Uh-60 Navigation and Command Instrument System

Overview: CIS components and locations Heading Mode Altitude Hold Mode Go-Around Mode Navigation Modes Doppler VOR (Level OFF Mode) ILS (Approach Mode) Back Course FM Home

HSI

COMMAND INSTRUMENT SYSTEM COCKPIT COMPONENTS VERTICAL SITUATION INDICATOR CIS MODE SELECTOR VSI / HIS MODE SELECTOR HORIZONTAL SITUATION INDICATOR

Navigation and Command Signals:

(f) Pitch command bar: 1. ILS /ILS BACK CRS 2. GO-AROUND (g) Collective position indicator: 2. ALT HOLD 3. LEVEL OFF 4. GO-AROUND

Manual Heading Operation When followed, tracking error of no more than 2 deg. 1 deg of roll cmd for each deg of HDG error up to approx. 20 deg.

Altitude Hold Operation

Go Around Function

ILS Navigation (outside the capture zone)

ILS Navigation (inside the capture zone)

Back Course Approach

COMMAND INSTRUMENT SYSTEM FM HOME MODE The FM homing is engaged by selecting the FM HOME and NAV, Signals will be sent to the VSI only, and other NAV modes will be retained if previously selected. The homing will be to stations tuned on the #1 VHF radio, and when followed result in not more than 2 overshoots, and a track error of not more than 3 deg. FM HOME NAV ON

Vertical Situation Indicator (VSI) There are two (2) VSI’s installed in the UH-60A aircraft. They are identical instruments, mounted on the pilot’s instrument panels. They display identical course relation information.

Vertical Situation Indicator V.S.I Components (1) Roll command bar: Provides processed roll commands to the desired heading or course in the HDG or NAV modes

Vertical Situation Indicator (2) Pitch command bar: Provides processed pitch commands to maintain airspeed in the ILS NAV mode and the GA mode (3) Collective position indicator: Provides processed collective position indications relative to where the collective should be to maintain desired altitude, climb or decent

Vertical Situation Indicator (4) Go-around Advisory Light: The GA light will illuminate whenever the GA switch on the pilot or copilot’s cyclic stick is pressed 500 FPM Climb 80 Knots Wings Level

Vertical Situation Indicator (5) Turn the light off by engaging another mode on the CIS Mode Select Panel

Vertical Situation Indicator (5) Decision height advisory light: The DH light will illuminate whenever the radar altimeter is operating and the altitude is at or below the radar altitude L (low bug) setting The DH light illuminates for the pilot and copilot independently based on their individual radar altimeter setting

Vertical Situation Indicator (6) Marker beacon advisory light: The MB light will illuminate when the aircraft is over the marker beacon transmitter (7) Sphere (8) Pitch Trim Knob (9) Roll Trim Knob

Vertical Situation Indicator (10) Glide slope deviation pointer: The pointer represents the glide slope position with respect to the helicopter (11) Course deviation pointer: The pointer represents the position of the course selected on the HSI with respect to the helicopter

Vertical Situation Indicator (12) Inclinometer (13) Turn Rate Indicator (14) Warning Flags (a) Command warning flag (Processed Data) (b) Glide slope warning flag (G.S. Pos Indicator) (c) Navigation warning flag (C.D. Pointer) (d) Attitude warning flag (Attitude Indicator)

Horizontal Situation Indicator (HSI) There are two (2) HSI’s installed in the UH-60A aircraft They are identical instruments mounted on the pilot and copilot’s instrument panels They display identical course relation information

Horizontal Situation Indicator (HSI) H.S.I. Components (1) Doppler Distance to Go Display: Displays digital distance in kilometers to the destination set on the Doppler/GPS fly to destination (2) Distance Shutter

Horizontal Situation Indicator (HSI) (3) Course Set Display (4) Course Set Pointer (5) Course Set Knob (6) Course Deviation Bar: Each dot represents - 1.25 degrees for ILS 5 degrees for VOR

Horizontal Situation Indicator (HSI) (7) To/From Arrow (8) Heading Warning Flag (Heading) (9) Navigation Warning Flag (C.D. Bar) (10) Heading Select Marker: Used to select the desired heading for use by the CISP

Horizontal Situation Indicator (HSI) (11) Heading Set Knob (12) No. 1 Bearing Pointer (13) No. 2 Bearing Pointer

HSI/VSI Mode Selection Panels There are two HSI/VSI mode select panels installed in the UH-60 aircraft They are identical panels and are mounted on the pilot and copilot’s instrument panels

HSI/VSI Mode Selection Panels Identical information will be displayed on the CRS/HDG Switch at all times All other switches may have different displays on each panel

Rule of 5 RULE #1 = #1 Bearing Pointer (1) Doppler/GPS

Rule of 5 RULE #2 = #2 Bearing Pointer (1) VOR (2) ADF

Rule of 5 RULE #3 = Course Deviation Bar (HSI) (1) Doppler/GPS (2) VOR (3) Localizer

Rule of 5 RULE #4 = Course Deviation Pointer (VSI) (1) Doppler/GPS (2) VOR (3) Localizer (4) FM home

