high pressure spray lowers the temperature and blows out the fire.

What retains the nitrogen charge and fire-extinguishing agent in a high rate of discharge (HRD) container?

Breakable disk and fusible disk.
Pressure switch and check tee valve.
Pressure gauge and cartridge.

A continuous-loop fire detector is what type of detector?

Spot detector.
Overheat detector.
Rate-of-temperature-rise detector.

What is the operating principle of the spot detector sensor in a fire detection system?

Resistant core material that prevents current flow at normal temperatures.
A conventional thermocouple that produces a current flow.
A bimetallic thermoswitch that closes when heated to a high temperature.

How is the fire-extinguishing agent distributed in the engine section?

Spray nozzles and fluid pumps.
Nitrogen pressure and slinger rings.
Spray nozzles and perforated tubing.

Which of the following is the safest fire-extinguishing agent to use from a standpoint of toxicity and corrosion hazards?

Dibromodifluoromethane (Halon 1202).
Bromochlorodifluoromethane (Halon 1211).
Bromotrifluoromethane (Halon 1301).

Which of the following is NOT used to detect fires in reciprocating engine nacelles?

Smoke detectors.
Rate-of-temperature-rise detectors.
Flame detectors.

What is the principle of operation of the continuous-loop fire detector system sensor?

Fuse material which melts at high temperatures.
Core resistance material which prevents current flow at normal temperatures.
A bimetallic thermoswitch which closes when heated to a high temperature.

The most satisfactory extinguishing agent for a tailpipe or intake fire is

carbon dioxide.
dry chemical.
methyl bromide.

The explosive cartridge in the discharge valve of a fire-extinguisher container is

a life-dated unit.
not a life-dated unit.
mechanically fired.

Why does one type of Ferwal fire detection system use spot detectors wired in parallel between two separate circuits?

To provide an installation that is equal to two separate systems: a primary system and a secondary, or back-up system.
So that a double fault may exist in the system without sounding a false alarm.
So that a single fault may exist in the system without sounding a false alarm.

Which of the following fire detection systems measures temperature rise compared to a reference temperature?

Thermocouple.
Thermal switch.
Lindberg continuous element.

The pulling out (or down) of an illuminated fire handle in a typical large jet aircraft fire protection system commonly accomplishes what events?

Closes all firewall shutoff valves, disconnects the generator, and discharges a fire bottle.
Closes fuel shutoff, closes hydraulic shutoff, disconnects the generator field, and arms the fire-extinguishing system.
Closes fuel shutoff, closes hydraulic shutoff, closes the oxygen shutoff, disconnects the generator field, and arms the fire-extinguishing system.

A fire detection system operated on the principle of a buildup of gas pressure within a tube proportional to temperature. Which of the following systems does this statement define?

Kidde continuous-loop system.
Lindberg continuous-element system.
Thermal switch system.

The fire detection system that uses a single wire surrounded by a continuous string of ceramic beads in a tube is the

Fenwal system.
Kidde system.
thermocouple system.

The fire detection system that uses two wires imbedded in a ceramic core within a tube is the

Fenwal system.
Lindberg system.
Kidde system.

A fuel or oil fire is defined as a

Class B fire.
Class A fire.
Class C fire.

A fire detection system that operates on the rate-of-temperature rise is a

continuous-loop system.
thermocouple system.
thermal switch system.

A fire involving energized electrical equipment is defined as a

Class B fire.
Class D fire.
Class C fire.

Two continuous-loop fire detection systems that will not last due to a broken detector element are the

Kidde system and the Lindberg system.
Kidde system and the Fenwal system.
thermocouple system and the Lindberg system.

Which statement best describes the blowout type indicator disk on a fixed fire extinguishing system?

When the red indicator disk is missing, it indicates the fire extinguishing system is charged and ready for use.
When the yellow indicator disk is missing, it indicates the fire extinguishing system has been normally discharged.
When the green indicator disk is missing, it indicates that the fire extinguishing system may have been normally discharged.

The most satisfactory extinguishing agent for an electrical fire is

carbon tetrachloride.
carbon dioxide.
methyl bromide.

Which of the following fire detection systems will detect a fire when an element is inoperative but will not test when the test circuit is energized?

The Kidde system and the thermocouple system.
The Kidde system and the Fenwal system.
The thermocouple system and the Lindberg system.

Which of the following fire detection systems uses heat in the normal testing of the system?

The thermocouple system and the Lindberg system.
The Kidde system and the Fenwal system.
The thermocouple system and the Fenwal system.

After a fire is extinguished, or overheat condition removed in aircraft equipped with a Systron-Donner fir detector, the detection system

must be manually reset.
automatically resets.
sensing component must be replaced.

The use of water on Class D fires

is most effective if sprayed in a fine mist.
will cause the fire to burn more violently and can cause explosions.
has no effect.

For fire detection and extinguishing purposes, aircraft powerplant areas are divided into fire zones based on

hot and cold sections of the engine.
the volume and smoothness of the airflow through engine compartments.
engine type and size.

Refer to Figure 3. What are the fire-extinguisher container pressure limits when the temperature is 50 degrees F?

425 – 575 psig.
435 – 605 psig.
475 – 625 psig.

PP Engine Fire Protection Systems

Jon K

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