Plane-Power R1224 User manual

R1224 Regulator
Installation Instruction
12-1001 24-30-01
Rev. M: 01 Dec. 2021 Page: i
© 2021 - Hartzell Engine Technologies - All rights reserved
R1224 REGULATOR
INSTALLATION INSTRUCTIONS
P/N 12-1001

R1224 Regulator
Installation Instruction
24-30-01 12-1001
Page: ii Rev. M: 01 Dec. 2021
© 2021 - Hartzell Engine Technologies - All rights reserved
Copyright © 2021 Hartzell Engine Technologies LLC
All rights reserved. No part of this publication may be reproduced, stored in
a retrieval system, or transmitted, in any form or by any means, electronic,
mechanical, photocopying, recording, or otherwise, without the prior written
permission of Hartzell Engine Technologies LLC.

R1224 Regulator
Installation Instruction
12-1001 24-30-01
Rev. M: 01 Dec. 2021 Page: iii
© 2021 - Hartzell Engine Technologies - All rights reserved
RECORD OF REVISIONS
Revision
Level
Issue
Date
Page(s)
Revised Description
G 09/08/14 1 First release of Drawing No. 12-1001 into Hartzell Engine
Technologies Design Data.
H 09/08/14 1 Updated Master Drawing No. 12-1001 Title Block from Plane-Power, LTD
to Harzell Engine Technologies, LLC.
J 11/18/14 4 Changed Instruction for Continued Airworthiness to Maintenance
Instructions.
K02/01/17 2 Added website reference to Master Drawing No. 12-1001.
L04/30/18 ALL Revised to conform to iSpec 2200 Standard.
i Added HET standard cover page;
ii Added Record of Revisions;
iii Added Table of Contents;
2-1 thru 2-7 Removed redundant (Table 1) information from Installation
Guides A thru M.
MIN REVIEW
2021
ALL Update instruction to conform to FAA Order 8110.54A, Appendix A, Part
23, ICA Checklist;
6-1 Update Table 6-1, Eectivity, pg. 6-1 thru 6-3;
6-6 & 6-7 Update LAMP function jumper for clarication, steps 7 & 8 where
applicable. Add “locally manufactured jumper”;
6-16 Add Guide N for Jasco regulator replacement R1224J.

R1224 Regulator
Installation Instruction
24-30-01 12-1001
Page: iv Rev. M: 01 Dec. 2021
© 2021 - Hartzell Engine Technologies - All rights reserved
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R1224 Regulator
Installation Instruction
12-1001 24-30-01
Rev. M: 01 Dec. 2021 Page: v
© 2021 - Hartzell Engine Technologies - All rights reserved
AIRWORTHINESS LIMITATIONS ......................................................................................................... A-1
A.1 General Information ..................................................................................................................... A-1
A.2 Airworthiness Limitations Statement............................................................................................ A-1
A.3 Life Limits..................................................................................................................................... A-2
SECTION 1 -INTRODUCTION................................................................................................................1-1
1.1 General Information ......................................................................................................................1-1
1.2 General Specification (Instruction)................................................................................................1-2
1.3 Measurements ..............................................................................................................................1-2
1.4 Units of Measure...........................................................................................................................1-2
1.5 Abbreviations ................................................................................................................................1-3
1.6 Definitions .....................................................................................................................................1-4
1.7 Disposal ........................................................................................................................................1-4
1.8 Storage..........................................................................................................................................1-4
1.9 Serial number Identification ..........................................................................................................1-5
1.10 Warranties.....................................................................................................................................1-5
SECTION 2 -DESCRIPTION OF OPERATION ..................................................................................2-1
2.1 Description ....................................................................................................................................2-1
2.2 Basic Component Description.......................................................................................................2-1
2.3 Theory of Operation ......................................................................................................................2-1
SECTION 3 - TROUBLESHOOTING ........................................................................................................3-1
3.1 General .........................................................................................................................................3-1
3.2 Procedure......................................................................................................................................3-1
3.3 R1224 Regulator Troubleshooting ................................................................................................3-1
SECTION 4 - CHECK ..................................................................................................................................4-1
4.1 General .........................................................................................................................................4-1
4.2 Inspection Checks.........................................................................................................................4-1
SECTION 5 -TESTING ..............................................................................................................................5-1
5.1 General .........................................................................................................................................5-1
SECTION 6 - INSTALLATION....................................................................................................................6-1
6.1 Effectivity.......................................................................................................................................6-1
A. General ....................................................................................................................................6-1
6.2 Single Engine ...............................................................................................................................6-6
A. Installation................................................................................................................................6-6
6.3 Multi-Engine ..................................................................................................................................6-6
A. Installation................................................................................................................................6-6
TABLE OF CONTENTS

