| CPC E21B 33/038 (2013.01) [E21B 33/043 (2013.01); E21B 41/04 (2013.01)] | 20 Claims |

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1. A system comprising a blowout preventer (BOP) or a running system and for use with a subsea well or completion installation, the system comprising:
a non-oriented tubing hanger adapter bushing (THAB) associated with a sleeve and a full-bore tubing head spool (FBTHS) of the subsea well or completion installation; and
an externally activated key of the FBTHS to engage with a helical groove associated with the sleeve and with the non-oriented THAB to enable self-orientation of a tubing hanger independent of an external orientation application performable in part using the BOP or the running system.
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