I have found the problem:
in the functions.php from the parent-theme change Codeline 82 from
wp_enqueue_style( 'hitchcock_fontawesome', get_stylesheet_directory_uri() . '/fa/css/font-awesome.css' );
to
wp_enqueue_style( 'hitchcock_fontawesome', get_template_directory_uri() . '/fa/css/font-awesome.css' );
and with child-theme font awesome load correctly ??