Из того, что можно было по смыслу докумекать: 10:00 Jan 26
CROWN BLOCK: No information was available on board the rig
stating the last MPI inspection of sheaves and
crown block structure. It is therefore recommended to MPI
inspect all accessible sheaves and parts of the crown block
structure according to API RP 8B standards; this to be done by
a third party company.
The following recommendations regarding the derrick apply:
1) The ladder void at monkeyboard and crown block platform to
be protected by a self-closing gate.
2) All ladder back guards to be extended to the hand-railing
of the various platforms in the derrick.
3) The opening between the main crown block platform and the
platform leading to the ladder void to be plated over;
this on both sides of the ladder void. (Opening size is
30 x 80 cm.)
4) The jumper bar of the main sheave cluster aft should be
renewed due to its poor condition.
5) Crack in the jumper bar frame of the fastline sheave on
starboard side should be welded.
Если то же, то я бы назвал фиксаторами блока шкивов | 
The translation workplace 
