KMC Controls rc allen instruments RCA 2610-P Series Original operating instructions

KELLY MANUFACTURING COMPANY
555 SOUTH TOPEKA
WICHITA, KS 67202
[phone]
FAX [phone]
KELLYMFG.COM
KELLY MANUFACTURING COMPANY
KMC
RCA 2610-P SERIES
PITOT-STATIC
ELECTRIC DIGITAL HORIZON
INSTALLATION/OPERATION GUIDE
RCA 2610-3P (3 inch) RCA 2610-2P (2 inch)
Rev FNovember 17, 2021
RCA 2610-3P-G (3 inch) RCA 2610-2P-G (2-inch)
WITH PITCH SYNC
WITHOUT PITCH SYNC
KMC PUBLICATION NO. 1401-6
DIM
PITCH SYNC
DIM
10
10
20
20
10
10
20
20
DIM
DIM
10
10
20
20
10
10
20
20

RCA2610-P Series Installation/Operation Guide
Page 1 of 15
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
TABLE OF CONTENTS
PAGE
SECTION 1 INSTRUMENT DESCRIPTION 2
1.1 General Description...................................................................... 2
1.2 Physical Description ..................................................................... 2
1.3 Display Features .......................................................................... 5
 1.4 StandardCongurations............................................................... 6
1.5 Optional Features......................................................................... 6
SECTION 2 INSTALLATION 7
2.1 General Information...................................................................... 7
2.2 Handling ....................................................................................... 7
2.3 Pre-Installation Inspection ............................................................ 7
2.4 Installation .................................................................................... 7
SECTION 3 OPERATION 8
3.1 Pre-Flight Procedures................................................................... 8
3.2 In-Flight Procedures - Pitch Sync................................................. 8
3.3 In-Flight Procedures - Dimmer ..................................................... 9
3.4 Flight Limitations .......................................................................... 9
3.5 Emergency Procedures................................................................ 9
SECTION 4 GENERAL INFORMATION 10
4.1 Flight Testing and Adjustments .................................................... 10
4.2 Instrument Care........................................................................... 10
4.3 Optional Slip Indicator ................................................................. 10
4.4 Battery Replacement................................................................... 11
4.5 Frequently Asked Questions (FAQs)........................................... 12
APPENDIX A DO-160G ENVIRONMENTAL QUALIFICATION FORM 13
APPENDIX B INSTRUCTIONS FOR AIR WORTHINESS 14
APPENDIX C TABLE OF PART NUMBERS 15
LIST OF ILLUSTRATIONS
Figure 1.1, General Dimensions.............................................................. 3
Figure 1.2, General dimensions (-G Models) .......................................... 4
Figure 1.3, Typical Display Features ....................................................... 5
Figure 1.4, Rate of Turn Indication .......................................................... 6
Figure 3.1, Pitch Sync ............................................................................. 8
Figure 3.2, Dimmer Controls ................................................................... 9
Figure 4.1, Slip Indicator Installation ...................................................... 10
LIST OF TABLES
Table 1.1, Leading Particulars ................................................................. 2
 Table1.2,StandardCongurations ......................................................... 6
REVISION DETAIL
REVISION DATE DETAIL
A03/07/2018 Initial Release.
B12/10/2018 Update software and part number changes. Add Flight Testing Section 4.1.
C06/05/2019 Updateentiremanualtoreectnewoptions.
D04/28/2021 Added Battery Replacement Section 4.4
E06/30/2021 Revised Section 3.4 Flight Limitations.
F11/17/2021 Update Software Version.

