Chapter 1 24 Hour Clock


On a 24 hour clock, Midnight starts the day at 0000. It is very important to memorize and utilize the 24 hour clock in corporate aviation. All times on your trip sheet will be in 24 hour clock as well as all of your catering time communications.


1 AM 0100 2 AM 0200 3 AM 0300 4 AM 0400 5 AM 0500 6 AM 0600 7 AM 0700 8 AM 0800 9 AM 0900 10 AM 1000 11 AM 1100


(noon) 12 PM 1200 1 PM 1300 (add 12 to 1 PM = 13 / 1300) 2 PM 1400 3 PM 1500 4 PM 1600 5 PM 1700 6 PM 1800 7 PM 1900 8 PM 2000 9 PM 2100 10 PM 2200 11 PM 2300


By designating the clock’s hour points from 0 - 24 instead of 1 - 12, we easily establish the 24 hour clock. Actually, the hour points are used twice on the 24 hour clock. The first time around the clock for A.M. hours, the second time around for P.M. hours. The 24 hour clock uses four digits to state the time.


The first two digits state the hour, the last two express the minutes. Thus 5:00 AM becomes 0500 (expressed verbally: “Oh - Five - Hundred - Hours”). 5:15 AM becomes 0515.


Here are some further examples: 10:00 AM becomes 1000 Noon becomes, 1200 Midnight becomes 2400


5:00 PM becomes 1700 9:00 PM becomes 2100


A simple crutch for converting to the 24 hour clock for the PM hours is to add the hour to twelve, thus 5:00 PM added to 12 equals 1700 (5 + 12 = 17).


After awhile, the use of the 24 hour clock becomes completely natural. 8 © Aircare FACTS - Initial Service Training


What Is A Corporate Flight Attendant?


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