About this document

APU 131-9A White Smoke Troubleshooting by Mark Thompson is a document available to read on EtoBox.

This document provides information about white smoke observed from the exhaust of Honeywell APU 131-9A units upon shutdown. It describes the root cause as being coked oil deposits obstructing the gearbox vent tube, outlines investigation and mitigation steps, and recommends procedures to clean the vent tube as an interim solution before replacing the entire APU.

Author

Mark Thompson

Language

EN