Figure 2-9 Time Zones

CHAPTER TWO

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.

NOTE

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.

NOTE

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