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 .2Ω at ground points across switches and conductors.
To Next Page
Loading...