TM 55-1520-240-T-26. Before starting, read the entire task. Familiarize yourself with the entire procedure before beginning thetask,7. As you read, pay attention to WARNINGS, CAUTIONS, and N O T E S.8. When the word INSPECT is in your procedures, an inspector must ok the completed step(s).9. Major steps and key words are printed in boldface for experienced repairers.10. A glossary is on page 1-87. It lists the abbreviations, special words and terms used in this manual andgives their meaning.11. When a special tool is used or a common tool is used in an unusual way, the use of the tool will beshown.12. When a block states, “Repair or replace wire as required.”, refer to TM 55-1500-323-24 for recommend-ed maintenance practices.13. Voltages specified in blocks are nominal values unless a range is given. These nominal values and theiracceptable ranges are as follows:Nominal voltageRange28 VDC24 to 3026 VAC24 to 2824 VDC (Battery)20 to 245 VAC4 to 6115 VAC110 to 12014 In the event of the necessity to add or replace electrical wiring, the colors of wire received from supplymay not be the same as the original wire colors. Use wire numbers only for identification of wires. Tag oridentify wires by proper number when disconnecting or replacing.AIRCRAFT MODIFICATION (ECP/MWO) RETROFIT INFORMATIONThroughout this manual, black squares containing white numerals are used to distinguish information relating tohelicopters modified by an MWO or ECP. Refer to Helicopter Configuration Legend on the following pages forspecific modification and effectivities relating to each numeral. A list of delivered helicopters serial numbers is included with the legend.Information pertaining only to unmodified helicopters is identified by the appropriate effectivity symbol preced-ed by WITHOUT. For example, WITHOUT indicates that the information that follows is applicable only to helicopters not modified by ECP DO 18. Information pertaining only to helicopters that have been modified byECP DO 18 is preceded by WITH . All information not preceded by an effectivity symbol is common to allhelicopters.The following helicopter Designation Legend pages are solely for user convenience. They have no officialstatus.DELIVERED HELICOPTER SERIAL NUMBERS8 1 - 2 3 3 828 2 - 2 3 7 628 3 - 2 4 1 0284-24152throughthroughthroughthrough8 1 - 2 3 3 898 2 - 2 3 7 808 3 - 2 4 1 2584-2418785-24322through85-24336GO TO NEXT PAGEviChange 6
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