Reduction of Electrical System Failures Following Engine Starting
FAA Advisory Circular AC 91-55 — Reduction of Electrical System Failures Following Engine Starting. Guidance on general operating and flight rules.
About this document
AC 91-55, Reduction of Electrical System Failures Following Engine Starting, is an FAA advisory circular providing guidance related to general operating and flight rules. Advisory circulars are the FAA's non-regulatory method of explaining how to comply with the regulations and describing acceptable means, methods, and practices; they are not themselves binding but are widely relied upon in training and operations.
This document sets out the FAA's recommended approach to the subject of reduction of electrical system failures following engine starting. Read it alongside the applicable sections of 14 CFR, which state the binding requirements.
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Take a free practice test →AC-91-55 is an official FAA publication in the public domain. We host a copy so you can read it in-browser; always confirm you are reading the current edition on faa.gov. The description above is an original summary and is a study aid, not a substitute for the document or the regulations.