Page 2 of 15
RCA2610-P Series Installation/Operation Guide
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
SECTION 1: INSTRUMENT DESCRIPTION
1.1 GENERAL DESCRIPTION
Anattitudeindicator,alsoknownasagyrohorizonorarticialhorizon,isaninstrumentusedinanaircrafttoinformthepilotofthe
orientation of the airplane relative to the earth. It indicates pitch (fore and aft tilt) and bank (side to side tilt), and is a primary instru-
mentforightininstrumentmeteorologicalconditions.Attitudeindicatorsalsohavesignicantapplicationsundervisualightrules.
The RCA2610-P is a Digital Attitude Indicator that has no gyroscope. It utilizes several internal accelerometers to provide Pitch and
Roll information. Airspeed is part of the calculations needed in this process. In some instances with high performance aircraft, sud-
denacceleration/decelerationorhighg-forcesadverselye󰀨ecttheaccelerometerspeedcalculations.TheRCA2610-P Series adds
Pitot-Statc airspeed input which ensures constant and accurate speed data for greater reliability.
Because the RCA2610-P has no mechanical gyroscope, it is much more stable than traditional horizons. The unit is designed to
work in 360 degrees of pitch and roll and, unlike a mechanical unit, the RCA2610-P can tolerate angles in pitch and roll that would
cause a gyroscopic unit to tumble.
On the attitude indicator you will see two yellow horizontal lines with a dot between them. The horizontal lines represent the wings
and the dot represents the nose of the aircraft. If the symbolic airplane dot is above the horizon line (more blue background) - the
aircraft is nose up. If the symbolic airplane dot is below the horizon line (more brown background) - the aircraft is nose down. When
thedotandwingsareonthehorizonline,youareinlevelight.Ifthelinesrepresentingthewingsrolltotheleftortheright,the
aircraft is probably starting a turn. The actual bank angle is calibrated around the circumference of the instrument dial. The pitch
angle is indicated by a series of calibration lines, each representing 5° or 10° of pitch.
1.2 PHYSICAL DESCRIPTION
There are two basic models, the RCA2610-P (P for Pitot-Static) which has Pitch Sync and the RCA2610-P-G which does not have
Pitch Sync. The Pitch Sync feature allows the pilot to adjust the symbolic airplane to match the horizon during pitch up or pitch
downlevelight.Bothversionscomeinstandard3inchand2inchsizes.Refertotable1.1belowforalistofleadingparticulars.
OPERATING VOLTAGE.......................................................................................................................................... 9 to 32VDC
STARTING CURRENT............................................................................................................ 9VDC: 0.18 to 0.22 AMPs MAX
RUNNING CURRENT ...................................................................................... (14VDC SYSTEM) ..................0.20 AMP MAX
(28VDC SYSTEM) ..................0.15 AMP MAX
CIRCUIT BREAKER SIZE............................................................................................................................................... 1 AMP
SETTLING ERROR........................................................................................................... 1º MAXIMUM IN ROLL AND PITCH
OPERATING TEMPERATURE RANGE.............................................................................................................-20º TO +55º C
MATING CONNECTOR ........................................................................................................MS3116E8-4S OR EQUIVALENT
WEIGHT ........................................................................................................... RCA2610-3P....................................... 6.75 oz
RCA2610-2P....................................... 4.75 oz
DIMENSIONS/PANEL CUTOUT .....................................................................................................SEE FIGURES 1.1 and 1.2
EYE VIEWING ANGLE ENVELOPE ....................................................................Horizontal Left and Right: 35°Left, 35°Right
Vertical Up and Down: 35°Up, 35°Down
Minimum distance from display surface: 6 inches
Maximum distance from display surface: 48 inches
SOFTWARE VERSION.......................................................................................................................................Version 3.0.12
FAA SPECIFICATION CONFORMANCE............................................................................... DO-160G and DO-178B Level C
 SeeAppendixCforTSOCerticationbypartnumber
MEETS OR EXCEEDS ........................................................................................................... AS8034A, AS8004 and AS396B
TABLE 1.1, LEADING PARTICULARS

RCA2610-P Series Installation/Operation Guide
Page 3 of 15
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
Figure 1.1, General Dimensions (-P Models)
A
BC
D
3.17
1.237
(TYP)
2.474
(TYP)
0.08 1.22 0.40
3.37
3.37
0.928
(TYP) 1.855
(TYP)
2.28
2.40
2.75 0.12 1.22 0.40
A
BC
D
Ø 0.170 THRU
(4 PLACES)
Ø 0.170 THRU
(4 PLACES)
DIM
10
10
20
20
10
10
20
20
10
10
20
20
10
10
20
20
NOTE
•
All dimensions in inches.
•
Mounting Hardware (both units)
6-32 screw - 0.5” plus panel thickness
•
Mating Connector (both units)
MS3116E8-4S or equivalent.
PANEL CUTOUT
REAR MOUNTING
PANEL CUTOUT
REAR MOUNTING
RCA2610-3P
RCA2610-2P
A
B
D
C
GROUND
9-32 VDC
SPARE
SPARE
A
B
D
C
GROUND
9-32 VDC
SPARE
SPARE
DIM
PITCH SYNC
DIM
PITCH SYNC
DIM
STATIC PORT
1/8 NPT
PITOT PORT
1/8 NPT
STATIC PORT
1/8 NPT
PITOT PORT
1/8 NPT

Page 4 of 15
RCA2610-P Series Installation/Operation Guide
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
Figure 1.2, General Dimensions (P-G Models)
A
BC
D
3.17
1.237
(TYP)
2.474
(TYP)
3.37
3.37
0.928
(TYP) 1.855
(TYP)
2.28
2.40
2.75
A
BC
D
Ø 0.170 THRU
(4 PLACES)
Ø 0.170 THRU
(4 PLACES)
DIM
0.08 1.22 0.40
10
10
20
20
10
10
20
20
10
10
20
20
10
10
20
20
NOTE
•
All dimensions in inches.
•
Mounting Hardware (both units)
6-32 screw - 0.5” plus panel thickness
•
Mating Connector (both units)
MS3116E8-4S or equivalent.
PANEL CUTOUT
REAR MOUNTING
PANEL CUTOUT
REAR MOUNTING
RCA2610-3P-G
RCA2610-2P-G
A
B
D
C
GROUND
9-32 VDC
SPARE
SPARE
A
B
D
C
GROUND
9-32 VDC
SPARE
SPARE
DIM
DIM
STATIC PORT
1/8 NPT
PITOT PORT
1/8 NPT
STATIC PORT
1/8 NPT
PITOT PORT
1/8 NPT
DIM
0.12 1.22 0.40

