Aircraft Press. Cycles Count
I understand what a pressurized aircraft cycle is, even though I only fly spam cans. But how are the cycles actually counted? Is it counted by a piece of equipment inside the aircraft or only tallied by paperwork/records on the ground?
I suspect modern FMS aircraft may have the number available somewhere inside the electronics, but what about older 727 and pre-FMS? How dos one guard against shady operators under-counting cycles/hours? In piston/unpressurized A/C there's a tachometer driven clock and/or Hobbs meter to count hours of engine operation. This number is recorded and can be tracked through the maintenance records. Thanks for a reply.