# General Information

## Use of the Component Restoration (Overhaul) Guide

It is intended that the Component Restoration (Overhaul) section provide a breakdown of the repair and overhaul of the **BELL** 505 components. It is designed to aid persons enrolled in a formal course of instruction, as well as the individual who is studying on his or her own.

This guide is not intended to replace, substitute for, or supersede official regulations or the manufacturer’s instructions.

The [505 Component Maintenance Manual (CMM)](https://bellhelicopter.net/tp/ietm/505/PMC-505-97499-05000-00/DMC-505-A-00-75-00-00A-001A-A?tocView=manual\&figureView=figure) provides all the procedures and data necessary to restore the **BELL** 505 components. The instructions provided in the **505-CMM** and those modified either by [Alert Service Bulletins (ASB)](https://bellhelicopter.net/tp/toc/505/ASB) issued by **BELL**, or by Airworthiness Directives (AD) issued by the local Aviation Authority, shall be strictly followed.

## Component Restoration (Overhaul) Schedule

The manufacture recommends to restore (overhaul) the following components at specified intervals:

<table data-column-title-hidden data-view="cards"><thead><tr><th align="center">Nomenclature</th><th align="center">Restoration (Overhaul) Interval</th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td align="center">Main rotor hub assembly</td><td align="center">2400 flight hours</td><td><a href="main-rotor-hub-assembly">main-rotor-hub-assembly</a></td></tr><tr><td align="center">Swashplate and support assembly</td><td align="center">4800 flight hours</td><td><a href="swashplate-and-support-assembly">swashplate-and-support-assembly</a></td></tr><tr><td align="center">Mast assembly</td><td align="center">3000 flight hours</td><td><a href="mast-assembly">mast-assembly</a></td></tr><tr><td align="center">Transmission assembly</td><td align="center">4500 flight hours</td><td><a href="transmission-assembly">transmission-assembly</a></td></tr><tr><td align="center">Freewheel assembly</td><td align="center">3000 flight hours</td><td><a href="freewheel-assembly">freewheel-assembly</a></td></tr><tr><td align="center">Tail rotor hub assembly</td><td align="center">2500 flight hours</td><td><a href="tail-rotor-hub-assembly">tail-rotor-hub-assembly</a></td></tr><tr><td align="center">Tail rotor gearbox</td><td align="center">6000 flight hours</td><td><a href="tail-rotor-gearbox">tail-rotor-gearbox</a></td></tr></tbody></table>