RCA2610-P Series Installation/Operation Guide
Page 5 of 15
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
Figure 1.3, Typical Display Features
1.3 DISPLAY FEATURES
See Figure 1.2 below for typical display features. RCA2610-3P shown.
1. ROLL POINTER
The Roll Pointer points to the degree of roll against the Roll Dial.
2. ROLL DIAL
The Roll Dial shows the degree of roll against the Roll Pointer.
3. HORIZON LINE
Indicates earth horizon relative to aircraft pitch and roll.
4. SLIP INDICATOR
Also referred to as an Inclinometer, the Digital Slip Indicator measures the relative strength of the force of gravity and the
force of inertia caused by a turn; thus indicating whether the aircraft is slipping or skidding. (Add-on mechanical option also
available for all RCA2610 models)
5. RATE OF TURN INDICATOR (OPTIONAL)
Displays graduated scale to provide standard Rate of Turn.
6. BATTERY CHARGE STATUS INDICATOR (OPTIONAL)
Indicates the amount of battery charge (on instruments with the Battery Backup Option).
7. SYMBOLIC AIRPLANE
Represents the orientation of the aircraft’s wings and nose in relation to the horizon. The dot represents the nose of the air-
craft and indicates Pitch. The wings indicate roll.
8. PITCH DIAL
Indicates the Pitch angle as determined by the Symbolic Airplane dot.
DIM
10
10
20
20
DIM
PITCH SYNC
1 ROLL POINTER
2 ROLL DIAL
3 HORIZON LINE
4 SLIP INDICATOR
5 RATE OF TURN
INDICATOR
7 SYMBOLIC
AIRPLANE
8 PITCH DIAL
6 BATTERY
CHARGE

Page 6 of 15
RCA2610-P Series Installation/Operation Guide
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
1.4 STANDARD CONFIGURATIONS
Forallavailableoptionsandcongurations,refertoTable1.2,belowandAppendixCinbackofmanual.
Panel Tilt Angle setting Set to customer requirements
Mating Connector MS3116E8-4S or equivalent
Color Scheme Standard Blue & Brown
Display pointer style Fixed
Power Failure Indication Flag All models
Brightness Adjust All models
Table 1.2, Standard Congurations
1.5 OPTIONAL FEATURES
SLIP INDICATOR
Digital or mechanical add-on Slip Indicator.
PITCH SYNCHRONIZATION
Allowsyoutoquicklysetthesymbolicairplanetothehorizonlinewhenyinginanoseupornosedownpitchattitude.
(See Section 3.2)
RATE OF TURN INDICATOR
Displays graduated scale to provide standard Rate of Turn. (See Figure 1.4)
BATTERY BACKUP
Automatically provides up to an hour of battery power in the event of a power loss.
Associated battery messages:
“Batt Pwr” indicates when the unit is operating in the Battery Mode.
(To shutdown Battery Mode, simultaneously press and hold both “Dim” buttons).
“Chk Batt” indicates that either the battery failed the capacity test or is inoperable (See Section 4.4 Battery Replacement).
NVIS COMPATIBLE
EquippedwithaninternalNVIScompatiblelter.
NOTE
●Units with the Slip Indicator option that do not have the Rate of Turn option, only hold a partial or
“incomplete” TSO-C3e because the unit only meets the slip aspects of the TSO and not the turn rate
aspects.
●The optional Battery Pack attaches to the rear of the instrument and adds 0.45 inches to the depth of
the unit. (See appendix B for replacement intervals).
DIM DIMDIM
10
10
20
20
DIM
PITCH SYNC
10
10
20
20
DIM
PITCH SYNC
10
10
20
20
DIM
PITCH SYNC
2 MINUTE TURN 4 MINUTE TURN 1 MINUTE TURN
Figure 1.4, Rate of Turn Indication.