R1224 Regulator
Installation Instruction
24-30-01 12-1001
Page: vi Rev. M: 01 Dec. 2021
© 2021 - Hartzell Engine Technologies - All rights reserved
6.4 Regulator Installation Guide-A ..................................................................................................... 6-7
A. General ....................................................................................................................................6-7
6.5 Regulator Installation Guide-B ..................................................................................................... 6-7
A. General ....................................................................................................................................6-7
6.6 Regulator Installation Guide-C..................................................................................................... 6-8
A. General ....................................................................................................................................6-8
6.7 Regulator Installation Guide-D..................................................................................................... 6-8
A. General ....................................................................................................................................6-8
6.8 Regulator Installation Guide-E ..................................................................................................... 6-9
A. General ....................................................................................................................................6-9
6.9 Regulator Installation Guide-F .................................................................................................... 6-10
A. General ...................................................................................................................................6-10
6.10 Regulator Installation Guide-G.................................................................................................... 6-10
A. General ...................................................................................................................................6-10
6.11 Regulator Installation Guide-H.................................................................................................... 6-11
A. General ...................................................................................................................................6-11
6.12 Regulator Installation Guide-I ..................................................................................................... 6-12
A. Prepare the replacement regulator.........................................................................................6-12
B. Prepare the installation...........................................................................................................6-12
C. Replace the regulator .............................................................................................................6-12
6.13 Regulator Installation Guide-J..................................................................................................... 6-13
A. General ...................................................................................................................................6-13
B. Lamp Modification...................................................................................................................6-13
6.14 Regulator Installation Guide-K .................................................................................................... 6-13
A. Prepare the replacement regulators.......................................................................................6-13
B. Prepare the installation...........................................................................................................6-13
C. Replace the regulators ...........................................................................................................6-13
6.15 Regulator Installation Guide-L .................................................................................................... 6-14
A. Prepare the replacement regulator.........................................................................................6-14
B. Prepare the installation:..........................................................................................................6-14
C. Replace the regulator .............................................................................................................6-14
6.16 Regulator Installation Guide-M ................................................................................................... 6-15
A. General ...................................................................................................................................6-15
6.17 Regulator Installation Guide-N.................................................................................................... 6-16
A. General ...................................................................................................................................6-16
B. Prepare the replacement regulator.........................................................................................6-16
C. Replace the regulator .............................................................................................................6-16

R1224 Regulator
Installation Instruction
12-1001 24-30-01
Rev. M: 01 Dec. 2021 Page: vii
© 2021 - Hartzell Engine Technologies - All rights reserved
Thank you for purchasing a PlanePower* R1224 regulator. We encourage you to read this
instruction thoroughly. It contains a wealth of information about how to properly install and
maintain your regulator so that it may give you many years of safe and reliable service.
Should you have a question regarding your regulator that is not covered in this instruction,
Hartzell Engine Technologies Product Support is ready to assist you. We may be reached at
the following contact information:
Phone: +1.334.386.5400, option 2
Fax: +1.334.386.5450
Web: hartzell.aero/contact/
*PlanePower is a trademark of Hartzell Engine Technologies LLC
WARNING:
People who fly should recognize that there are various types of risks are involved
in this activity; and they should take all precautions to minimize them, since they
cannot be eliminated entirely. An electrical system failure could result in an
unplanned landing or even more severe consequences creating an unsafe condition
that may result in death, serious bodily injury, and/or substantial property damage.
It is essential that the components of the aircraft electical system be properly
maintained according to the recommended service procedures and monitored to
detect impending problems before they become serious. Any unusual operation
should be investigated and corrected, as it may be a warning of impending failure.

