X
XRAY
See Radiography Inspection. Equivalent Terms: Radiography

Z
Zero Flight Time Training (ZFTT)
A flight crew qualification concept whereby:
• flight training and evaluation is conducted solely in advanced simulation devices without the need for flight time in an aircraft;
• a final demonstration of competency is completed in an aircraft during actual line operations under the supervision of an instructor, evaluator or current and qualified Pilot-in-Command (PIC) designated for the purpose by the Operator and/or State..
Zonal Inspection
Visual inspections or checks in specified aircraft zones and areas for security and general condition of installations, components and structure. The zone has to be inspected as far as visible according to the required access opening. Some tasks have been selected for areas sensitive to potential corrosion and to damages not connected with the design (e.g. FOD).