> For the complete documentation index, see [llms.txt](https://bell-505-guide.gitbook.io/bell-505-maintenance-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bell-505-guide.gitbook.io/bell-505-maintenance-guide/line-maintenance/servicing.md).

# Servicing

Line maintenance servicing includes replacing fluids, lubricating components, and inspecting the helicopter and its components to maintain their serviceability.

## Sch**eduled Maintenance Checks**

The following is a list of the manufacturer recommended scheduled maintenance checks and inspections that may be carried out in the line maintenance environment.

{% hint style="info" %}
Refer to [Dimensions and Areas](/bell-505-maintenance-guide/system-descriptions/airframe-systems/dimensions-and-areas.md) for the identification and complete description of the zones.
{% endhint %}

### 25 flight hours inspection

<table><thead><tr><th width="126" align="center">Task type</th><th>Task description</th><th data-type="content-ref">Procedure/Data</th><th data-hidden>Zone</th><th data-hidden>Access</th></tr></thead><tbody><tr><td align="center">FNC</td><td>Do an engine power check.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/test-and-checks/power-assurance-check-pac.md">Power Assurance Check (PAC)</a></td><td>N/A</td><td>N/A</td></tr></tbody></table>

### 50 Flight Hours Inspection

<table><thead><tr><th width="128" align="center">Task type</th><th>Task description</th><th data-type="content-ref">Procedure/Data</th><th data-hidden>Zone</th><th data-hidden>Access</th></tr></thead><tbody><tr><td align="center">LUB</td><td>Lubricate the main rotor grips. </td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/lubrication/lubricating-the-main-rotor-grips.md">Lubricating the main rotor grips</a></td><td>420</td><td>N/A</td></tr><tr><td align="center">LUB</td><td>Lubricate the trunnion bearings.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/lubrication/lubricating-the-trunnion-bearings.md">Lubricating the trunnion bearings</a></td><td>420</td><td>N/A</td></tr><tr><td align="center">LUB</td><td>Lubricate the bearing of the pillow block assemblies.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/lubrication/lubricating-the-pillow-block-assemblies.md">Lubricating the pillow block assemblies</a></td><td>420</td><td>N/A</td></tr><tr><td align="center">LUB</td><td>Lubricate the swashplate and support assembly (duplex bearing).</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/lubrication/lubricating-the-duplex-bearing.md">Lubricating the duplex bearing</a></td><td>432AR, 432AL</td><td></td></tr></tbody></table>

### 50 Flight Hours / 1 Year Inspection

{% hint style="info" %}
Complete the following tasks each 50 hours of operation time or 1 year, whichever occurs first.
{% endhint %}

<table><thead><tr><th width="124" align="center">Task type</th><th>Task description</th><th data-type="content-ref">Procedure/Data</th><th data-hidden>Zone</th><th data-hidden>Access</th></tr></thead><tbody><tr><td align="center">LUB</td><td>Lubricate the needle bearings of the tail rotor hub assembly.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/lubrication/lubricating-the-needle-bearings.md">Lubricating the needle bearings</a></td><td>460</td><td>N/A</td></tr><tr><td align="center">DET</td><td><p><em>Only applicable to P/N SLS- 030-910-109.</em></p><p>Do a detailed inspection of the restraint assembly.</p></td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/50-flight-hours-1-year-inspection.md">50 flight hours/1 year inspection</a></td><td>433</td><td>433AL, 433BR</td></tr></tbody></table>

### 100 Flight Hours Inspection

<table><thead><tr><th width="100" align="center">Task type</th><th>Task description</th><th data-type="content-ref">Procedure/Data</th><th data-hidden>Zone</th><th data-hidden>Access</th></tr></thead><tbody><tr><td align="center">FNC</td><td>Do a torque check of the pillow block assemblies attaching hardware.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/100-flight-hours-inspection.md">100 flight hours inspection</a></td><td></td><td></td></tr><tr><td align="center">LUB</td><td>Lubricate the tail rotor pitch change mechanism.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/lubrication/lubricating-the-pitch-change-mechanism.md">Lubricating the pitch change mechanism</a></td><td></td><td></td></tr><tr><td align="center">DET</td><td>Do a detailed inspection of the bellcrank assembly spherical bearings.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/100-flight-hours-inspection.md">100 flight hours inspection</a></td><td></td><td></td></tr></tbody></table>