R1224 Regulator
Installation Instruction
12-1001 24-30-01
Rev. M: 01 Dec. 2021 Page: A-1
© 2021 - Hartzell Engine Technologies - All rights reserved
Revision Number Description of Revision
Airworthiness Limitation Revisions Log
AIRWORTHINESS LIMITATIONS
A.1 General Information
CAUTION:
THE AIRWORTHINESS LIMITATIONS HEREIN ARE THOSE MANDATED BY
HARTZELL ENGINE TECHNOLOGIES. THESE LIMITATIONS ARE THE MINIMUM
REQUIRED TO MEET CONTINUED AIRWORTHINESS BUT MAY BE SUPERSEDED
BY MORE STRINGENT REQUIREMENTS AS PUBLISHED BY THE FAA, AIRCRAFT,
ROTORCRAFT OR OTHER MANUFACTURERS THAT USE THESE COMPONENTS
IN THEIR APPLICATIONS. FAILURE TO OBSERVE THESE LIMITATIONS MAY
COMPROMISE THE COMPONENT OR THE APPLICATION IT IS USED IN.
A.2 Airworthiness Limitations Statement
A. The Airworthiness Limitations section is FAA accepted and species maintenance required under
§ 43.16 and § 91.403 of the Federal Aviation Regulations unless an alternative program has been
FAA approved.
AIRWORTHINESS
LIMITATIONS

R1224 Regulator
Installation Instruction
24-30-01 12-1001
Page: A-2 Rev. M: 01 Dec. 2021
© 2021 - Hartzell Engine Technologies - All rights reserved
A.3 Life Limits
A. The FAA establishes specic life limits for certain component parts Such limits require replacement
of the identied parts after a specied number of cycles or hours of use.
B. Additions of, or changes to, any life limit for alternator components will be noted in the Airworthiness
Limitation Revision Log.
C. Life Limits
(1) R1224 series regulators and their component parts affected by this instruction currently do
not have any life limited parts.
(2) There are no new (or additional) Airworthiness Limitation associated with this equipment.

