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KMC PUBLICATION NO. 1405
KMC
KELLY MANUFACTURING COMPANY
RCA22 SERIES
VACUUM HORIZON GYRO
INSTALLATION/OPERATION GUIDE
RCA22-7
RCA22-11
RCA22-7F
RCA22-11F
KELLY MANUFACTURING COMPANY
(316) 265-6868
555 SOUTH TOPEKA
FAX (316) 265-6687
WICHITA, KS 67202
KELLYMFG.COM
Rev B May 5, 2025
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Summary of Contents for KMC Controls rc allen RCA22 Series
- Page 1 KMC PUBLICATION NO. 1405 KELLY MANUFACTURING COMPANY RCA22 SERIES VACUUM HORIZON GYRO INSTALLATION/OPERATION GUIDE RCA22-7 RCA22-11 RCA22-7F RCA22-11F KELLY MANUFACTURING COMPANY (316) 265-6868 555 SOUTH TOPEKA FAX (316) 265-6687 WICHITA, KS 67202 KELLYMFG.COM Rev B May 5, 2025...
- Page 3 RCA22 Series Installation/Operation Guide KELLY MANUFACTURING COMPANY TABLE OF CONTENTS PAGE SECTION 1 INSTRUMENT DESCRIPTION 1.1 General Description ..........2 1.2 Physical Description ..........2 1.3 Display Features ..........4 1.4 Options and Configurations ......... 4 SECTION 2 INSTALLATION 2.1 General Information ..........5 2.2 Handling ..............
- Page 4 RCA22 Series Installation/Operation Guide KELLY MANUFACTURING COMPANY SECTION 1: INSTRUMENT DESCRIPTION 1.1 GENERAL DESCRIPTION A vacuum attitude indicator, also known as a horizon gyro or artificial 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 instrument for flight in instrument meteorological conditions. Attitude indicators also have significant applications under visual flight rules.
- Page 5 RCA22 Series Installation/Operation Guide KELLY MANUFACTURING COMPANY 1/4-18 NPTF NYLON FITTING 6-32 UNC 2B Ø 3.125 (4 PL) VACUUM PORT 3.38 ( TYP ) 0.12 VACUUM GAGE 1/8-27 NPTF 4.70 NYLON FITTING 6.25 MAX REAR VIEW RCA22-7 SHOWN (TYPICAL) UNLIGHTED (TYPICAL) INSTALL LAMP TRAY AS SHOWN, WIRES EXIT THIS END...
- Page 6 RCA22 Series Installation/Operation Guide KELLY MANUFACTURING COMPANY 1.3 DISPLAY FEATURES See Figure 1.2 below for typical display features. Colors and graphics vary with each model (RCA22-7 shown). 4 ROLL DIAL 3 ROLL POINTER 2 PITCH DIAL 5 HORIZON LINE 1 SYMBOLIC AIRPLANE 6 SYMBOLIC AIRPLANE...
- Page 7 RCA22 Series Installation/Operation Guide KELLY MANUFACTURING COMPANY SECTION 2, INSTALLATION 2.1 GENERAL INFORMATION The conditions and tests 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 specific type or class of aircraft to determine that the aircraft installation condi- tions are within the TSO standards. TSO articles must have a separate approval installation in an aircraft. Installation must only be performed under 14CFR Part 43 or the applicable airworthiness requirements.
- Page 8 RCA22 Series Installation/Operation Guide KELLY MANUFACTURING COMPANY SECTION 3, OPERATION 3.1 PRE-FLIGHT PROCEDURES During pre-flight procedures, the attitude gyro must be provided with adequate vacuum pressure under normal vibration conditions (engine running). Allow a minimum of three minutes for the gyro to settle to true level. Adjust the “Symbolic Airplane” to visually align the “wings” with the horizon line. This adjustment compensates for viewing parallax error (pilot’s viewing angle). 3.2 IN-FLIGHT PROCEDURES You may also adjust the Symbolic Airplane indicator at any time. 3.3 FLIGHT LIMITATIONS It is not recommended to perform aerobatic maneuvers while using the RCA22 Series Horizon Gyro.
- Page 9 RCA22 Series Installation/Operation Guide KELLY MANUFACTURING COMPANY SECTION 4, SLIP INDICATOR INSTALLATION 4.1 LEGACY INSTRUMENTS P/N 444-0010-01 is used for all new lighted RCA22 Series Horizon Gyros. When ordering to retrofit an older instrument, note that instruments manufactured before March 4, 2011 have a different screw spacing and use P/N 444-0011-01. Refer to illustration below for proper part number selection. 0.394 0.812 0.788 1.624 P/N 444-0010-01 P/N 444-0011-01 USED ON ALL LIGHTED RCA22 SERIES USED ON ALL LIGHTED RCA22 SERIES WITH MANUFACTURE DATE AFTER 03/04/2011 WITH MANUFACTURE DATE BEFORE 03/04/2011...
- Page 10 RCA22 Series Installation/Operation Guide KELLY MANUFACTURING COMPANY Frequently Asked Questions How long should my gyro last? There are many factors that determine the life of a gyro. We have seen gyros with everything from corrosion from sea air to excessive bearing wear from rough landings. Ideally you should receive hundreds of hours of use, but it is completely dependent on how the unit is treated and the environment in which it is used.
- Page 11 RCA22 Series Installation/Operation Guide KELLY MANUFACTURING COMPANY APPENDIX A Instructions for Continued Airworthiness Document Number: ICA19.002 Rev A Equipment/Model Number: RCA22 series Equipment Description: Vacuum Horizon Indicator 1. Description This document describes the necessary maintenance requirements and instructions necessary to ensure the continued airworthiness of aircraft/rotorcraft with the RCA22 series Vacuum Horizon Indicators installed.
- Page 12 KMC PUBLICATION NO. 1405 KELLY MANUFACTURING COMPANY 555 S. TOPEKA WICHITA, KANSAS 67202...
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