This is an old revision of the document!
TLB - Technical Log Book is a section where you can add exact TOFF & LNDG times along with the number of cycles done by particular aircraft in the trip.
The data inserted here can be used for TAH (Total Aircraft Hours) & TAC (Total Aircraft Cycles) calculations (if a checkbox 'Calculate TAH, TAC using TLB' is marked in Admin > Operator Settings. The calculation is then displayed in Admin > Fleet.