VOR Allows pilot or copilot to select VOR on his No. 2 bearing pointer, each independent of the other.
CIS mode Selects one of three modes of
selector operation to direct navigational signals to the CISP for Command Signal display.
HDG ON Direct heading and roll signals to CIS processor for steering commands that will allow pilot to maintain a selected heading.
NAV ON Gives heading commands to acquire and track a selected VOR, ILS,TACAN, DPLR/GPS, or FM intercept, or to acquire and track glide slope beam.
ALT ON Directs barometric pressure signals and collective stick position signals to CIS processor.
INSTRUMENT PANEL
VTAC Allows pilot or copilot to select either VOR information or TACAN
for display on individual HSI.
BRG 1/ DIST Selects either long range navigation (DPLR/GPS), or TACAN for display on both HSIs.
3.19.4.2 Off Mode. The command instrument system off mode (no switch legends lit) causes the cyclic roll, cyclic pitch and collective command pointers on both vertical situation indicators to be stowed out of view and the com-mand warning .ag on both VSIs to be biased out of view. The CISP is in the off mode upon initial application of electrical power, before the pilot selects either HDG, NAV or ALT mode on the CIS mode selector. When NAV mode is selected, the CISP remains in the off mode unless the DOP/GPS, VTAC ILS or FM HOME navigation data has been selected on the pilot’s VSI/HSI mode selector. The CISP will return to the off mode whenever the HDG, NAV, and ALT hold modes are disengaged, as indicated by the respective ON legends going off, or by turning off the as-sociated navigation receiver. Separate modes are manually disengaged by pressing the mode switch when ON is lit.
3.19.4.3 Heading Mode. The heading mode processes the heading error and roll attitude signals to supply a lim-ited cyclic roll command, which, when followed, causes the helicopter to acquire and track the heading manually se-lected on either pilot’s HSI. The processed signal causes the VSI cyclic roll command bar to de.ect in the direction of the required control response; i.e., bar de.ection to the right indicates a coordinated right turn is required. When properly followed, the command results in not more than one overshoot in acquiring the selected heading and a tracking error of not more than 2°. The processor gain pro-vides 1° of roll command for each degree of heading error up to a roll command limit of approximately 20°. The CISP heading mode is engaged by momentarily pressing the HDG switch on the pilot’s CIS mode selector, or as de-scribed in paragraph 3.19.4.5.
3.19.4.4 Altitude Hold Mode. The altitude hold mode processes barometric pressure signals from the air data transducer in addition to the collective stick position signal. When the ALT switch on the pilot’s CIS mode selector is pressed, the CISP provides collective command signals, which, when properly followed, cause the helicopter to maintain altitude to within plus or minus 50 feet. The alti-tude hold mode synchronizes on the engagement altitude for vertical rates up to 200 feet per minute and provides performance for altitude inputs between -1000 and +10,000 feet at airspeeds from 70 to 150 KIAS. It is possible to engage the altitude hold mode, regardless of whether the heading mode or navigation mode is engaged, except that the CISP logic prevents manual selection of the altitude hold mode whenever the NAV mode is engaged and an ILS frequency is selected. This prevents the operator from se-lecting altitude hold mode during an instrument approach. The altitude hold mode is manually engaged by pressing the ALT hold switch (subject to above restriction) or auto-matically engaged as described in paragraph 3.19.4.7. The altitude hold mode may be manually disengaged by press-ing the ALT hold switch when the ON legend is lit. Alti-tude hold may be disengaged also by selecting any other mode which takes priority (e.g., Go Around).
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