4. Maximum and minimum temperatures in the nacelle
The temperatures in the nacelle or APU compartment in which the extinguishing agent is expected to work should be considered for their effect on the dispersion of the agent.
5. Maximum and minimum operational temperatures of the extinguishing agent (agent soak temperatures)
Minimum operational temperature testing with the typical extinguishing agents cannot be sufficiently simulated with lower pressures in the system because of the presence of multi-phase flow in the system during discharge. These tests should be performed with agent filled containers that have been conditioned at the appropriate temperatures.
6. Type of extinguishing agent
Advisory Circular 20-100, referenced under related material below, contains minimum concentration values sufficient to extinguish turbine engine fires for five different agents (CO2, CH3Br, CH2BrCl, CF2Br2, and CF3Br), except for the carbon dioxide all are chlorofluorocarbons. Environmental concerns have led to worldwide restrictions on the production and use of the chlorofluorocarbons, and work has been ongoing for over a decade to find replacement agents. The use of agents other than those currently in use will require special consideration to validate their efficacy.
Consult with the Small Airplane Directorate in these situations.
7. Type of fuel
The majority of aircraft extinguishing systems have been used on turbine-powered aircraft using turbine fuel. As a result, the agents and their required concentrations have developed around extinguishing fires common to turbine engines and not reciprocating, or exotic engines. Other fuels, such as Avgas, alcohol, bio-diesel, and hydrogen, may require additional work to determine the appropriate concentrations, measurement, and testing techniques to show compliance with § 23.1195.
Related Material
AC 20-100, General Guidelines for Measuring Fire Extinguishing Agent Concentrations in Powerplant Compartments
Paragraph 23.1195(a)
No specific policy is available as of December 31, 2002.
Paragraph 23.1195(b)
No specific policy is available as of December 31, 2002.
23.1197 Fire extinguishing agents (Amendment 23-34)
CAR 3 Cross-reference: None
ADC Cross-reference: None
Paragraph 23.1197(a)
No specific policy is available as of December 31, 2002.
Paragraph 23.1197(b)
No specific policy is available as of December 31, 2002.
23.1199 Extinguishing agent containers (Amendment 23-34)
CAR 3 Cross-reference: None
ADC Cross-reference: None
Paragraph 23.1199(a)
No specific policy is available as of December 31, 2002.
Paragraph 23.1199(b)
No specific policy is available as of December 31, 2002.
Related Material
AC 23.1419-2B, Certification of Part 23 Airplanes for Flight in Icing Conditions
Paragraph 23.1199(c)
No specific policy is available as of December 31, 2002.
Paragraph 23.1199(d)
No specific policy is available as of December 31, 2002.
Paragraph 23.1199(e)
No specific policy is available as of December 31, 2002.
23.1201 Fire extinguishing systems materials (Amendment 23-34)
CAR 3 Cross-reference: None
ADC Cross-reference: None
Paragraph 23.1201(a)
No specific policy is available as of December 31, 2002.
Paragraph 23.1201(b)
No specific policy is available as of December 31, 2002.
23.1203 Fire detector system (Amendment 23-51)
CAR 3 Cross-reference: None
ADC Cross-reference: 5.72
Paragraph 23.1203(a)
ADC Cross-reference: 5.72(a)
No specific policy is available as of December 31, 2002.
Paragraph 23.1203(b)
ADC Cross-reference: 5.72(b)
No specific policy is available as of December 31, 2002.
Paragraph 23.1203(c)
ADC Cross-reference: 5.72(c)
No specific policy is available as of December 31, 2002.
Paragraph 23.1203(d)
ADC Cross-reference: 5.72(d)
No specific policy is available as of December 31, 2002.
Paragraph 23.1203(e)
ADC Cross-reference: 5.72(e)
No specific policy is available as of December 31, 2002.
Related Material
AC 23-2, Flammability Tests