The phrase "a favourable part" is correct and usable in written English.
It can be used when referring to a section or aspect of something that is advantageous or beneficial.
Example: "In the negotiation, we focused on a favourable part of the agreement that would benefit both parties."
Alternatives: "a beneficial aspect" or "an advantageous section".
Plentiful streams and lakes, adequate rainfall, and abundant game and fish made this area the most favourable part of the plateau between the Rockies and the Pacific Coast Ranges.
Compared with conventional spinning processes, this in-process heat treatment permits the extension of existing forming limits and allows more complex geometries to be achieved, together with defined, favourable part properties.
At a few places near the tree line, notably in the Canadian western Arctic, the frost-free period may be the same as the less favourable parts of the prairies.
Thus, IL-13 protects from atherosclerosis and promotes a favourable plaque morphology, in part through the induction of alternatively activated macrophages.
Its market has swollen more than fourfold since the 70s thanks in large part to a favourable tax situation.
The exceptional growth in the year just ended, based in part on a favourable monsoon, followed four years of near-drought which has hit rural voters, still the great majority, hard.
An example of this fiercely protective attitude to his work came in 1994 when, as part of a favourable introduction to a catalogue of Long's exhibition at the São Paulo Biennial in 1994, critic David Sylvester compared Long's work with that of "pre-Dynastic Egyptian vessels", "the English surrealists such as Paul Nash and Henry Moore", as well as Caspar David Friedrich and Jasper Johns.
Again, the model relies on sourcing the right parts at a favourable cost.
Gareth McLean, who reviewed a preview screening for The Guardians TV and radio weblog, appreciated the episode's use of "the disaster movie template" and came to a favourable overall conclusion: "For the most part, The Voyage of the Damned is absolutely smashing".
The decision to develop a cross government obesity strategy was in part attributed to a favourable political climate.