RCA2610-P Series Installation/Operation Guide
Page 7 of 15
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
SECTION 2, INSTALLATION
2.1 GENERAL INFORMATION
The conditions and test required for the TSO approval of this article are minimum performance standards. It is the responsibility of
thoseinstallingthisarticleeitheronorwithinaspecictypeorclassofaircrafttodeterminethattheaircraftinstallationconditions
are within the TSO standards. TSO articles must have a separate approval for installation in an aircraft. The article may be installed
only if performed under 14CFR Part 43 or the applicable airworthiness requirements.
ForcertainclassesofPart23aircraftlevelCofDO-178Bcerticationmaynotbesu󰀩cient-checkwithyourlocalregulatory
authority prior to installation.
2.2 HANDLING
Although the RCA2610-P Series instruments are totally electronic, improper handling can cause damage. Please observe the
following precautions while handling.
1. Do not drop, jar or shake instrument. Store instrument in shipping container until installation.
2. Instruments should be transported in the original shipping container when moved to and from aircraft. If container is not
available, carefully carry by hand in upright position.
3. Avoid touching the screen. This is the most vulnerable part of the instrument. Improper handling and cleaning can cause
permanent scratching of the screen surface (See Instrument Care on Page 9).
4. To prevent further damage, a malfunctioning instrument should be handled as carefully as a new instrument. Most mal-
functioning instruments can be repaired and returned to service. Contact Kelly Manufacturing Company for repair and
warranty information.
2.3 PRE-INSTALLATION INSPECTION
1. Whentheinstrumentisrstreceived,inspectcontainerforanyshippingdamage.
2. Carefully remove the instrument from shipping container and retain container for later storage or shipping.
3. Inspecttheinstrumentforanysignsofdamage.ContactyourShippertoleanyclaimduetoshippingdamage.
4. Check labeling on the instrument to assure that the instrument panel tilt angle is correct for your aircraft.
2.4 INSTALLATION
Install the instrument on the aircraft by using the aircraft manufacturer’s recommendations and by the following steps:
1. The RCA2610-P Series Horizon uses standard panel cutouts. Refer to Figures 1.1 and 1.2 “General Dimensions”
for instrument and cutout dimensions.
2. Instrument Pinout is: A = GND, B = PWR, C = SPARE, D = SPARE. CAUTION: Do not apply power to Spare pins
as damage may occur. See table 1.1 “Leading Particulars” for additional electrical information.
3. Attach pitot-static lines (if required) and aircraft electrical connector to the instrument and insert into the instru-
ment panel cutout (See Figures 1.1 and 1.2).
4. Secure instrument with supplied screws. Use 6-32 UNC-2b screws or equivalent. Screw length should not ex-
ceed .5 inches plus bezel and panel thickness. Do not tighten.
5. With the aircraft on level surface, apply power to the instrument and allow it to warm up for 3 minutes.
6. Adjust roll position of the instrument by visually aligning the roll pointers. The Horizon Line should be level and
unbroken. Tighten screws.
Do Not modify the instrument in any way.AnymodicationswillvoidthewarrantyandrevoketheFAAcertications.

Page 8 of 15
RCA2610-P Series Installation/Operation Guide
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
Figure 3.1, Pitch Sync
SECTION 3, OPERATION GUIDE
3.1 PRE-FLIGHT PROCEDURES
Duringpre-ightprocedures,theinstrumentmustbeprovidedwithadequateelectricalpowerundernormalvibrationconditions
(engine running). A red “X” appears across the screen indicating that the instrument is booting up. When the X disappears, the
instrument is ready. The startup process should be completed within three minutes.
When applicable, check that the Battery Charge Status Indicator displays at least 50% charge to ensure a minimum of 30 minutes
of battery operation in the event of a power failure.
NOTE
Ontail-draggeraircraft,theindicatorwillnotshowasleveluntilafterachievinglevelight.Noadjustmentare
necessarywhenlevelightisachieved.
3.2 IN-FLIGHT PROCEDURES - PITCH SYNC
(Selected models only)
Ifyoutypicallyyina“nosedown”or“noseup”pitchattitude, you can adjust the Airplane Symbol to match the Horizon Line on your
instrument. The Pitch Synchronization (Pitch Sync) feature allows you to instantly sync the Airplane Symbol to the Horizon.
NOTE
This feature is not necessary for most aircraft and is to be usedonlyinsituationswherenormalightpitchis
deviated from 0 degrees.
PITCH SYNC ACTIVATION
Onceyouhaveachievedthedesiredyingpitch,activatethePitchSyncfeaturebypressingBOTH PUSH BUTTONS simultaneously.
This synchronizes the Airplane Symbol to the Horizon Line.
TheSync‘On’indicatorwilldisplay“SYNC”whenthePitchSyncisactivated(seegure3.1).
PITCH SYNC DE-ACTIVATION
To return to True Pitch, press BOTH PUSH BUTTONS simultaneously. This moves the Airplane Symbol back to True Pitch Indica-
tion and the Sync ‘On’ indicator will disappear.
EXAMPLE
IntheexampleshowninFigure3.1,Theaircraftisyinglevelata10degreenosedownpitchwiththePitchSyncon.TheSync
‘On’ Indicator is being displayed. The True Pitch Horizon is indicated by the bottom Tick Mark on the Roll Dial which is aligned with
the 10 degree mark on the Pitch Dial. The Airplane Symbol is shown aligned with the Horizon Line at 0 degrees on the Pitch Dial.
20
10
30
10
10
20
10
30
DIM
DIM
PITCH SYNC
PUSH
BUTTONS
PUSH
BUTTONS
SYNC PITCH
INDICATION
TRUE PITCH
INDICATION
SYNC PITCH
INDICATION
TRUE PITCH
INDICATION SYNC 'ON'
INDICATOR
SYNC 'ON'
INDICATOR
RCA2610-2P RCA2610-3P