SECTION 1 -INTRODUCTION
1.1 General Information
WARNING:
IMPROPER OR UNAUTHORIZED APPLICATIONS OF THE INFORMATION
CONTAINED IN THE INSTRUCTION MAY RENDER THE AIRCRAFT
OR THE COMPONENT UNAIRWORTHY AND RESULT IN LOSSES,
DAMAGES, OR INJURY TO THE USER.
DO NOT USE OBSOLETE OR OUTDATED INFORMATION. PERFORM
ALL INSPECTIONS OR WORK IN ACCORDANCE WITH THE MOST
RECENT REVISION OF THE APPLICABLE AIRCRAFT/ENGINE SERVICE
OR MAINTENANCE MANUAL. INFORMATION CONTAINED IN THESE
INSTRUCTIONS MAY BE SIGNIFICANTLY CHANGED FROM EARLIER
REVISIONS. USE OF OBSOLETE INFORMATION MAY CREATE AN
UNSAFE CONDITION THAT MAY RESULT IN DEATH, SERIOUS BODILY
INJURY, AND/OR SUBSTANTIAL PROPERTY DAMAGE.
The accuracy and applicability of this instruction has not been veried for any assembly, component or part
not manufactured by Hartzell Engine Technologies LLC (HET). Any use of the instruction for other than its
intended or implied purpose is prohibited. The use of the instruction for the purpose of performing any
installation, maintenance, replacement, adjustment, or inspection of any assembly, component or part not
manufactured by HET is not approved, endorsed, or sanctioned by HET.
This instruction has been approved by Hartzell Engine Technologies LLC as the proper methods and
procedures that FAA or other airworthiness authority Certicated Repair Stations and A/P Mechanics
should use in the inspection and maintenance of Hartzell Engine Technologies LLC regulators.
No liability will be assumed by Hartzell Engine Technologies LLC for actual, consequential, incidental or
other types of damages directly or indirectly resulting from the unauthorized use of this instruction for other
than its stated purposes.
The liability for use of the authorized data herein for the maintenance, or return to service is limited to
the specic terms and conditions stated under the applicable Limited Warranty in eect for each piece
part, component, assembly or whole unit sold by HET.
Because of the numerous modications, Supplemental Type Certicates (STC), Parts Manufacturing
Approvals (PMA), or Form 337 Field Approvals that may apply, it is the responsibility of the repairman,
mechanic or maintenance facility to determine the proper engine or aircraft application of this regulator
assembly. Please refer to the appropriate aircraft Type Certicate (TC), Supplemental Type Certicate
(STC), aircraft equipment list, maintenance manuals, and/or Log Book entries for determination.
When performing installation, maintenance, replacement, adjustment, or inspection of any HET assembly,
component or part, it is imperative that the latest revision of this instruction or other product support
document be referenced. Reference the HET website to be sure you have the latest revision before
performing any work. (http://www.hartzell.aero/maintenance-manuals/)
All reasonable attempts were made to make this instruction as complete and accurate as possible. If you
have any questions, comments, corrections or require clarication of any information contained herein,
please write to Hartzell Engine Technologies LLC, 2900 Selma Highway, Montgomery, Alabama, 36108
USA. TEL +1.334.386.5400, FAX +1.334.386.5410, or http://hartzell.aero/contact/.
R1224 Regulator
Installation Instruction
12-1001 24-30-01
Rev. M: 01 Dec. 2021 Page: 1-1
© 2021 - Hartzell Engine Technologies - All rights reserved

1.2 General Specification (Instruction)
A. This instruction is written in the English language and follows guidelines outlined in ATA 100 standards.
Principle units of measure used in this instruction are U.S. units with International System of Units (SI) in
parentheses.
B. The R1224, R1224B, and R1224J regulator models are considered herein.
C. All aircraft, rotorcraft, or engine applications are limited to the holder of the TC, STC, PMA or TSO and only at
the date of that document publication or revision.
D. Only approved, competent persons with the necessary skills may do maintenance tasks described in this
instruction. This may include a certied pilot doing “preventative maintenance” as dened in FAR 43, Appendix
A, paragraph C with guidance from AC 43-13-1B and AC 43-13-2B or latest change.
E. This instruction describes maintenance on components as they are installed on aircraft and tasks that should
be accomplished in a properly equipped service facility.
F. Maintenance tasks and subtasks are referenced in the instruction but will have no specic identication
numbers.
G. The instruction contains: Description of operation, Troubleshooting, Instruction for Continued Airworthiness
(ICA) and Maintenance information along with part numbers required for basic maintenance tasks.
H. Changes and updates to this instruction can be found at www.PlanePower.aero*. Revisions will be tracked and
recorded in the Record of Revisions section of this document.
* Plane-Power is a trademark of Hartzell Engine Technologies LLC.
1.3 Measurements
The measurements given in this instruction are taken from original manufacturing drawings.
1.4 Units of Measure
A. SI Units
A Ampere
A ∙ h Ampere hours
g Gram
N Newton
N ∙ m Newton meter
V Volt
°C Degree Celsius
Ω Ohm
W Watt
Hz Hertz
m Meter
cm Centimeter
kg Kilogram
R1224 Regulator
Installation Instruction
24-30-01 12-1001
Page: 1-2 Rev. M: 01 Dec. 2021
© 2021 - Hartzell Engine Technologies - All rights reserved