### 100 Flight Hours / 6 Months Inspection

{% hint style="info" %}
Complete the following task each 100 hours of operation time or 6 months, whichever occurs first.
{% endhint %}

<table><thead><tr><th width="100" align="center">Task type</th><th>Task description</th><th data-type="content-ref">Procedure/Data</th><th data-hidden>Zone</th><th data-hidden>Access</th></tr></thead><tbody><tr><td align="center">DET</td><td>Do a detailed inspection of the main driveshaft.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/100-flight-hours-6-months-inspection.md">100 flight hours/6 months inspection</a></td><td></td><td></td></tr></tbody></table>

### 100 Flight Hours / 1 Year Inspection

{% hint style="info" %}
Complete the following task each 100 hours of operation time or 1 year, whichever occurs first.
{% endhint %}

<table><thead><tr><th width="100" align="center">Task type</th><th>Task description</th><th data-type="content-ref">Procedure/Data</th><th data-hidden>Zone</th><th data-hidden>Access</th></tr></thead><tbody><tr><td align="center">SDI</td><td>Do a special detailed inspection of the main rotor blades.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/100-flight-hours-1-year-inspection.md">100 flight hours/1 year inspection</a></td><td></td><td></td></tr></tbody></table>

{% hint style="info" %}
The following tasks are only applicable if the hydraulic pump P/N M206-20H030-043 is installed for the first time or replaced.
{% endhint %}

<table><thead><tr><th width="100" align="center">Task type</th><th>Task description</th><th data-type="content-ref">Procedure/Data</th><th data-hidden>Zone</th><th data-hidden>Access</th></tr></thead><tbody><tr><td align="center">DIS</td><td>Drain and discard the hydraulic fluid and the hydraulic pressure filter element.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/removal-installation/hydraulic-power/restoring-replacing-the-hydraulic-pressure-filter-element.md">Restoring/replacing the hydraulic pressure filter element</a></td><td></td><td></td></tr></tbody></table>

### 100 Flight Hours / 18 Months Inspection

<table><thead><tr><th width="100" align="center">Task type</th><th>Task description</th><th data-type="content-ref">Procedure/Data</th><th data-hidden>Zone</th><th data-hidden>Access</th></tr></thead><tbody><tr><td align="center">DET</td><td>Do a detailed inspection of the left and right Liquid Inertia Vibration Eliminator (LIVE) mount unit.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/100-flight-hours-18-months-inspection.md">100 flight hours/18 months inspection</a></td><td></td><td></td></tr></tbody></table>

### 150 Flight Hours Inspection

<table><thead><tr><th width="100" align="center">Task type</th><th>Task description</th><th data-type="content-ref">Procedure/Data</th><th data-hidden>Zone</th><th data-hidden>Access</th></tr></thead><tbody><tr><td align="center">DET</td><td>Do a detailed inspection of the pump driveshaft assembly.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/150-flight-hours-inspection.md">150 flight hours inspection</a></td><td></td><td></td></tr></tbody></table>

### 200 Flight Hours Inspection

<table><thead><tr><th width="100" align="center">Task type</th><th>Task description</th><th data-type="content-ref">Procedure/Data</th><th data-hidden>Zone</th><th data-hidden>Access</th></tr></thead><tbody><tr><td align="center">LUB</td><td>Lubricate the crew seat positioning mechanism.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/lubrication/lubricating-the-crew-seat-positioning-mechanism.md">Lubricating the crew seat positioning mechanism</a></td><td></td><td></td></tr><tr><td align="center">DET</td><td>Do a detailed inspection of the locking pins.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/200-flight-hours-inspection.md">200 flight hours inspection</a></td><td></td><td></td></tr><tr><td align="center">GVI</td><td>Do a general visual inspection of the seat tracks.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/200-flight-hours-inspection.md">200 flight hours inspection</a></td><td></td><td></td></tr><tr><td align="center">OPC</td><td>Do the FOPS test.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/test-and-checks/flame-out-protection-system-fops-test.md">Flame Out Protection System (FOPS) test</a></td><td></td><td></td></tr></tbody></table>