RCA2610-P Series Installation/Operation Guide
Page 9 of 15
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
3.4 FLIGHT LIMITATIONS
TherearenoightlimitationstotheRCA2610-P Series Attitude Indicator. The instrument will operate in a full 360 degrees of turn
and may be used in light aerobatic type maneuvers.
Extreme rotation speeds may cause the instrument to display a warning message to indicate to the pilot that the instrument may be
operatingoutsidetheaccuracylimitsdenedbytheTSO.Thismessageisdisplayedwhenthefullscaleoftheinstrumentsensors
is being exceeded and should go away within 3 to 10 seconds. Neither the display of the warning message, nor the extreme
rotationspeedsthemselves,negativelya󰀨ecttheinstrumentsoitisnotnecessarytoservicetheinstrumentintherareinstance
that the warning message is observed.
3.5 EMERGENCY PROCEDURES
In the rare event that your RCA2610-P does not reset itself, you will need to pull power to the unit and reset the circuit breaker.
Thiswillrestarttheunitandyoucancontinueonwithoutdamagetotheunit.Youdonotneedtobeyinglevelwhiletheunitresets.
In a low voltage situation, the RCA2610-P will show a “Low Voltage” warning notice at the bottom of the screen. This notice will
appear when the voltage goes below 11 volts. This notice will also indicate the amount of voltage the instrument is receiving. At 8.5
volts, a red “X” will appear across the screen indicating that the instrument reading is unreliable.
It is recommended that you install the Kelly Manufacturing ESP-1 (Emergency Standby Power) backup battery unit. This will
ensure that your instrument will have power in the event of Aircraft power failure. Contact your R.C. Allen/Kelly Mfg. distributor for
additional information about this product.
In the event that the pitot-static input is blocked, the internal accelerometers will continue to calculate airspeed and give an
accurate reading of pitch and roll.
Figure 3.2, Dimmer Controls
3.3 IN-FLIGHT PROCEDURES - DIMMER
On startup, the RCA2610-P defaults at its maximum brightness. You may adjust the screen brightness at any time by pressing the
DIMMER PUSH BUTTONS (DIM).
PressandholdtheDIM(▼)orBRIGHTEN(▲)PUSHBUTTONuntilyoureachthedesiredsettingandrelease,ortapeachbutton
forincrementalsteps(Seegure3.2fordimmingcontrols).
On non-Pitch Sync models (-G models), pressing both buttons simultaneously will reset the brightness to maximum.
On Pitch Sync models, pressing both buttons simultaneously will turn the PITCH SYNC feature on (as shown
bythePITCHSYNC‘ON’INDICATOR).PressbothbuttonsagaintoturnthePITCHSYNCo󰀨ifitisnot
needed. Refer to Section 3.2 for more information on the PITCH SYNC feature.
WARNING
10
10
20
20
10
10
20
20
10
10
20
20
DIM
10
10
20
20
DIM
DIM BRIGHTEN
DIM BRIGHTEN
DIM
DIM
PITCH SYNC
DIM BRIGHTEN
DIM BRIGHTEN
RCA2610-2P RCA2610-3P RCA2610-2P-G RCA2610-3P-G

Page 10 of 15
RCA2610-P Series Installation/Operation Guide
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
SECTION 4, GENERAL INFORMATION
4.1 Flight Testing and Adjustments
Afterighttestingandevaluation,additionalcalibrationmyberequireddependingontheuser’sapplication.Communicateight
test data with Kelly Manufacturing Company to determine appropriate adjustments.
4.2 Instrument Care
The most easily damaged part of your instrument is the screen. Special care should be taken when cleaning the screen to prevent
scratches and other damage. Avoid touching the screen at all times.
To clean light spots and dust, use a soft, lint free cotton cloth slightly moistened with distilled water.
You may also use cleaners approved for LCD TV’s and laptop computer screens. For harder to clean spots, use a 50/50 solution of
isopropyl alcohol and distilled water. Vinegar may also be used in a 50% solution with water.
Always apply the cleaner to the cloth and not the screen.
-CAUTION-
●Do Not use paper towels, facial tissue or napkins. These products are made from recycled paper and
may contain metals and wood chips that will scratch the screen.
●Do Not use acetone or cleaners containing ammonia.
By avoiding all screen contact and by using proper cleaning methods, the user will be rewarded with many years of service.
4.3 OPTIONAL SLIP INDICATOR
An optional Slip/Skid Indicator (inclinometer) is available for all versions of the RCA2610-P. The instrument can be purchased with
the Slip Indicator attached or purchased separately and installed by the user (part number 444-0010-01). The addition of a Slip
IndicatorsatisestherequirementsforFAA’sAC91-75.Theslipindicatormaybeattachedbeforeoraftertheinstrumenthasbeen
installed in the aircraft.
INSTALLATION
1. Apply power to the instrument to assure that it reads level in pitch and roll.
2. Remove two screws on the face of the instrument.
3. Align Inclinometer with holes and replace screws. Do not tighten.
4. Adjust the Slip Indicator until the bubble is centered and tighten screws just enough to secure Slip Indicator.
Do not over tighten.
Figure 4.1, Slip Indicator Installation
SCREWS
SLIP INDICATOR
DIM
PITCH SYNC

