Which sections of a reciprocating engine installation are always considered designated fire zones?

The engine power section and the engine accessory section of reciprocating engines are designated fire zones (CS 29.1181(a)(1) and (a)(2)).

When is a complete powerplant compartment of a reciprocating engine considered a designated fire zone?

A complete powerplant compartment of a reciprocating engine is a designated fire zone when there is no isolation between the engine power section and the engine accessory section (CS 29.1181(a)(3)).

Is the auxiliary power unit compartment always a designated fire zone?

Yes, any auxiliary power unit compartment is a designated fire zone (CS 29.1181(a)(4)).

Are the combustor, turbine, and tailpipe sections of a turbine engine always designated fire zones?

No, the combustor, turbine, and tailpipe sections of a turbine engine are designated fire zones except for sections that do not contain lines or components carrying flammable fluids or gases and are isolated from the compressor and accessory section fire zone by a firewall meeting CS 29.1191 (CS 29.1181(a)(7)).

What types of installations are explicitly listed as designated fire zones under CS 29.1181?

Designated fire zones include: the engine power section and engine accessory section of reciprocating engines; any complete powerplant compartment of a reciprocating engine without isolation between power and accessory sections; any auxiliary power unit compartment; any fuel-burning heater and other combustion equipment installation described in CS 29.859; the compressor and accessory sections of turbine engines; and the combustor, turbine, and tailpipe sections of turbine engines unless exempted by the isolation and firewall conditions (CS 29.1181(a)).

For a reciprocating engine, if the power section and accessory section are not isolated from each other, what is the classification of the entire compartment?

The entire powerplant compartment is a designated fire zone (CS 29.1181(a)(3)).

Which sections of a turbine engine are always designated fire zones regardless of other conditions?

The compressor and accessory sections of turbine engines are always designated fire zones (CS 29.1181(a)(6)).

CS 29.1181 Designated fire zones: regions included

Q: What condition must be met for the combustor, turbine, and tailpipe sections of a turbine engine to be excluded from being a designated fire zone?

These sections are excluded from being a designated fire zone only if they do not contain lines or components carrying flammable fluids or gases and are isolated from the compressor and accessory section fire zone by a firewall that meets CS 29.1191 (CS 29.1181(a)(7)).

Q: Which regulation describes the fuel-burning heater and other combustion equipment installations that are designated fire zones?

CS 29.859 describes the fuel-burning heater and other combustion equipment installations that are designated fire zones (CS 29.1181(a)(5)).

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CS 29.1181 Designated fire zones: regions included

ED Decision 2003/16/RM

(a) Designated fire zones are:

(1) The engine power section of reciprocating engines;

(2) The engine accessory section of reciprocating engines;

(3) Any complete powerplant compartment in which there is no isolation between the engine power section and the engine accessory section, for reciprocating engines;

(4) Any auxiliary power unit compartment;

(5) Any fuel-burning heater and other combustion equipment installation described in CS 29.859;

(6) The compressor and accessory sections of turbine engines; and

(7) The combustor, turbine, and tailpipe sections of turbine engine installations except sections that do not contain lines and components carrying flammable fluids or gases and are isolated from the designated fire zone prescribed in sub-paragraph (a)(6) by a firewall that meets CS 29.1191.

(b) Each designated fire zone must meet the requirements of CS 29.1183 to 29.1203.

Details

Source-Title: CS 29.1181 Designated fire zones: regions included View latest amendments

Erulesid: ERULES-1963177438-5575 Compare versions

Domain: Initial airworthiness

Amendedby: Initial issue

Applicabilitydate: 14 November, 2003

Entryintoforcedate: 14 November, 2003

Regulatorysource: ED Decision 2003/16/RM Navigate

Regulatorysubject: CS-29

Typeofcontent: CS (Certification specification)

Origin: EASA

Category: EAR