Rule of 5 RULE #5 = Roll Command Bar (VSI) (1) Doppler (2) VOR (3) Localizer (4) FM home (5) Heading

Switch Selection (1) Pilot’s Mode Select Panel selects pilot’s instruments and CISP (2) Copilot’s Mode Select Panel selects copilot’s instruments (3) Course selector is switchable to either instrument (4) VOR indications referenced to course in selected instrument

Switch Selection (5) Upper legend is for top row of switch (6) Lower legend is for bottom row of switches (7) Switch characteristics: (a) Push button (b) On when lit (c) NAV signals must be available or NAV switch has no effect

HSI/VSI Mode Select Panel (1) Bearing No. 2 switch (2) Vertical gyro switch (3) Course/heading switch (4) Turn rate switch (5) FM home switch (6) Back course switch (7) VOR/ILS switch (8) Doppler switch

Description/Operation of HSI/VSI Mode Select Panel Switches

BRG 2 (1) BRG 2 Switch operation (a) BRG 2 select switch selects source of signal to the associated HSI No. 2 needle (b) ADF automatically on when power is initially applied (c) Pressing switch alternates between ADF and VOR NOTE: The HSI No. 1 bearing pointer is always coupled to the Doppler navigation set and has no switch

VERT GYRO (a) VERT GYRO selects vertical gyros for driving attitude indications and attitude warning flag signal 1. NORM automatically on in both panels when power is initially applied 2. Pressing switch alternates between NORM and ALTR

VERT GYRO (cont) (b) Pilot’s selector panel 1. NORM – attitude signals to pilot’s VSI are from right (No. 2) gyro 2. ALTR – attitude signals to pilot’s indicator are from left (No. 1) gyro (c) Copilot’s selector panel 1. NORM – attitude signals to copilot’s VSI are from left (No. 1) gyro 2. ALTR - attitude signals to copilot’s VSI are from right (No. 2) gyro NOTE: May use any combination since either gyro is capable of driving both instruments

CRS/HDG (a) Selects which HSI that will supply- 1. Selected course information to the VHF navigation receiver (VOR) 2. Course error to command instrument system (VOR or ILS or Doppler/GPS) 3. Heading error to command instrument system

CRS/HDG (cont) (b) Pilot and copilot’s selector panels always indicate same position 1. PLT on (both panels) when power initially applied and information is from pilot’s HIS 2. “Take Only” Switch

TURN RATE (a) Both panels automatically on NORM when aircraft power is applied (b) Pressing switch alternates between NORM and ALTR (c) Pilot’s panel 1. NORM – Turn rate signals from right gyro 2. ALTR – Turn rate signals from left gyro (d) Copilot’s panel 1. NORM – Turn rate from left gyro 2. ALTR – Turn rate signals from right gyro

FM HOME (a) FM home – couples FM homing signals from FM No. 1 to NAV systems. 1. FM No. 1 (ARC-114) must be on and in home function 2. ILS mode select light must be out (b) Press FM Home Switch: Light will come on and signals will be applied to 1. VSI deviation pointer 2. VSI navigation flag

FM HOME(cont) (c) Engaging FM home on pilot’s mode select panel applied FM homing signals to CISP (d) Engaging of DPLR or VOR mode select switch with FM home engaged disengages FM home

FM HOME (cont) (e) DPLR or VOR mode engaged, FM home may be engaged 1. FM home will not engage with ILS on 2. DPLR or VOR On and FM Home On: FM home information to Course Deviation Pointer only NOTE: Anytime FM home is engaged with either DPLR or VOR, the system is divided into two parts. FM home signals only displayed on VSI’s. DPLR or VOR, which ever engaged, will be displayed on HSI’s.

BACK CRS (a) ILS must be lit, otherwise this switch has no effect (b) When BACK CRS is lit, the localizer course signals are reversed by the CISP (c) The desired inbound course must be set on the selected HSI CRS window

VOR/ILS (a) VOR/ILS when lit couples the ARN-123 VHF navigation unit to the navigation system 1. Automatically disengages other selected navigation inputs (DPLR, FM Home) 2. VOR illuminates if VOR frequency tuned 3. ILS illuminates if ILS frequency tuned.

VOR/ILS (cont) (b) CISP 1. Copilot’s panel has no effect on CISP a. VOR on, and FM home on FM signals to CISP b. VOR on, and FM home off VOR signals to CISP c. ILS on. FM home will not engage ILS signals to CISP NOTE: When ILS is selected and NAV is selected in conjunction with it, whatever airspeed the pilot has is now coupled to pitch command bar. To reset A/S, disengage navigation, adjust A/S, and reengage navigation. A/S hold is limited to 70 to 130 knots

DPLR/GPS (a) DPLR/GPS couples ANS-128 doppler/gps course and distance information to navigation system (b) Engaging DPLR/GPS automatically disengages: 1. VOR 2. ILS 3. Back course 4. FM home

DPLR/GPS (cont) (c) CISP 1. Copilot’s panel has no effect on CISP 2. Pilots’ panel DPLR on, FM home off, DPLR signals to CISP 3. Pilots’ panel DPLR on FM Home, FM Home signals to CISP

ENABLING LEARNING OBJECTIVE (ELO) #4 ACTION: Identify the operational characteristics of the CIS mode select system. CONDITION: Without references. STANDARD: IAW TM 1-1520-237-10

CIS Mode Selector a. There is only one CIS mode selector installed in the UH-60 aircraft The selector is located on the pilot’s instrument panel

CIS Mode Selector (cont) b. Description of CIS and CIS Mode Selector: The CIS processes navigational data, aircraft attitude, and airspeed information appropriate for mode selected to provide visual command indications for roll, pitch, and/or collective control, as needed, to maintain heading, altitude, and to navigate during enroute and approach operations.