RCA2610-P Series Installation/Operation Guide
Page 11 of 15
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
Figure 4.2, Battery Replacement
4.4 BATTERY REPLACEMENT
When the “Chk Batt” warning appears on the screen, it indicates that either the battery failed the capacity test, there was a prob-
lem with the capacity test, or the battery is inoperable. Before replacing the battery, perform another capacity test by completing
steps 6 through 9 to re-test the battery. If this does not clear the “Chk Batt” message, the battery must then be replaced as soon as
possible. (See Figure 4.2 below) (replace battery with P/N 635-0002-01 Battery Assy).
To replace the battery:
1. Remove Battery Cover screws. (QTY: 2)
2. Remove Battery Cover.
3. Disconnect Battery Assembly.
4. Connect new Battery Assembly.
5. Reinstall Battery Cover and screws.
6. Apply power and allow the instrument to run for at least 3 minutes until the Battery Charge Status icon reaches 100%.
7. Adjust DIM buttons so that the screen brightness is at 100%.
8. Once the Battery Charge Status icon reaches 100%, disconnect power to the instrument and allow the instrument to
complete the 60 second countdown.
9. Reapply power and check that no battery related messages appear.
BATTERY
BATTERY CASE
SCREWS

Page 12 of 15
RCA2610-P Series Installation/Operation Guide
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
4.5 FREQUENTLY ASKED QUESTIONS
How long should my Digital Horizon last?
There isn’t a good answer for this question. There are no moving parts in the RCA2610-P so there isn’t anything to wear out. The
RCA 2610 should give hundreds of hours of trouble free operation.
At what voltage level will my Digital Horizon become unreliable?
Unlikemechanicalhorizons,theRCA2610-Pdoesn’thavearotorthatisa󰀨ectedbyvoltage.TheRCA2610-Pwillbereliablefrom9
to 32VDC.
My instrument is showing a climb/dive, what can I do?
You can check your aircraft owner’s manual or contact the aircraft manufacturer to determine if your aircraft’s instrument panel
istilted(pitchedforeandaft).Thetiltangleisanydeviationfromverticalofyourinstrumentpanelinlevelight.Yourinstrument
needs to be calibrated to compensate for this angle.
Myinstrumentisshowingaturninlevelight,whatcanIdo?
It is very important to have the instrument level (left and right) in your panel. If the instrument is not level, it will show a turn when in
levelight.Toleveltheinstrument,refertoinstallationSection2.4.6.
How do I get my instrument repaired?
For any overhaul or repair questions you can contact Kelly Manufacturing Company. Our Service Center can repair or refurbish
any R.C. Allen instrument. The only thing really required is information. You can send us your instrument with a letter giving us your
name, return shipping address, phone number and a brief description of what is wrong with the instrument or download a form from
the Support page on our web site at: kellymfg.com/support.html.
Email us for more information: [e-mail].
Or, Visit our Web Site: www.kellymfg.com

