Regarding section 3.5.8 of the report, Operator's Route Guide, I would suggest two things:
APBSS, as shown, is a two-way route between Black Rock and Blacksod helipads because leg 5, BLKSD -> BKSDB is shown as an outbound leg from Blacksod, and legs 2/6 & 1/7 (BKSDB <-> BKSDA & BKSDA <-> BLKMO) are shown as two-way legs to and from Black Rock.
Also that footnote 16 on the same page, APBSS: The Operator informed the Investigation that APBSS stands for 'Approach Blacksod South' is very much worthy of further scrutiny.