AC 20-143

Advisory circular · Installation, Inspection, and Maintenance of Controls for General Aviation Reciprocating Aircraft Engines

Approved
June 6, 2000
Last reviewed
March 22, 2017
Family
AC 20-143 · 1 version
14 CFR parts
21, 23, 33, 35

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed October 23, 2026.

Show pages 1–12
Page 13OCROpen in PDF

9. Appendix 1 provides supplemental illustrations for inspection, maintenance, and installation of engine lever and cable controls. These figures are for guidance only and may not represent actual installations.

S/ Marvin Nuss for Michael Gallagher Manager, Small Airplane Directorate Aircraft Certification Service 13

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Appendix 1 APPENDIX 1

SUPPLEMENTAL ILLUSTRATIONS FIGURE 1. INSTRUMENT PANEL CONTROL CONFIGURATION

FLEXIBLE

CONDUIT Z RIGID

CONDUIT STAKE KNOB

INSTRUMENT PANEL

FRICTION

JAMB LOCK NUT NOTE: For guidance information only. May not represent actual installations.

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Appendix 1 FIGURE 2. SWIVEL (SWAGED) BALL JOINT INSPECTION CONFIGURATION

CONTROL ASSEMBLY

SWIVEL BALL JOINT

DUST SEAL PAD .050 MOVEMENT PLUNGER GUIDE— TYPICAL NOTE: For guidance information only. May not represent actual installations.

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Appendix 1 FIGURE 3. CONTROL CABLE ROUTING FROM HIGH HEAT SOURCES

ALTERNATE AIR

CONTROL CABLE

TIES LACING MIXTURE CONTROL CABLE

PROPELLER

CONTROL CABLE AND

FIRESLEEVE

COWL FLAP

CONTROL THROTTLE

CABLE CONTROL CABLE NOTE: For guidance information only. May not represent actual installations.

Page 17OCROpen in PDF

Appendix 1 FIGURE 4. CONTROL CABLE ROUTING FROM HIGH HEAT SOURCES

PROPELLER

AND CONTROL A CONTROL CABLE MIXTURE

FIRE SLEEVEJ CLAMPS WITH LINK NOTE: For guidance information only. May not represent actual installations.

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Appendix 1 FIGURE 5. CONTROL ROUTING IN ENGINE COMPARTMENT

CONTROL ASSEMBLY

CARBURETOR HEAT -CARBURETOR BOLT MUST PIVOT FREELY

CLAMP A *-AIR BOX

SECURE ON

CABLE HOUSING

O MAXIMUM BEND

RADIUS POSSIBLE NOTE: For guidance information only. May not represent actual installations.

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Appendix 1 FIGURE 6. CONTROL CABLE BEND RADI

PREFERRED ROUTING

OF MIXTURE CONTROL

UNDESIRABLE

ROUTING OF

TO MIXTURE

INSTRUMENT CONTROL PANEL

UNDESIRABLE ROUTING OF

THROTTLE CONTROL

PREFERRED ROUTING OF MOUNTING

THROTTLE CONTROL

BRACKET

FIREWALL CLAMP NOTE: For guidance information only. May not represent actual installations.

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Appendix 1 FIGURE 7. CONTROL SYSTEM OVERVIEW

SWIVEL HOUSING SLEEVE

CONTROL WIRE ASSEMBLY FRICTION SPRING & BALL

WASHER- MIXTURE

CONTROL

- NUT

WASHER- COTTER PIN

OCONTROL HOUSING

A CABLE CLAMP- CARBURETOR 7 CABLE CLAMP INSTRUMENT _PANEL — FACEPLATE

INSTRUMENT

CONTROL PANEL

SUPPORT KNOB

FIREWALL SPACER

MAXIMUM BEND

RADIUS POSSIBLE

SECURE ON

CABLE HOUSING NOTE: For guidance information only. May not represent actual installations.

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Appendix 1 FIGURE 8. CONTROL CABLE ROUTING IN HIGH

HEAT SOURCE AREAS

MIXTURE

CONTROL SHIELD COWL FLAP

CABLE CONTROL CABLE _ BRACKET

FIRE SLEEVE

ALL FOUR

CONTROL CABLES ~ CLAMP

THROTTLE PROPELLER

CONTROL CONTROL

CABLE CABLE NOTE: For guidance information only. May not represent actual installations.

Page 22OCROpen in PDF

Appendix 1 FIGURE 9. CONTROL CABLE SECURITY

BRACKET SHIELD CLAMP-

ALTERNATE AIR-

CONTROL CABLE

LACING TIE-S NOTE: For guidance information only. May not represent actual installations.