Buffer air assembly for an aircraft engine

An engine for an aircraft, the engine comprising:

• a low-pressure compressor;
• a high-pressure compressor;
• and
• a buffer air assembly including:
• a low-pressure header connected to at least one low-pressure bearing compartment and the low-pressure compressor, and the low-pressure header is configured to receive a low-pressure buffering air from the low-pressure compressor;
• a high-pressure header connected to at least one high-pressure bearing compartment and the high-pressure compressor, and the high-pressure header is configured to receive a high-pressure buffering air from the high-pressure compressor;
• and
• an electric buffer compressor connected to the low-pressure header and the high-pressure header, and the electric buffer compressor is configured to direct pressurized buffering air to the low-pressure header and the high-pressure header.

A buffer air assembly for an aircraft engine, the buffer air assembly comprising:

• a low-pressure header connected to at least one low-pressure bearing compartment;
• a high-pressure header connected to at least one high-pressure bearing compartment;
• a supply header interconnecting the low-pressure header and the high-pressure header;
• a low-pressure bleed air source connected to the low-pressure header, and the low-pressure bleed air source is configured to direct a low-pressure buffering air to the at least one low-pressure bearing compartment through the low-pressure header;
• a high-pressure bleed air source connected to the supply header, and the high-pressure bleed air source is configured to direct a high-pressure buffering air to the at least one low-pressure bearing compartment and the at least one high-pressure bearing compartment;
• an electric buffer compressor connected to the supply header, and the electric buffer compressor is configured to direct pressurized buffering air to the at least one low-pressure bearing compartment and the at least one high-pressure bearing compartment;
• and
• a buffer switching valve disposed between the supply header and the low-pressure header, the buffer switching valve is positionable in a first position and a second position, the buffer switching valve connects the supply header to the low-pressure header in the first position, and the buffer switching valve connects the low-pressure bleed air source to the low-pressure header in the second position.