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Service bulletin WI20-011

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10177653
Published by NHTSA2020-07-28
Manufacturer's numberWI20-011
Manufacturer's date2020-07-20
NHTSA componentEQUIPMENT; ENGINE AND ENGINE COOLING

NHTSA's summary

Warranty Information Letter for Detroit and TBB Parchment Format Update. In the continuing effort to standardize across brands, DTNA is pleased to announce that Detroit Diesel Corporation (Detroit) and Thomas Built Bus (TBB) parchments will be transitioned to the format used for Freightliner, Freightliner Custom Chassis Corporation (FCCC), and Western Star. DTNA's goal is to improve and align documentation but individual coverages have not changed. Updated parchments, also known as coverage sheets, will be published on a rolling basis.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine, Equipment and accessories

Vehicles listed
THOMAS BUILT BUSES MINOTOUR2010 to 2021
THOMAS BUILT BUSES SAF-T-LINER C22010 to 2021
THOMAS BUILT BUSES SAF-T-LINER EFX2010 to 2021
THOMAS BUILT BUSES SAF-T-LINER HDX2010 to 2021

Listing a model year does not mean every vehicle of it is concerned: the document says which.