1. UH-60 COMMAND INSTRUMENT SYSTEM (CIS)
Developed By: Richard Langdon, (UH-60 IP, Contractor)
Pictures And Illustrations From STUDENT HANDOUT TITLE: UH60 NAVIGATION AND COMMAND INSTRUMENT SYSTEM (CIS)
FILE NUMBER: 53573
JANUARY 2007
United States Army Aviation Center
Fort Rucker, Alabama

2. NOTE The following slides show simulations of the CIS and various flight instruments. The purpose of the simulations are to show how CIS basically functions. These are close approximations only and do not represent exact recreations.

3. FIRST A QUICK REVIEW Vertical Situation Indicator (VSI)
Horizontal Situation Indicator (HSI)
Mode Select Panel

4. VERTICAL SITUATION INDICATOR (VSI)

5. VSI COMPONENTS Go-Around Advisory Decision Height Advisory
Marker Beacon Advisory
Miniature Airplane
Collective Position Indicator
Roll Command Bar
Pitch Command Bar
Sphere (Attitude Indicator)
Glide Slope Indicator
Bank Angle Scale and Index
Inclinometer (Trim Ball)
Turn Indicator
Roll Trim Knob
Pitch Trim Knob

6. FAIL FLAGS CISP FAILURE
Indicates loss of vertical gyro power or VSI malfunction
Indicates loss or unreliable signal indication
Indicates loss or unreliable signal indicator

7. Horizontal Situation Indicator
(HSI)

8. HSI COMPONENTS Heading Select Marker Lumber Line Course Set Display
Distance Shutter (KM Only)
Compass Card
#2 Bearing Pointer (VOR or ADF)
#1 Bearing Pointer (Doppler Only)
Course Set Pointer
To / From Flag
Course Set Knob
Heading Set Knob
Course Deviation Bar

9. FAIL FLAGS LOSS OF RELIABLE NAV SIGNAL OR VHF NAV SET FAILURE
Visible when a failure occurs in the magnetic compass system

10. MODE SELECT PANEL
NOTE: The switches on the HIS/VSI and CIS mode select panels may change state when the caution/advisory panel BRT/DIMTEST switch is set to TEST. The original indications may be restored by pressing the applicable switches.

11. Directs FM Homing Deviation And Flag Signals To VSIs.
Reverses the VOR / Localizer Polarity So That The Course Deviation Pointer And Bar Are Pictorially Correct .
Directs FM Homing Deviation And Flag Signals To VSIs.
Directs Long Range NAV Lateral Deviation And NAV Flag Signals To VSIs And HSIs.
Directs VOR Or ILS Signals to VSIs, And HSIs. Provides A Signal To NAV flag.
VOR
BACK
CRS FM
HOME
DLPR
ILS
ALTR
CPLT
ALTR
VOR
Connects Pilots or Co-Pilots Turn Rate Indicator To Either Their Own Gyro Or The Other Station’s Gyro In Case Their Gyro Fails.
Connects The #2 Bearing Pointer To The VOR Or The ADF.
Connects Either The Pilot’s or The Co-Pilot’s OBS To The Navigation Receiver. Also Provides Concurrent Connection Of Either The Pilot’s or The Co-Pilot’s HSI Course Datum And Heading Datum Output To The CIS Processor. Defaults To Pilots Side When Power Is Applied. Either Pilot Can “Take Command”.
Connects Pilots or Co-Pilots Sphere (Attitude Indicator) To Either Their Own Gyro or The Other Station’s Gyro In Case Their Gyro Fails.

12. CIS DEFINED
The CIS processes navigational data, aircraft attitude, airspeed, and altitude information appropriate for the 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.

13. CIS PROCESSOR (CISP) LOCATION

14. CIS MODE SELECT PANEL ON ON ON
The CIS mode select panel selects one of three modes (Heading, Navigation, or Altitude) of operation to direct navigational signals to the CISP for command signal display.

15. 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.
Note: If Outside The Capture Zone, Pressing NAV Will Automatically Activate HDG.
Note: If Localizer Frequency Is Entered, HDG and ALT Will Automatically Activate If Outside Capture Zones
Direct Heading And Roll Signals To CIS Processor For Steering Commands That Will Allow Pilot To Maintain A Selected Heading. ON ON ON
Directs Barometric Pressure Signals And Collective Stick Position Signals To CIS Processor. Altitude Hold May Be Activated By Itself Or In Conjunction With HDG And/Or NAV Modes.