B. U.S. Units
ft Foot
in Inch
lb Pound
lbf ∙ in Pound-force inch
lbf ∙ ft Pound-force foot
0F Degree Fahrenheit
C. Multiplying Prexes
μ Micro
m Milli
k Kilo
M Mega
p Pico
1.5 Abbreviations
A. The abbreviations given below are used in this instruction: (upper or lower case)
AC Advisory Circular
AFM Aircraft Flight Manual
ALT Alternator
ATA Air Transport Association of America
CB Circuit Breaker
DIA Diameter
FAA Federal Aviation Administration (USA)
FIG. Figure
GAMA General Aviation Manufacturers Association
HET Hartzell Engine Technologies LLC
MAX Maximum
MFR Manufacturer
MIN Minimum
NO. Number
N/A Not Applicable
P/N Part Number
PARA. Paragraph
POH Pilots Operating Handbook
REF. Refer To
TS Troubleshooting
R1224 Regulator
Installation Instruction
12-1001 24-30-01
Rev. M: 01 Dec. 2021 Page: 1-3
© 2021 - Hartzell Engine Technologies - All rights reserved

1.6 Definitions
A. This paragraph denes the warnings and notications used in this instruction. WARNINGS place critical
attention to use of tools, materials, procedures, or limitations, which must be followed without deviation to
avoid injury to the technician or other persons. CAUTIONS place immediate attention to use of tools and
procedures which must be followed to avoid injury, damage to equipment and/or facilities. Notes call attention
to procedures which make the job easier.
B. The following are basic denitions of the terms used herein: (as related to this instruction)
ALTERNATOR: The complete unit which transforms rotational energy from a powerplant
into electrical energy . At a given voltage, produces alternating current (AC) which is
converted to direct current (DC).
CONTINUITY: The continuous path for the ow of current in an electrical circuit.
EMI: Electro Magnetic Interference. A disturbance in the radio-frequency spectrum that is generated by an
external source that aects electrical devices or circuits by electromagnetic induction, electrostatic coupling, or
conduction.
OPEN: Electrical term for a complete disruption of a conductive path in an electrical circuit. Will read innite
resistance.
VOLTAGE REGULATOR: The voltage regulator controls system voltage by controlling the electrical circuit
(called the eld circuit) that energizes the electromagnet of the alternator rotor.
ROTOR: Rotating electro magnet used to create a magnetic eld.
TERMINALS: Studs, screws or other devices that provide connections for electrical power.
1.7 Disposal
A. Disposal of unairworthy parts and assemblies as well as required replacement parts should be as follows:
Rejected parts should be tagged and scrapped per FAA requirements. Any part deemed unairworthy must be
rendered unusable prior to discard. Rectiers and PCB components may be considered hazardous waste and
should be discarded whole through your local hazardous waste management system.
1.8 Storage
A. If unused, the regulator has no special preservation procedures and should be stored in its original packaging
in a clean and dry environment. No storage limits are applicable if stored properly.
B. If the regulator is installed and has been in service, follow the recommendations of the engine and aircraft
manufacturer regarding storage and preservation.
R1224 Regulator
Installation Instruction
24-30-01 12-1001
Page: 1-4 Rev. M: 01 Dec. 2021
© 2021 - Hartzell Engine Technologies - All rights reserved

