AC 20-105C

Historical

Advisory circular · Reciprocating Engine Power-Loss Accident Prevention and Trend Monitoring

A newer version is currentThis is a historical version. AC 20-105C Ed Update is the version in force, approved July 2, 2024.
Approved
December 18, 2023
Last reviewed
December 19, 2023
Cancels
AC20-105B
Family
AC 20-105 · 3 versions
Revision
C
14 CFR parts
91, 121, 135
14 CFR sections
§ 135.421

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed November 22, 2025.

Show pages 1–12

Appendix B B-2 AREA #2 CYLINDER/PISTON ASSEMBLIES:

INSP. 1 INSP. 2 INSP. 3 INSP. 4 INSP. 5 INSP. 6 INSP. 7 INSP. 8 CHT EGT#2 COMPRESSION:

INSP. 1 INSP. 2 INSP. 3 INSP. 4 INSP. 5 INSP. 6 INSP. 7 INSP. 8 #1 #2 #3 #4 #5 #6 #7 #8 DATE SPARK PLUG REPLACED @ ENGINE HOURS

Appendix B B-3 SPARK PLUG CONDITION:

1 = Good 2 = Worn 3 = Oil Fouled 4 = Carbon Fouled 5 = Lead Fouled 6 = Damaged INSP. 1 INSP. 2 INSP. 3 INSP. 4 INSP. 5 INSP.6 INSP.7 INSP. 8 #1 CYLINDER - TOP BOTTOM #2 CYLINDER - TOP BOTTOM #3 CYLINDER - TOP BOTTOM #4 CYLINDER - TOP BOTTOM #5 CYLINDER - TOP BOTTOM #6 CYLINDER - TOP BOTTOM #7 CYLINDER - TOP BOTTOM #8 CYLINDER - TOP BOTTOM

Appendix B B-4 AREA #3 ACCESSORIES:

INSP. 1 INSP. 2 INSP. 3 INSP. 4 INSP. 5 INSP. 6 INSP. 7 INSP. 8

FUEL CONSUMPTION GALLONS PER HOUR @ CRUISE INSP. 1 INSP. 2 INSP. 3 INSP. 4 INSP. 5 INSP. 6 INSP. 7 INSP. 8

RT LT RT LT RT LT RT LT RT LT RT LT RT LT RT LT

MAGNETO DROP INSP. 1 INSP. 2 INSP. 3 INSP. 4 INSP. 5 INSP. 6 INSP. 7 INSP. 8 VACUUM GAUGE @ 1500/1700 RPM ELECTRICAL VOLT/AMP @ 2100 RPM INSP. 1 INSP. 2 INSP. 3 INSP. 4 INSP. 5 INSP. 6 INSP. 7 INSP. 8

AIR FILTER CONDITION

DATE AIR FILTER REPLACED

Advisory Circular Feedback Form If you find an error in this AC, have recommendations for improving it, or have suggestions for new items/subjects to be added, you may let us know by contacting the Flight Standards Directives Management Officer at 9-AWA-AFB-120-Directives@faa.gov.

Subject: AC-20-105C, Reciprocating Engine Power-Loss Accident Prevention and Trend Monitoring Date: _____________________ Please check all appropriate line items:

An e rror ( proc edural or typographical) has been noted in paragraph ____________ on page _______.

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