16. HOW DO YOU USE THE COMMAND BARS AND COLLECTIVE POSITION INDICATOR?
SIMPLE: They are giving you directional commands that need to be complied with NOW
IMPORTANT
This is Processed Data not Raw Data, thus you maneuver the aircraft until the Bar(s) and/or Collective Position Indicator are centered. There is no intercepting! Adjust PITCH, ROLL and COLLECTIVE until the indicators are centered and continue to make the necessary inputs to keep them centered.
As you see, the Roll Command Bar is to the right, so bank right until the bar is centered.
As you see, the Pitch Command Bar is above the horizon, so pitch the nose up until the bar is on the horizon.
As you can see, the Collective Position Indicator is below the two centering triangles. So again, raise the collective until the indicator is between the two triangles

17. ALTITUDE HOLD
Selecting the ALT switch engages the altitude hold mode and couples either the barometric or radar altimeter (depending on sub-mode) to the collective position indicator.
Altitude hold will engage at the altitude the ALT switch is pressed provided the rate of climb or descent does not exceed 200 feet per minute, altitude is between feet and +10,000 feet, and airspeed is between 70 and 150 KIAS.
The CISP provides collective command signals which, if followed, return the aircraft to within ±50 feet of the originally selected altitude.
When in the level off submode, the altitude hold mode commands collective movement to maintain the absolute altitude selected on the radar altimeter.

18. Push the ALT Button on the CIS Mode Select Panel. ON
Once activated, if your altitude increases, the Collective Position Indicator will move up.
If you descend below your altitude, the indicator will move down. Again pull up on the collective and keep it centered to climb and level back off.
Move the collective down till the indicator is centered. This will start a descent and by moving the collective as necessary to keep it centered will level the aircraft off at the altitude that was referenced.
Be Sure Animations Are Finished Before Clicking For Next Sequence Or Slide
Push the ALT Button on the CIS Mode Select Panel. ON

19. HEADING MODE
Selecting the HDG mode switch couples the heading select marker to the roll command bar.
Signals from the CISP command the roll command bar to deflect in the direction of the required cyclic control input.
The HDG mode assists in maintaining a turn by providing one degree of roll command for each degree of heading error with a maximum roll command of 20o.

20. HEADING MODE (Cont)
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 two degrees and will command wings level when the selected heading is reached.
The HDG mode will automatically turn on if NAV is selected and the aircraft is not within 10°- 20° of the selected course in the VOR NAV mode or within approximately 2.5° of the localizer course in the ILS NAV mode. The HDG mode will then automatically switch off when the aircraft is within 10º- 20° of the selected course in the VOR NAV mode or within 2.5º of the localizer course in the ILS NAV mode.

21. Now Bank The Aircraft Left Until The Roll Command Bar Is Centered
Turn HDG Knob And Move Heading Marker To Desired Heading. Since The Heading is To Our Left, The Roll Command Bar Now Deflects To The Left Telling The Pilot To Turn Left
As The Aircraft Heading Approaches The Heading Selected By The Pilot On The HSI, The Roll Command Bar Now Deflects Right. By Banking Right And Keeping The Roll Command Bar Centered, The CIS Will Roll The Aircraft Onto The Desired Heading
Press The HDG Button On CIS Mode Select Panel. Heading Mode Is Activated And The Roll Command Bar Appears And Is Now Slaved To The Heading Marker On The HSI
Now Bank The Aircraft Left Until The Roll Command Bar Is Centered
Be Sure Animations Are Finished Before Clicking For Next Sequence Or Slide on

22. Uninterrupted
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23. Overhead View
Be Sure Animations Are Finished Before Clicking For Next Sequence Or Slide

24. NAV MODE
The initial course interception and the localizer course interception will result in not more than one overshoot at a range of 10 NM at 100 ±10 KIAS and not more than two overshoots at ranges between 5 and 20 NM for airspeeds between 70 and 130 KIAS.
The collective position indicator when properly followed, will result in not more than one overshoot in acquiring the glide path and have a glide path tracking free of oscillations at an approach airspeed from 130 KIAS down to 50 KIAS.
Remember that the CISP remains off when the NAV switch is selected unless the DPLR/GPS, VOR, ILS, or FM HOME navigation mode has been selected on the pilot’s HSI/VSI mode select panel.