1.9 Serial number Identification
HET H- V 05 001
Year Code
Month Code
Batch Code
Example above: 2021, May, rst unit of the month (batch). The year code advances one letter in alphabetical
order for each succeeding year.
1.10 Warranties
A. Hartzell Engine Technologies LLC (HET) oers a Limited warranty with each new, overhauled, or rebuilt regulator
assembly or component (parts) it sells through it’s distribution system. NO expressed or implied warranty exists
when repairing, overhauling, or rebuilding any assembly or component using this instruction except as it may apply
to any new HET replacement part purchased. If you suspect that any warranty applies to the regulator assembly,
it must be returned through an authorized HET distributor in a manner prescribed by that specic distributor. The
aected regulator must be received by the factory fully assembled and not altered in any way for disposition by
the HET warranty department. (Warranty shall be denied for any regulator received altered, modified, or
disassembled.)
B. The HET Limited warranty policy in aect for your voltage regulator was delivered with the unit at the time of
purchase. (As the Warranty policy is revised from time to time, you must check the policy delivered with your unit
for specic terms and conditions should a warranty condition occur. If needed for reference, obtain the most current
policy from the authorized HET distributor nearest you -or- visit our website at www.hartzell.aero.
R1224 Regulator
Installation Instruction
12-1001 24-30-01
Rev. M: 01 Dec. 2021 Page: 1-5
© 2021 - Hartzell Engine Technologies - All rights reserved

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R1224 Regulator
Installation Instruction
24-30-01 12-1001
Page: 1-6 Rev. M: 01 Dec. 2021
© 2021 - Hartzell Engine Technologies - All rights reserved

SECTION 2 -DESCRIPTION OF OPERATION
2.1 Description
A. The Plane Power R1224 Voltage Regulator is a solid-state voltage regulator with over-voltage protection, eld
short (over current) protection, and reverse battery protection. The R1224 regulator is designed to be set up for
14 or 28 volt congurations.
2.2 Basic Component Description
Refer to Figure 2-1
A. Connection Strip
(1) GRND - Aircraft ground
(2) FLD - Connects to one of the two alternator rotor brushes to engergize the rotor allowing the alternator to
generate power.
(3) ENABLE - Connects to the aircraft bus to supply electrical power to the regulator. Overvoltage
protection works by shorting the Enable pin to ground, tripping the the circuit breaker connected in
series.
(4) AUX - Senses the functional voltage of the alternator in order to trigger the LAMP circuit when a fault is
detected.
(5) LAMP - Will illuminate an indicator lamp in the case that a fault is detected by the regulator. The LAMP
circuit is rated to sink a maximum of 100mA of current.
(6) OUT - Used to control a second regulator in a dual alternator configuration.
(7) IN - Connection from the primary regulator (OUT) in a dual alternator configuration. If the signal from the
primary regulator is lost, the secondary regulator will resume independent operation.
(8) SENSE - The R1224 regulator will apply power to the alternator’s rotor when voltage at the SENSE
terminal is below the regulator set point.
2.3 Theory of Operation
A. Field-drive: The regulator senses the voltage at the SENSE terminal and provides power to the alternator
rotor. Energizing the rotor allows the alternator to generate power.
B. Overvoltage Protection: In the event that the voltage supplied to the ENABLE pin exceeds the normal
operating voltage range the regulator will trigger a circuit breaker connected in series with the ENABLE pin.
The regulator will connect the ENABLE pin to the GRND pin, bypassing the field circuit and causing the circuit
breaker to trip due to an over current event.
C. Lamp Circuit: The regulator will complete the circuit between the LAMP terminal and GRND when either a
high or low voltage is detected at the AUX terminal. Note this circuit does not function if the regulator is not
powered.
D. Primary/Secondary Operation:
(1) In a dual alternator configuration, one alternator/regulator is designated as “Primary” and one alternator/
regulator is designated as “Secondary”. The voltage control circuit of the “Primary” R1224 regulator
controls both regulators. If the Primary regulator fails, the “Secondary” alternator/regulator will operated
independently from the “Primary” alternator/regulator.
R1224 Regulator
Installation Instruction
12-1001 24-30-01
Rev. M: 01 Dec. 2021 Page: 2-1
© 2021 - Hartzell Engine Technologies - All rights reserved

