INSTRUMENTS FLIGHT PLANNING
Proposed Departure Time (Z)
Your proposed T/O time converted to ZULU (Greenwich Mean Time). Figure 2-9 displays the
time zones in the United States.
All times written on a DD 175 are in ZULU.
Figure 2-9 Time Zones
The Eastern Time Zone is five hours behind Greenwich and as we proceed west, the differences
increase by one hour. The Pacific Time Zone is eight hours earlier than Greenwich; therefore, to
convert U. S. time zones to (Z) add the appropriate conversion factor to the U. S. time.
During periods of daylight savings time, U. S. clocks are turned
ahead by one hour. The conversion factors are one hour less, i.e.,
EDT = +4, CDT = +5, etc.
2-6 DD 175 FLIGHT PLAN