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3.19.4.8 Approach Mode. The approach mode, a sub-mode of the ILS NAV mode, will be automatically en-gaged when the helicopter captures the glide slope. During the approach mode, the CISP processes the vertical devia-tion, GS .ag, and collective stick position signals to pro-vide a limited collective position indicator, which, when properly followed, shall cause the helicopter to acquire and track the glide slope path during an approach to landing. When the glide slope is intercepted, the CISP logic disen-gages the altitude hold mode and causes the ON legend of the ALT hold switch to go off. The CISP will provide a down movement of the collective position indicator to ad-vise the pilot of the transition from altitude hold to glide slope tracking, and to assist in acquiring the glide slope path. The cyclic roll commands are limited to 6 15° during the approach submode. When properly followed, the roll commands will result in the helicopter tracking the local-izer to an approach. The collective position indicator, when properly followed, will result in not more than one over-shoot in acquiring the glidepath and have a glidepath track-ing free of oscillations. The cyclic roll and collective steer-ing performance is applicable for approach airspeed from 130 KIAS down to 50 KIAS.
3.19.4.9 BACK CRS Mode. The back course mode is a submode of the ILS NAV mode and is engaged by concur-rent ILS ON and BACK CRS ON signal from the pilot’s HSI/VSI mode selector. The CISP monitors the localizer lateral deviation signals to provide cyclic roll commands, which, when properly followed, will allow the pilots to complete back course localizer approach in the same man-ner as the front course ILS. The desired .nal approach course should be set on the selected HSI CRS window.
3.19.4.10 Level-Off Mode. The level-off mode will be activated when either the VOR NAV or ILS NAV modes are engaged, and will be deactivated by selection of another mode or when a radar altitude valid signal is not present. The level-off mode is not a function of a VOR or ILS CIS approach. During ILS or VOR approaches, the barometric altimeter must be used to determine arrival at the minimum altitude. Radar altimeter setting shall not be used for level off commands in the VOR NAV/ILS NAV modes because variations in terrain cause erroneous altitude indications. The level-off mode provides the pilots with a selectable low altitude command. This mode is automatically engaged when the radar altitude goes below either the pilot’s or copilot’s radar altimeter low altitude warning bug setting, whichever is at the higher setting. A DH legend on the VSI and a LO light display on the radar altimeter indicator goes on whenever the radar altitude is less than the LO bug setting. The CISP monitors the radar altimeter and the col-lective stick position sensor to provide a collective pointer command, which, when properly followed, will cause the helicopter to maintain an altitude within 10 feet of the low altitude setting for settings below 250 feet, and 20 feet for settings above 250 feet. The CISP causes the ALT switch ON legend to light and the altitude hold mode to be en-gaged.
3.19.4.11 Go-Around Mode. The go-around mode pro-cesses roll and pitch attitude, altitude rate, collective stick position, and airspeed inputs in addition to internally gen-erated airspeed and vertical speed command signals to pro-vide cyclic roll, cyclic pitch and collective position indica-tion. The go-around mode will engage when either pilot presses the GA (Go Around) switch on his cyclic control grip. When the go-around mode is engaged, the CISP im-mediately provides a collective position indication, which, when followed, will result in a 500 6 50 fpm rate-of-climb at zero bank angle. Five seconds after the GA switch is pressed, the CISP will provide cyclic pitch bar commands, which, when followed, will result in an 80-KIAS for the climbout. The go-around mode is disengaged by changing to any other mode on the pilot’s CIS mode selector.
3.19.4.12 Long Range Navigation (LRN) Mode. The LRN navigation mode is engaged by selecting the DPLR/ GPS switch on the VSI/HSI mode selector and the NAV switch on the pilot’s CIS mode selector. During the LRN navigation mode, the CISP processes LRN track angle error and the LRN NAV .ag signals in addition to the roll angle input from the attitude gyro. The CISP provides cyclic roll bar commands, which, when followed, result in a straight line, wind-corrected, .ight over distances greater than 0.1 nm from WPT The course deviation bar and course devia-tion pointer provide a visual display of where the initial course lies in relationship to the helicopter’s position. The initial course is the course the LRN computes from the helicopter’s position to the destination. To achieve a picto-rially correct view of the course, rotate the course knob to the head of the No. 1 needle when the .y to destination is entered. The DPLR/GPS NAV logic detects the condition of station passover, and automatically switches to heading mode. The switch to heading mode will be indicated by the HDG switch ON legend being turned on, and the NAV switch ON legend being turned off. The Doppler/GPS navi-gation mode will not automatically re-engage, but will re-quire manual re-engagement of the NAV switch on the CIS mode selector.
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