Figure 2-1 - Typical R1124 Wiring Diagram
5A Typical
CB
Alternator
CB
R1224 Regulator
Installation Instruction
24-30-01 12-1001
Page: 2-2 Rev. M: 01 Dec. 2021
© 2021 - Hartzell Engine Technologies - All rights reserved

R1224 Regulator
Installation Instruction
12-1001 24-30-01
Rev. M: 01 Dec. 2021 Page: 3-1
© 2021 - Hartzell Engine Technologies - All rights reserved
SECTION 3 - TROUBLESHOOTING
3.1 General
A. In the event of malfunction in electrical power, it should not be assumed to be a regulator fault before
employing proper troubleshooting procedures. The overall objective of troubleshooting is to nd the cause
of trouble and take corrective action to prevent a recurrence.
B. This section provides general troubleshooting procedures for the R1224 regulator assembly for
unscheduled maintenance. It gives procedures to follow to determine the best course of action prior to
replacement.
3.2 Procedure
WARNING
WHILE TROUBLESHOOTING THE REGULATOR, GREAT CARE AND CAUTION MUST
BE TAKEN TO AVOID HAZARDOUS SITUATIONS. THE REGULATOR POSSESSES A
HIGH ELECTRICAL CURRENT OUTPUT AND PRESENTS AN ELECTRICAL SHOCK
HAZARD THAT CAN RESULT IN SERIOUS INJURY IF PROCEDURES IN THIS MANUAL
OR THE AIRCRAFT/ROTORCRAFT SERVICE MANUALS ARE NOT FOLLOWED.
NOTE:
It is required to reference the aircraft or rotorcraft AFM or POH as well as the applicable service or
maintenance manual as required.
3.3 R1224 Regulator Troubleshooting
A. Refer to Table 3.1 troubleshooting guide to test the R1224 regulator.
B. Perform all tests under the following conditions:
(1) Alternator switch - ON
(2) Master switch - ON
(3) Engine - OFF
(4) Magnetos - OFF or Grounded
C. Consideration During Tests
(1) Voltage drop of 1.5V MAX at all points except across the voltage regulator.
(2) Voltage drop of .5V MAX across regulator is acceptable.
(3) MAX resistance of .2Ωat ground points across switches and conductors.

R1224 Regulator
Installation Instruction
24-30-01 12-1001
Page: 3-2 Rev. M: 01 Dec. 2021
© 2021 - Hartzell Engine Technologies - All rights reserved
Table 3.1 - R1224 Regulator Troubleshooting
FIELD/
ALTERNATOR CB
1 AMP FUSE/CB
Call or email TECH SUPPORT for further instructions
Phone: +1.334.386.5400, option 2
Verify the R1224 Regulator is wired per applicable
guide in Section 6. If no guide is present for specic
application, use the diagram found on this page.
R1224 TS Diagram (Typical)
Refer to seciton 6 of this document

R1224 Regulator
Installation Instruction
12-1001 24-30-01
Rev. M: 01 Dec. 2021 Page: 4-1
© 2021 - Hartzell Engine Technologies - All rights reserved
SECTION 4 - CHECK
4.1 General
A. This section denes the various checks and inspections needed to assure reliable and safe
operation of the alternator while in service. They are listed in hours time in service (TIS) or in
calendar time, whichever is applicable and are the rst to occur when oered a choice. Some
maintenance is one time initial and others are recurring.
B. HET recommended maintenance and checks including TIS may be superseded by the aircraft or
engine manufacturer’s established time limits and schedules based on experience and/or unique
requirements under engine or airframe Type Certicate.
4.2 Inspection Checks
100 Hours TIS & each 100 hours thereafter. (or each annual/event, the first to occur)
(1) Check voltage level output. If the voltage level does not meet the Aircraft Manufacturer’s
requirement, adjust the voltage as per section 6-1 step 9.
(2) Inspect Regulator and wiring for secure electrical connections and physical connection to the air
frame.
(3) Check connection between terminal 1 (GND) and airframe ground is found to be less than 0.1
OHM.
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