25. NAV MODE (Cont)
With one of the navigation modes selected (DPLR/GPS, VOR, ILS, or FM HOME) the CIS NAV switch selects the CISP and couples the selected navigation system on the pilot’s HSI/VSI mode select panel (Pilots course deviation pointer) to the roll command bar.
With a navigation mode selected and NAV ON, the roll command bar displays aircraft turns necessary to track the navigation signal.
The VOR NAV mode is entered by selecting VOR on the HSI/VSI mode select panel and NAV ON, on the CIS mode select panel.

26. NAV MODE (Cont)
If the helicopter position is in excess of 10º- 20° from the selected VOR radial (set in the HSI course set display window), the initial course intersection is made in the heading mode (HDG ON) until the helicopter is within the capture zone.
When the helicopter is within the capture zone, the CISP commands the heading mode to automatically drop out, and commands a 45º intercept to the selected VOR course (HSI course set display window).
The capture zone for VOR is within 10º- 20° of the selected VOR course.
When passing over the VOR station, the CISP reverts to a Station Passage Sub-Mode for 30 seconds. Cyclic roll commands during this mode will be obtained from the HSI Course Datum signal.

27. Capture Zones: Long Range Navigation (LRN) Mode
(Doppler NAV Mode)
ACP
200 Meters
200 Meters
< 2 KM
Meters
Meters
1000 Meters
12 to 2 KM
1000 Meters
> 12 KM

28. Capture Zones: VOR NAV Mode
10o- 20o
10o- 20o

29. Capture Zones: ILS NAV Mode
Glide Slope - (After Glide Slope Interception)
.5o
Localizer / Localizer Back Course
2.5o
2.5o

30. NOTE The next slide shows a simulation of the NAV Mode
NOTE The next slide shows a simulation of the NAV Mode. The purpose of the simulation is to show how CIS basically functions. Although The Course Deviation Pointer is not shown on the VSI, the Course Deviation Pointer would be visible and responding as does the Course Deviation Bar in the real aircraft. Include the Course Deviation Pointer to all references in the next slide regarding the Course Deviation Bar.

31. ATC: “Army 12345, Turn Right To 135 Degrees And Intercept The 060 Course To The Wiregrass VOR, Then Resume Own Navigation. “
Start A Right Turn And Keep The Roll Command Bar Centered Through Roll Out
The Head Of The #2 Bearing Pointer Is Now Being Pushed To The 060 Course
Course Deviation Bar Deflects To The Right 1 2
Enter 060 Into The Course Window Using The CRS Knob
Now On A 45 Degree Intercept
Turn HDG Marker to 135 Using the HDG Knob
Select VOR For The #2 Bearing Pointer
Within Capture Zone: Course Deviation Bar Starts To Move, HDG Mode Automatically Disengages And Roll Command Bar Deflects Left To Position Aircraft For A 45 Degree Intercept. Continue To The Follow Roll Command Bar
HDG Mode Automatically Engages And Roll Command Bar Comes Into View And Deflects To The Right Since Outside The VOR Capture Zone
Press NAV Switch
Be Sure Animations Are Finished Before Clicking For Next Sequence Or Slide on on
Enter Appropriate VOR Frequency Then Select VOR
VOR
VOR

32. Uninterrupted 1 2
Be Sure Animations Are Finished Before Clicking For Next Sequence Or Slide on on
VOR
VOR

33. Overhead View
Within The VOR Capture Zone. Turn To The Left To Intercept Course At A 45o Angle
Heading Of 060o
Right Turn To 135o
Interception Of Course 060o With No More Than One Over Shoot
Be Sure Animations Are Finished Before Clicking For Next Sequence Or Slide

34. NOTE Although the preceding simulation used a VOR for Navigation, the same indications would be observed if the Mode Select panel was in the DPLR mode. The only difference would be the capture zones as shown earlier.

35. ILS NAVMODE
ILS NAV mode is entered by selecting ILS on the HSI/VSI mode select panel and NAV ON on the CIS mode select panel. Intercepting the localizer course is done in the same manner as the previous NAV mode simulation. Except the Capture Zone is 2.5o vs. 10°- 20°.
With the ILS NAV mode selected, the Pitch Command Bar is coupled to the airspeed indicated on the airspeed indicator at the time NAV is selected.
This provides a limited cyclic pitch command which when followed properly, results in maintaining an airspeed that should not deviate more than 5 knots from the IAS existing at the time the ILS NAV mode was engaged.

