Apple iPad Air 1 repair archive in RAR format, about 1.03 MB. The name does not state the document type or logic board number, so the contents may be a schematic, a boardview or both. Material like this helps a technician follow power rails from the PMU, find the charging and backlight circuits, and locate test points while chasing a short or no-power fault. Compare the board markings on the tablet with the files before using measurements or part positions taken from them.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @schematicslaptop. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.