---
description: Repair
---

# Main Driveshaft

## Preliminary requirements

### Consumables

<table data-full-width="false"><thead><tr><th>Name</th><th>Identification/References</th></tr></thead><tbody><tr><td>Zinc chromate primer</td><td><a href="https://bellhelicopter.net/tp/#/C-201">C-201</a></td></tr><tr><td>Polymer coating</td><td><a href="https://bellhelicopter.net/tp/#/C-248">C-248</a></td></tr><tr><td>Abrasive cloth or paper</td><td><a href="https://bellhelicopter.net/tp/#/C-406">C-406</a></td></tr></tbody></table>

## Procedure

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Minimize the removal of the protective layer during the repair.
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1. Use aluminum [Abrasive cloth or paper](#consumables) to remove the corrosion and damage. Do not go more than damage limits.

<div><figure><img src="https://1136328444-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FvVxBCb9tR1gpjsH2Apu7%2Fuploads%2FhbZrP1Va61uOW2AmmzlQ%2Fimage.png?alt=media&#x26;token=d4416454-980a-4e45-b315-75d14ab1e3c8" alt=""><figcaption><p>Main driveshaft - Permitted damage</p></figcaption></figure> <figure><img src="https://1136328444-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FvVxBCb9tR1gpjsH2Apu7%2Fuploads%2Fq2Qpa4Utz63UOjk3BT7Z%2Fimage.png?alt=media&#x26;token=3672faa9-97d3-4fb7-be1d-2dd39a8c9b06" alt=""><figcaption><p>Main driveshaft - Permitted damage Notes</p></figcaption></figure></div>

1. Apply a layer of [Zinc chromate primer](#consumables) to the protective layer.
2. Apply a top layer of [Polymer coating](#consumables). You can apply the polymer coating with the standard spray, brush or swab. The top layer must be cured in an oven at 300°F (149°C) for 15 minutes.
