EXPLANATION OF CHANGE SYMBOLS

TM 1-1520-238-10 1-2 Change 9 1.10 EXPLANATION OF CHANGE SYMBOLS. Changes to the text and tables, including new material on added pages, shall be identified by a vertical bar in the outer margin of the column of text in which the change ap- pears, extending close to the entire area of the material affected. Change symbols for single column text shall be placed in the margin opposite the binding. Change sym- bols for double column text shall be placed in the margin adjacent to the binding for the columns of text nearest the binding. The change symbols shall be placed in the outer margin opposite the binding for the column of text farthest from the binding. Pages with emergency markings, which consist of black diagonal lines around three edges, shall have the vertical bar or change symbol placed in the mar- gin between the text and the diagonal lines. Change sym- bols shall indicate the current changes only. A miniature pointing hand symbol shall be used to denote a change to an illustration. However, a vertical line in the outer margin (opposite the binding) rather than miniature pointing hands, shall be utilized when there have been extensive changes made to an illustration. Change symbols shall not be used to indicate changes in the following: a. Introductory material. b. Indexes and tabular data where the change cannot be identified. c. Correction of minor inaccuracies, such as spelling, punctuation, relocation of material, etc., unless such correction changes the meaning of the instructive infor- mation and procedures. 1.11 SERIES AND EFFECTIVITY CODES All AH-64A helicopters have BUCS equipment installed. In most helicopters, the system is deactivated; in some it is operable. The designator symbol indicates text headings, text contents and illustrations pertaining to heli- copters with an operable BUCS. Some AH-64A helicopters have T700-GE-701C engines installed. Those helicopters will have components, instru- mentation, performance parameters, and procedures dif- ferent from helicopters with T700-GE-701 engines installed. The designator symbols and indicate material pertaining to those specific engines. Some AH-64A helicopters have the 7-319200005-11 Fire Control Computer (FCC) with –51 software installed (EGI Mod); others have the 7-319200005-9A Fire Control Com- puter (FCC) with –49A software installed; others yet have the 7-319200005-5 FCC with –45 software. Because of differences in operation, displays, etc. designator symbols , , and will indicate material peculiar to that software installation. 1.12 USE OF SHALL, SHOULD, AND MAY. Within this technical manual, the word shall is used to in- dicate a mandatory requirement. The word should is used to indicate non-mandatory but preferred method of accomplishment. The word may is used to indicate an ac- ceptable method of accomplishment. 1.13 PLACARD ITEMS All Placard Items (switches, controls, etc.) are shown throughout this manual in BOLD FACE capital letters.