RCA2610-P Series Installation/Operation Guide
Page 13 of 15
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
APPENDIX A
Environmental Qualification: DO-160G Environmental Qualification Form
NOMENCLATURE: ELECTRIC DIGITAL HORIZON
MODEL NUMBER: RCA2610-series TSO NUMBER: C4c & C113a
MANUFACTURERS SPECIFICATIONS: STP 1501 Rev. A (12/20/2016)
MANUFACTURER: Kelly Manufacturing Company
ADDRESS: 555 S. Topeka, Wichita, KS 67202
REVISION & CHANGE NUMBER OF DO-160: Rev. G DATES TESTED: 4/26/16 thru 5/24/16
CONDITIONS
SECTION
DESCRIPTION OF TESTS CONDUCTED
Temperature and Altitude
Low Temperature
High Temperature
Altitude
4.0
4.5.1
4.5.2 & 4.5.3
4.6.1
Equipment tested to Category D1
Temperature Variation
5.0
Equipment tested to Category C
Humidity
6.0
Equipment tested to Category A
Operational Shocks and Crash Safety
7.0
Equipment tested to Category B
Vibration
8.0
Equipment tested to Category U2 curve F & F1
Explosive Atmosphere
9.0
Equipment identified as category X, no test performed
Waterproofness
10.0
Equipment identified as category X, no test performed
Fluids Susceptibility
11.0
Equipment identified as category X, no test performed
Sand and Dust
12.0
Equipment identified as category X, no test performed
Fungus
13.0
Equipment identified as category X, no test performed
Salt Fog Test
14.0
Equipment identified as category X, no test performed
Magnetic Effect
15.0
Equipment tested to Category Z
Power Input
16.0
Equipment tested to Category BRX
Voltage Spike
17.0
Equipment tested to Category A
Audio Frequency Susceptibility
18.0
Equipment tested to Category Z
Induced Signal Susceptibility
19.0
Equipment tested to Category ZC
Radio Frequency Susceptibility
(Radiated and Conducted) 20.0
Equipment tested for Conducted Susceptibility to Category W
Equipment tested for Radiated Susceptibility to Category F
Emissions of Radio Frequency Energy
21.0
Equipment tested to Category M
Lightning Induced Transient
Susceptibility 22.0
Equipment tested to
Pin Injection Test: Waveform set B, Level 3
Cable Bundle Test: Waveform set H, Level 3
Multiple Burst: Level 3
[B3H33]
Lightning Direct Effects
23.0
Equipment identified as category X, no test performed
Icing
24.0
Equipment identified as category X, no test performed
Electrostatic Discharge
25.0
Equipment tested to Category A
Fire, Flammability
26.0
Equipment identified as category X, no test performed
REMARKS
In the power input test, equipment was tested to subparagraph 16.5.1.4 b, requirement for equipment with digital
circuits
Equipment also tested to (and passed) section 20, SW/CW radiated susceptibility @100V/m from 100MHz to 1GHz

Page 14 of 15
RCA2610-P Series Installation/Operation Guide
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
APPENDIX B
Instructions for Continued Airworthiness
Equipment/Model Number: RCA2610 Series
Equipment Descripon: Electric Digital Horizon
1. Descripon
This document describes the necessary maintenance requirements and instrucons necessary to ensure the
connued airworthiness of aircra/rotorcrawith the RCA2610 Electric Digital Horizon installed.
2. Operaon
Operating Instrucons for the RCA2610 are detailed in the following document:
Kelly Manufacturing Company Operaon/Installaon Guide (Publicaon No. 1401-3 and 1401-6)
3. Equipment Cerficaons

FAA TSO-C4c
FAA TSO-C113a
FAA TSO-C3e

AS8034B
AS396B
AS8004

RTCA DO-160G
RTCA DO-178B Lv. C
3. Servicing
No scheduled service required
4. Maintenance Instrucons
Every 12 months:
Check that the RCA2610 Electric Digital Horizon is responding properly and operang within the guidelines
detailed in Kelly Manufacturing Company Publicaon No. 1401-3. Also verify the following
No warning/error message exists on the display.
No drop oor inconsistency in display brightness.
Every 24 months:
Check funconal indicaon accuracy
Note: Indicaon accuracy can be veried in ight test using the following procedure:
Aer take-oand before IFR situaons perform two turns in opposite directions of at least 15
degrees at approximately 1.3 G’s
Return aircrato level ight/cruising speeds for a minimum of 2 minutes.
Verify the RCA2610 indicates level in pitch and roll within two degrees.
Service is required if the RCA2610 does not pass this ight test. Instrument service can be performed at Kelly
Manufacturing Company [e-mail]
Every 36 months:
Replace Baery Assembly (635-0002-01) on applicable units equipped with a baery backup opon. Contact
Kelly Manufacturing Company for availability sparepart[email protected]
Airworthiness Limitaons
There are no airworthiness limitaons for the RCA2610
Reference secon 3.4 of Kelly Manufacturing Company Publicaon 1401-3 and 1401-6.

