TM 1-1520-238-10 3-64.4 Change 8 NOTE Do not attempt airborne or sea start with HARS mode switch in NORM. HARS will assume the aircraft is stationary with switch in this position. 2. Automatic Airborne Start (with GPS). This meth- od assumes an aircraft power interrupt or a de- sired in-flight navigation restart while the aircraft is airborne. This method can be accomplished in either LAND or WATER mode. The EGI will au- tomatically use GPS data to aid in startup. The HARS mode switch is placed to FAST after the heading tape on the video is visible. When the HARS Heading Flag is retracted from the HSI, the HARS mode switch is placed to OPERATE. The DASE may then be engaged. 3. Automatic Sea Start (with GPS). A sea start as- sumes the aircraft is moving relative to the earths’ surface, the squat switch indicates ground, and WATER mode is selected soon af- ter power is applied. The EGI will automatically use INU data to aid in startup. The HARS mode switch is placed to FAST after the heading tape on the video is visible. When the HARS Heading Flag is retracted from the HSI, the HARS mode switch is placed to OPERATE. The DASE may then be engaged. NOTE If the following operations are attempted (it is NOT recommended) Heading entry must be accurate to within 5 degrees of the actual aircraft heading and the speed entry accu- rate to within 2 knots. For Sea starts, when the aircraft departs the moving platform, air- craft inertial speed must be maintained and the DNS RF:OFF switched to ON. If manual- ly entered speed is not within 2 knots of the DNS speed and DNS does not stay out of memory, then the possibility of the INS and HARS rejecting the DNS velocity is high. If this occurs (Velocity vector error), a forced inflight restart is required. 4. Manual Airborne or Sea Start (without GPS or INU). Manual entry of inertial speed and heading is required. When the entries are completed, the heading tape will be displayed and the HARS mode switch is placed to FAST. When the HARS Heading Flag is retracted from the HSI, the HARS mode switch is placed to OPERATE. The DASE may then be engaged. For Sea Starts the pilot, after lift–off, must maintain speed and constant heading with the ship (same as entered speed and heading); move off the ship over wa- ter; then the CPG will toggle the CDU DNS RF switch from OFF to ON. 5. Forced Inflight Restart. Place the HARS mode switch to FAST to power up HARS and DNS. When HARS heading flag is retracted, place HARS mode switch to OPR. HARS and EGI will use DNS velocity to complete alignment. 3.16.7 CDU Displays. The CDU display architecture is organized into page formats. Each page consists of 8 dis- play lines. All lines are 22 characters wide. The bottom line (eighth) is used as a scratchpad for entering or editing data. Individual pages may display navigation data, dis- play failure messages, or indicate selectable functions. The CDU displays are categorized into 8 top level page formats: NAV, TGT, DATA, CODE, FDLS, PGM, WPN, and FLPN. The CDU will automatically revert back to the NAV top level page from the ADMIN page after 30 sec- onds if there are no characters in the scratchpad and no other key presses are made. a. NAV Top Level Page. The NAV top level page (fig 3-25.1) will display the following: M01-0332 PPOS 12S VC 3255 0396 VAR E014.8DEG D47 BRG 324DEG ADMIN DIST 126.8KM TTG 2:15 TKA 000DEG GS 138KPH MEM NAV STAT3 FDLS FLY TO T42 STR W31 Figure 3-25.1. NAV Top Level Page (UTM Format) Line 1. – Displays the legend PPOS followed by the cur- rent PPOS coordinates. PPOS represents the computed present position in either UTM or LAT/LONG coordinates. PPOS changes to UPD when an on–the–move manual PPOS update is initiated.