36. ILS NAV MODE (Cont)
During ILS NAV mode the barometric altitude and collective stick position signals are processed to provide a limited collective position indication, which when followed causes the helicopter to maintain the altitude existing at the time the ILS NAV mode is engaged.
During an ILS approach, when the helicopter enters the localizer capture zone, the HDG ON mode automatically disengages.
The APPROACH mode, a Sub-Mode of the ILS NAV mode, will be automatically engaged when the helicopter captures the glide slope.
When the glide slope is intercepted during the Approach mode, the ALT ON mode automatically disengages.
The cyclic roll commands are limited to ±15° during the Approach mode.

37. ILS NAV Mode
When NAV Switch Is Pressed, ALT Switch Illuminates Along With The HDG Switch If Outside The Capture Zones
The Pitch Command Bar Will Come Into View And Provide Commands That Will Maintain Airspeed When Kept Centered Using Fore And Aft Cyclic Inputs
“ILS” Will Illuminate When A Localizer Frequency Is Entered 1 2
#2 Bearing Pointer Now Points To The LOM. Upon Station Passage It Will Swing 180 Degrees
Number #2 Bearing Pointer Is Inop When VOR Is Selected And A Localizer Frequency Is Entered. If A LOM Is Available, Select ADF
As You See, We Have Pitched The Nose Up And Now The Pitch Command Bar Has Moved Below The “Miniature Airplane”, Indicating Our Airspeed Has Slowed
In-Addition, The Collective Position Indicator Also Comes Into View And When Followed, Will Maintain Altitude Until Glide Slope Interception
Push Forward On the Cyclic To Center The Pitch Command Bar. This Will Increase Your Airspeed To What Was Referenced When The NAV Button Was Pushed
Be Sure Animations Are Finished Before Clicking For Next Sequence Or Slide on on on
Intercepting and tracking the Localizer Course is the same as intercepting and tracking the VOR course in the previous simulation. There are some differences in regards to instrument indications however…
ILS
ADF
VOR

38. APPROACH MODE
By Centering The Collective Between The Centering Triangles and Keeping The Collective Centered, The Aircraft Will Intercept and Stay On Glide Path
We Are Executing An ILS Approach. We Are Centering The Roll And Pitch Command Bars And Are Tracking Inbound On The Localizer. We Are Now Approaching The Glide Slope…
If We Allow The Aircraft To Go Above The Glide Slope We Get The Following Indications. The Collective Position Indicator Is Telling Us To Lower The Collective
The Glide Slope Indicator Appears And Moves Down The Scale As The Aircraft Approaches The Glide Path
The Collective Position Indicator Is Now Slaved To The NAV And Is Coupled To The Glide Slope
The ALT Hold Function Deactivates
Be Sure Animations Are Finished Before Clicking For Next Sequence Or Slide ON ON

39. UNINTERUPTED
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40. Go Around Mode * * Press Go Around Button on Cyclic
Roll Command Bar provides zero degree bank angle
Press Go Around Button on Cyclic * *
Note: 5 Seconds After GA Button Pressed

41. 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.
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.

42. Level Off Mode (Cont)
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.
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.

43. FM HOMING
The FM HOME mode couples FM homing signals from FM #1 to the NAV systems.
The FM HOME mode is engaged by turning on FM #1 and selecting the HOME function on the control box.
In order for the FM HOME mode to be engaged, the ILS mode select light must not be lit (ILS deselected), and the FM HOME light must be illuminated and the NAV switch on the CIS mode select panel must be set to ON.
The CISP sends these FM homing signals to the VSI only. The signals from the CISP are applied to the VSI Deviation Pointer, Roll Command Bar and Navigation Off Flag.

44. Rule of 5
(1) There are five rules that apply to the HSI/VSI indicators in the UH60 helicopter. (2) These rules are referred to as the "Rule of 5“ Rule #1: The #1 Bearing pointer is slaved to the Doppler/GPS only. Rule #2: The #2 Bearing pointer can have one of two inputs, either from VOR or ADF. Rule #3: The Course Deviation Bar (HSI) can have one of three inputs, either Doppler/GPS, VOR, or Localizer. Rule #4: The Course Deviation Pointer (VSI) can have one of four inputs, either Doppler/GPS, VOR, Localizer, or FM Home. Rule #5: The Roll Command Bar on the VSI can have one of five inputs, either Doppler, VOR, Localizer, FM Home, or Heading.

45. Refer To Your Student Handouts And TM 1-1520-253-10, Chapter 2 For More Detailed Information

46. QUESTIONS