Originally Posted by
70 Mustang
I’ve flown most models of the 737 in 6 different airlines in 4 different countries and never once have I ever seen “cleared to pressurize”
It's been standard procedure on all the Boeings I've been involved with since the early 1980s.
Main reason, to ensure we don't pressurise the steering system with a tow bar attached and no lock out pin fitted. As explained above, other reasons exist too.