CIS Mode Selector (cont) (1) Selects one of three modes of operation to direct navigational signals to the CISP: (a) HDG ON (b) NAV ON (c) ALT ON

CIS Mode Selector - HDG ON Directs heading and roll signals to CIS processor for steering commands that will allow pilot to maintain a selected heading

CIS Mode Selector - NAV ON Gives heading commands to acquire and track a selected VOR, ILS, DPLR, or FM intercept, or to acquire and track glide slope beam

CIS Mode Selector - ALT ON Directs barometric pressure signals and collective stick position signals to CIS processor

Operation of the CIS Mode Selection Panel (1) Switch characteristics: (a) Push button (b) NAV signals must be present for the NAV switch to operate

Heading Switch (a) Couples heading select marker to roll command bar. (b) Commands direction to turn 1. Follow the roll command bar with cyclic (c) Assist in maintaining turn 1. One degree of roll command for each degree of heading error 2. Maximum roll command – 20 degrees

Heading Switch (cont) (d) Command wings level on selected heading 1. No more than one overshoot in acquiring the selected heading 2. Tracking error of no more than 2 degrees (e) Switches off automatically within 10 degrees of selected course (VOR) and 2.5 degrees localizer (ILS)

Altitude Switch (1) Couples barometric or radar altimeter to collective position indicator depending on submode (2) Senses the altitude at time of engagement (3) Synchronizes on engagement altitude for vertical rates up to two hundred (200) feet per minute

Altitude Switch (cont) (4) Performance altitude inputs between –1,000 and +10,000 feet at airspeeds from 70 to 150 KIAS (5) Commands direction of movement of collective to return aircraft to originally selected altitude (6) Commands collective movement to maintain absolute altitude selected on radar altimeter when in level off submode

Altitude Switch (cont) (5) Switches off automatically when glide slope is intercepted during ILS approach (a) Cannot be selected with ILS frequency used in NAV engaged (b) For manual engagement with ILS frequency and NAV engaged, turn NAV off, reengage NAV

NAV Switch (1) Couples the selected navigation system on the pilots side (pilots course deviation pointer) to roll command bar (2) During ILS, couples pitch command bar to airspeed indicator (3) Displays aircraft turns necessary to track navigation signal

NAV Switch (cont) (4) Commands 45-degree intercept of selected course (HSI course window) when: (a) Heading Mode not selected (b) Within ten (10) degrees of selected VOR course (HSI course window) (c) Within 2.5 degrees of LOC centerline (5) Causes heading mode to drop out automatically when within capture zone

NAV Switch (cont) (6) Causes altitude mode to drop out automatically when glide slope is intercepted during ILS approach (7) During Go-Around Submode, couples roll command bar to wings level, pitch command bar to 80 knots airspeed, and collective position indicator to 500 Feet Per Minute (FPM) climb

PRACTICAL EXERCISE 1. What are the turn rate and vertical gyro buttons on the mode select panel used for?

PRACTICAL EXERCISE 2. Why is the CRS/HDG button on the mode select panel referred to as a “take only” button?

PRACTICAL EXERCISE 3. What is the BRG 2 button on the mode select panel used for and what information does it display? HINT: Rule #2

PRACTICAL EXERCISE 4. What indicator does Rule #1 of the Rule of 5 pertain to and what information does it display?

PRACTICAL EXERCISE 5. What indicator does Rule 2 of the Rule of 5 pertain to and what information does it display?

PRACTICAL EXERCISE 6. What indicator does Rule 3 of the Rule of 5 pertain to and what information does it display?

PRACTICAL EXERCISE 7. What indicator does Rule 4 of the Rule of 5 pertain to and what information does it display?

PRACTICAL EXERCISE 8. What indicator does Rule 5 of the Rule of 5 pertain to and what information does it display?

PRACTICAL EXERCISE 9. To complete a back course localizer using the CISP, what must the pilot have lit on the mode select panel? What must be set in the HSI CRS window?

PRACTICAL EXERCISE 10. ALT on directs ______________ signals and collective stick position signals to the CISP.

PRACTICAL EXERCISE 11. When within_________ degrees of the VOR course centerline set in the ______________ HDG mode will turn off automatically if _____________ is also engaged. The CISP now wants to intercept the VOR course at ____________ degrees.

PRACTICAL EXERCISE 11. What is the maximum effective range of an excuse?