RCA2610-P Series Installation/Operation Guide
Page 15 of 15
Rev F
KELLY MANUFACTURING COMPANY
KMC
KMC Publication No.1401-6
Part Number
Size
Op�onal Features
TSO Cer�fica�ons
102-0403-04-05
3 inch
Pitch Sync
TSO-C4c, TSO-C113a
102-0403-04-07
3 inch
none
TSO-C4c, TSO-C113a
102-0403-04-13
3 inch
Pitch Sync, Ba�ery
TSO-C4c, TSO-C113a
102-0403-04-15
3 inch
Ba�ery
TSO-C4c, TSO-C113a
102-0403-06-06
3 inch
NVIS, Pitch Sync
TSO-C4c, TSO-C113a
102-0403-06-08
3 inch
NVIS
TSO-C4c, TSO-C113a
102-0403-06-14
3 inch
NVIS, Pitch Sync, Ba�ery
TSO-C4c, TSO-C113a
102-0403-06-16
3 inch
NVIS, Ba�ery
TSO-C4c, TSO-C113a
102-0403-08-05
3 inch
Slip Indicator, Pitch Sync
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0403-08-07
3 inch
Slip Indicator,
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0403-08-13
3 inch
Slip Indicator, Pitch Sync, Ba�ery
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0403-08-15
3 inch
Slip Indicator, Ba�ery
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0403-10-06
3 inch
NVIS, Slip Indicator, Pitch Sync
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0403-10-08
3 inch
NVIS, Slip Indicator
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0403-10-14
3 inch
NVIS, Slip Indicator, Pitch Sync, Ba�ery
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0403-10-16
3 inch
NVIS, Slip Indicator, Ba�ery
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0403-12-05
3 inch
Turn & Slip Indicator, Pitch Sync
TSO-C4c, TSO-C113a, TSO-C3e
102-0403-12-07
3 inch
Turn & Slip Indicator
TSO-C4c, TSO-C113a, TSO-C3e
102-0403-12-13
3 inch
Turn & Slip Indicator, Pitch Sync, Ba�ery
TSO-C4c, TSO-C113a, TSO-C3e
102-0403-12-15
3 inch
Turn & Slip Indicator, Ba�ery
TSO-C4c, TSO-C113a, TSO-C3e
102-0403-14-06
3 inch
NVIS, Turn & Slip Indicator, Pitch Sync
TSO-C4c, TSO-C113a, TSO-C3e
102-0403-14-08
3 inch
NVIS, Turn & Slip Indicator
TSO-C4c, TSO-C113a, TSO-C3e
102-0403-14-14
3 inch
NVIS, Turn & Slip Indicator, Pitch Sync, Ba�ery
TSO-C4c, TSO-C113a, TSO-C3e
102-0403-14-16
3 inch
NVIS, Turn & Slip Indicator, Ba�ery
TSO-C4c, TSO-C113a, TSO-C3e
102-0402-04-05
2 inch
Pitch Sync
TSO-C4c, TSO-C113a
102-0402-04-07
2 inch
none
TSO-C4c, TSO-C113a
102-0402-04-13
2 inch
Pitch Sync, Ba�ery
TSO-C4c, TSO-C113a
102-0402-04-15
2 inch
Ba�ery
TSO-C4c, TSO-C113a
102-0402-06-06
2 inch
NVIS, Pitch Sync
TSO-C4c, TSO-C113a
102-0402-06-08
2 inch
NVIS
TSO-C4c, TSO-C113a
102-0402-06-14
2 inch
NVIS, Pitch Sync, Ba�ery
TSO-C4c, TSO-C113a
102-0402-06-16
2 inch
NVIS, Ba�ery
TSO-C4c, TSO-C113a
102-0402-08-05
2 inch
Slip Indicator, Pitch Sync
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0402-08-07
2 inch
Slip Indicator,
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0402-08-13
2 inch
Slip Indicator, Pitch Sync, Ba�ery
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0402-08-15
2 inch
Slip Indicator, Ba�ery
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0402-10-06
2 inch
NVIS, Slip Indicator, Pitch Sync
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0402-10-08
2 inch
NVIS, Slip Indicator
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0402-10-14
2 inch
NVIS, Slip Indicator, Pitch Sync, Ba�ery
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0402-10-16
2 inch
NVIS, Slip Indicator, Ba�ery
TSO-C4c, TSO-C113a, [TSO-C3e - incomplete]
102-0402-12-05
2 inch
Turn & Slip Indicator, Pitch Sync
TSO-C4c, TSO-C113a, TSO-C3e
102-0402-12-07
2 inch
Turn & Slip Indicator
TSO-C4c, TSO-C113a, TSO-C3e
102-0402-12-13
2 inch
Turn & Slip Indicator, Pitch Sync, Ba�ery
TSO-C4c, TSO-C113a, TSO-C3e
102-0402-12-15
2 inch
Turn & Slip Indicator, Ba�ery
TSO-C4c, TSO-C113a, TSO-C3e
102-0402-14-06
2 inch
NVIS, Turn & Slip Indicator, Pitch Sync
TSO-C4c, TSO-C113a, TSO-C3e
102-0402-14-08
2 inch
NVIS, Turn & Slip Indicator
TSO-C4c, TSO-C113a, TSO-C3e
102-0402-14-14
2 inch
NVIS, Turn & Slip Indicator, Pitch Sync, Ba�ery
TSO-C4c, TSO-C113a, TSO-C3e
102-0402-14-16
2 inch
NVIS, Turn & Slip Indicator, Ba�ery
TSO-C4c, TSO-C113a, TSO-C3e
APPENDIX C
Table of Part Numbers

KMC PUBLICATION NO. 1401-6
KELLY MANUFACTURING COMPANY
555 S. TOPEKA
WICHITA, KANSAS 67202
WWW.KELLYMFG.COM