What’s “Liner/ Liners”?
Liner is the inner sidewall have sufficient fire integrity and separate from the aircraft structure
Liners – The liner must be separate from (but may be attached to) the airplane structure (see fig. 3). Ceiling and sidewall liner panels of ….
According to FAA AC No: 25.857-1:
- liner MUST have sufficient fire integrity – resistance to flame and temperature penetration
- liner MUST be separate from the airplane structure except for points of attachment
- liner does not need to serve as the compartment seal
Indeed, “liner” could be interpret as : Liner is the inner sidewall have sufficient fire integrity and separate from the aircraft structure
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