# 100 flight hours/6 months inspection

## Preliminary requirements

### Required conditions

<table><thead><tr><th>Required condition</th><th data-type="content-ref">Procedure/Data</th></tr></thead><tbody><tr><td>Remove the right transmission fairing (432BR).</td><td></td></tr><tr><td>Remove the left transmission fairing (432AL).</td><td></td></tr><tr><td>Remove the forward engine cowling (441AT).</td><td></td></tr></tbody></table>

### Consumables, materials and expendables

| Nomenclature         | Identification No. | Qty |
| -------------------- | ------------------ | --- |
| Clean cloth          | C-516              | AR  |
| Dry-cleaning solvent | C-304              | AR  |

### Safety conditions

{% hint style="danger" %}
DRIVESHAFT ASSEMBLY IS NOT TO BE TAKEN APART AND FASTENERS ARE NOT TO BE DISTURBED. DISASSEMBLY OR DISTURBING FASTENERS IN CAUSE FOR REPLACEMENT.
{% endhint %}

{% hint style="danger" %}
MAKE SURE YOU OBEY ALL OF THE SAFETY PRECAUTIONS WHEN YOU USE SOLVENTS. FAILURE TO DO SO MAY RESULT IN INJURY TO PERSONS AND/OR DAMAGE TO COMPONENTS.
{% endhint %}

{% hint style="warning" %}
DO NOT ALLOW SOLVENT TO MAKE CONTACT WITH PARTS MADE OF ELASTOMERIC MATERIAL OR DAMAGE WILL OCCUR.
{% endhint %}

## Procedure

### Do a detailed inspection of the main driveshaft as follows:

1. Clean the main driveshaft with a clean cloth (C-516) moistened with drycleaning solvent (C-304).
2. Examine the main driveshaft for surface damage (dents, nicks, scratches, tool marks, and cracks).
3. If there is damage to the main driveshaft, refer to BHT-505-MM for permitted damage and/or contact Product Support Engineering (PSE) for technical support.

{% hint style="info" %}
A metal wear shows as red powder (i.e., rust debris).
{% endhint %}

4. Examine all the bolted joints for metal wear. If there is a sign of rust debris, contact Product Support Engineering (PSE) for technical support.

{% hint style="warning" %}
DO NOT LOOSEN THE BOLTED JOINTS OF THE MAIN DRIVESHAFT. IF THE BOLTED JOINTS ARE LOOSENED, THE MAIN DRIVESHAFT MUST BE REPLACED.
{% endhint %}

5. At all the bolted joints, visually examine the torque witness mark and shake the main driveshaft to make sure that there is no loose hardware. If there is a sign of a loose nut or bolt, contact Product Support Engineering (PSE) for technical support.

{% hint style="warning" %}
DO NOT PRESSURE WASH OR FULLY SOAK THE MAIN DRIVESHAFT WITH FLUIDS OR CLEANERS OR DAMAGE TO THE DRIVESHAFT CAN OCCUR.
{% endhint %}

6. At all the bolted joints, examine the flexframes with a bright light and a 10x magnifying glass as follows:
   1. At all the bolted joints, clean the flexframes with a clean cloth (C-516) and drycleaning solvent (C-304).
   2. Examine each flexframe for cracks over the full circumference around the bolt head side and over the full circumference around the nut side.
   3. On each flexframe, examine the inside and outside corner radii and radii edges for cracks. Make sure to examine the corner radii edges on both sides of the flexframes.
   4. Examine the shaft flanges for cracks over the full circumference around the nut side.
   5. Examine the adapter flanges for cracks over the full circumference around the nut side.
   6. If there is a sign of a loose nut or bolt, rust debris, or cracks on the main driveshaft, contact Product Support Engineering (PSE) for technical support.

## Requirements after job completion

### Required conditions

<table><thead><tr><th>Required condition</th><th data-type="content-ref">Reference</th></tr></thead><tbody><tr><td>Install the left transmission fairing (432AL).</td><td></td></tr><tr><td>Install the right transmission fairing (432BR).</td><td></td></tr><tr><td>Install the forward engine cowling (441AT).</td><td></td></tr></tbody></table>
