2024-20519. Special Conditions: Aerocon Engineering Company, Airbus Model A350-941 Airplane; Forward Lower Lobe Crew Rest Compartment Installation

Fire protection features	Stowage compartment interior volumes
	less than 25 ft3	25 ft3 to 57 ft3	57 ft3 to 200 ft3
Materials of Construction 1	Yes	Yes	Yes
Detectors 2	No	Yes	Yes
Liner 3	No	No	Yes
Locating Device 4	No	Yes	Yes
1   Material: The material used to construct each enclosed stowage compartment must at least be fire resistant and must meet the flammability standards established for interior components per the requirements of § 25.853. For compartments less than 25 ft3 in interior volume, the design must ensure the ability to contain a fire likely to occur within the compartment under normal use.
2   Detectors: Enclosed stowage compartments equal to or exceeding 25 ft3 in interior volume must be provided with a smoke or fire detection system to ensure that a fire can be detected within a one-minute detection time. Flight tests must be conducted to show compliance with this requirement. Each system (or systems) must provide:
(a) A visual indication in the flight deck within one minute after the start of a fire;
(b) An aural warning in the crew rest compartment; and
(c) A warning in the main passenger cabin. This warning must be readily detectable by a flight attendant, taking into consideration the positioning of flight attendants throughout the main passenger compartment during various phases of flight.
3   Liner: If it can be shown that the material used to construct the stowage compartment meets the flammability requirements of a liner for a Class B cargo compartment, then no liner would be required for enclosed stowage compartments equal to or greater than 25 ft3 in interior volume but less than 57 ft3 in interior volume. For all enclosed stowage compartments equal to or greater than 57 ft3 in interior volume but less than or equal to 200 ft3 , a liner must be provided that meets the requirements of § 25.855 at Amendment 25-60 for a class B cargo compartment.
4   Location Detector: Crew rest areas which contain enclosed stowage compartments exceeding 25 ft3 interior volume and which are located away from one central location such as the entry to the crew rest area or a common area within the crew rest area would require additional fire protection features and/or devices to assist the firefighter in determining the location of a fire.