TM 55-1510-219-10 NOTE Values for various spheroids are listed in Table 3-1. 4.    If values are correct, return CDU to normal display mode by momentarily setting data selector to any position except UTM WYPT.  If values are to be changed, continue with following steps: NOTE The  INS  geographic  position,  as read  in  L/L  displays,  will  not  be affected  by  any  changes  in  these coefficients. 5.    Keys   "2"or   "8"   Press   to   indicate following is the flatness coefficient. (Observe INSERT/ADVANCE pushbutton light illuminates.) 6.    Load   earth   flatness   coefficient   by pressing keyboard keys in sequence. (Example:  2  9  4  9  8  =  29498.    Observe  number appears in left display as keys are pressed.) 7.    INSERT/ADVANCE pushbutton Press. (Observe INSERT/ADVANCE pushbutton light goes out.) 8.    Keys   "4"   or   "6"   Press,   to   indicate following     load     is     relative     earth radius. (Observe INSERT/ADVANCE pushbutton light illuminates.) 9.    Load relative earth radius by pressing keyboard keys in sequence. (Example:  8  2  0  6  m  =  8206.    Observe  numbers appear in the right display as keys are pressed.) NOTE Zone symbol is to be ignored. Table 3-1.  Various Values for UTM Grid Coefficients 10.    INSERT/ADVANCE pushbutton Press. (Observe INSERT/ADVANCE pushbutton light extinguishes.) 11.    Data selector UTM POS. (Observe    coordinate    will    reflect    values    of    new spheroid.) (6) Insert present position. (7) Perform abbreviated INS interface test As required: NOTE Assuming a level aircraft, attitude indicators will become level during   alignment   State   "8"   and remain level in all modes until INS is shut down.  Warning indicators for  INS  attitude  signals  from  INS are    valid    while    attitude    sphere display is level. 3-49