ALT hold mode should be manually dis-abled during localizer, localizer backcourse, VOR, and ADF approaches.
3.19.4.5 Navigation Mode. The CISP navigation mode is engaged by pressing the NAV switch on the CIS Mode Selector. This navigation mode causes the CISP to enter the VOR NAV, TACAN NAV, ILS NAV, DOP NAV,or FM HOME mode as selected on the pilot’s VSI/HSI mode se-lector. The CISP provides steering commands based on the course selected on either the pilot’s or copilot’s HSI depen-dent on the mode select CRS HDG selection of PLT or CPLT.
3.19.4.6 VOR NAV Mode. The VOR NAV or TACAN NAV mode is established by selecting the VTAC ILS switch on the VSI/HSI mode selector and pressing the NAV switch on the CIS mode selectorand selecting VOR/ILS switch on the instrument panel. The CISP processes the heading and course signals derived from either the pilot’s or the copilot’s HSI in addition to the lateral deviation and lateral .ag signals applied to the pilot’s VSI. The CISP provides a limited cyclic roll command, which, when fol-lowed, shall cause the helicopter to acquire and track the course setting manually selected on the HSI. Engagement of the VOR NAV or TACAN NAV mode when the heli-copter position is in excess of 10° to 20° from the selected radial will cause the initial course intersection to be made in the heading mode as described in paragraph 3.19.4.3. The CISP logic will light the CIS mode selector HDG switch ON legend during the initial course intersection. When the helicopter is within 10° to 20° of the selected course, the CISP beam sensor will capture the VOR or TACAN lateral beam. The processor logic will turn off the HDG switch ON legend and the .nal course interception, about 45°, acquisition, and tracking will be based on the VOR or TACAN lateral deviation signals. The processor causes the roll command pointer to de.ect in the direction of the required control response. When properly followed, the command will result in not more than one overshoot at a range of 10 NM at a cruise speed of 100 6 10 knots, and not more than two overshoots at ranges between 5 and 40 NM at speeds from 70 to 140 knots. When passing over the VOR or TACAN station, the CISP reverts to a station pas-sage submode and remains in this submode for 30 seconds. Cyclic roll commands during the station passage submode will be obtained from the HSI course datum signal. Out-bound course changes may be implemented by the HSI CRS SET knob during the station passage submode. Course changes to a new radial, or identi.cation of VOR or TACAN intersections may be made before station passage by setting the HSI HDG control to the present heading and actuating the HDG switch. This will disengage the NAV mode and allow the pilot to continue on the original radial in the heading mode. A VOR or TACAN intersection .x or selection of a new radial course may be made without af-fecting the CIS steering commands. Actuating the NAV switch re-engages the VOR NAVor TACAN NAV mode to either continue on the original VOR or TACAN radial or to initiate an intercept to the new selected radial.
3.19.4.7 ILS NAV Mode. The instrument landing sys-tem NAV mode is established by selecting the VTAC/ILS switch on the VSI/HSI mode selector, tuning a localizer frequency on the navigation receiver, and selecting VOR/ ILS on the VTAC switch on the instrument panel and se-lecting the NAV switch on the pilot’s CIS MODE SEL panel. During the ILS NAV mode the CISP processes the following signals in addition to those processed during the VOR NAV mode: 1. The vertical deviation and vertical .ag signals, 2. the indicated airspeed (IAS) and barometric altitude signals, and 3. the collective stick position sensor and helicopter pitch attitude signals. The indicated airspeed and pitch attitude signals are processed to provide a limited cyclic pitch command, which, when properly followed, will result in maintaining an airspeed that should not deviate more than 5 knots from the IAS existing at the time the ILS NAV mode is engaged. The pitch command bar will de.ect in the direction of the required aircraft response, i.e., an upward de.ection of the pitch bar indicates a pitch up is required. The BAR ALT and collective stick position sig-nals are processed to provide a limited collective position indication, which, when properly followed, will cause the helicopter to maintain the altitude existing at the time the ILS NAV mode is engaged. The collective position indica-tor will de.ect in the opposite direction of the required control response, i.e., an upward de.ection of the collective position indicator indicates a descent is required. The CISP will cause the ALT hold switch ON legend to light when-ever the altitude hold mode is engaged. Actuating the ALT hold ON switch will disengage the altitude hold mode. De-sired approach runway course must be set on the CRS win-dow of the HSI selected by the PLT/CPLT indication of the CRS HDG switch. The initial course intersection and the localizer course interception, about 45°, acquisition, and tracking will be done as described for the VOR NAV mode except that not more than one overshoot at a range of 10 NM at 100 6 10 KIAS, and not more than two overshoots at ranges between 5 and 20 NM should occur for airspeeds between 70 and 130 KIAS.
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