### 300 Flight Hours Inspection

<table><thead><tr><th width="85">Task type</th><th width="339">Task description</th><th data-type="content-ref">Procedure/Data</th></tr></thead><tbody><tr><td>DET</td><td>Do a detailed inspection of the tail damper assembly.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/300-flight-hours-inspection.md#do-a-detailed-inspection-of-the-tail-damper-assembly-as-follows">300 flight hours inspection</a></td></tr><tr><td>DIS</td><td>Discard and replace the HRFM filter element.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/removal-installation/hydraulic-power/replacing-the-hrfm-filter-element.md">Replacing the HRFM filter element</a></td></tr><tr><td>GVI</td><td>Do a general visual inspection of the hydraulic pressure line (from filter) and suction line (from HRFM).</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/300-flight-hours-inspection.md#do-a-general-visual-inspection-of-the-hydraulic-pressure-line-from-filter-as-follows">300 flight hours inspection</a></td></tr><tr><td>RST</td><td>Restore the hydraulic pressure filter element by cleaning.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/removal-installation/hydraulic-power/restoring-replacing-the-hydraulic-pressure-filter-element.md">Restoring/replacing the hydraulic pressure filter element</a></td></tr><tr><td>DET</td><td>Do a detailed inspection of the crew doors.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/300-flight-hours-inspection.md#do-a-detailed-inspection-of-the-crew-doors-as-follows">300 flight hours inspection</a></td></tr><tr><td>DET</td><td>Do a detailed inspection of the clamshell door.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/300-flight-hours-inspection.md#do-a-detailed-inspection-of-the-clamshell-door-as-follows">300 flight hours inspection</a></td></tr><tr><td>DET</td><td>Do a detailed inspection of the pivot sleeve assembly.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/300-flight-hours-inspection.md#do-a-detailed-inspection-of-the-pivot-sleeve-assembly-as-follows">300 flight hours inspection</a></td></tr><tr><td>DET</td><td>Do a detailed inspection of the support assembly.</td><td><a href="/bell-505-maintenance-guide/line-maintenance/servicing/inspection/300-flight-hours-inspection.md#do-a-detailed-inspection-of-the-support-assembly-as-follows">300 flight hours inspection</a></td></tr><tr><td>DET</td><td>Do a detailed inspection of the collective lever assembly.</td><td></td></tr><tr><td>DET</td><td>Do a detailed inspection of the idler assembly.</td><td></td></tr><tr><td>DET</td><td>Do a detailed inspection of the inner ring assembly.</td><td></td></tr><tr><td>FNC</td><td>Do an inspection and a functional check of the drive lever assembly, idler link assembly, and collar set swashplate drive assembly.</td><td></td></tr><tr><td>DET</td><td>Do a detailed inspection of the duplex bearing of the swashplate and support assembly.</td><td></td></tr><tr><td>FNC</td><td>Do a functional check (tilt friction check) of the swashplate and support assembly.</td><td></td></tr><tr><td>DET</td><td>Do a detailed inspection of the slide bearing assemblies.</td><td></td></tr><tr><td>DET</td><td>Do a detailed inspection of the outer ring assembly.</td><td></td></tr><tr><td>DET</td><td>Do a detailed inspection of the pitch link assemblies.</td><td></td></tr><tr><td>FNC</td><td>Do a functional check of the swashplate and support assembly (outer ring assembly).</td><td></td></tr><tr><td>FNC</td><td>Do a functional check (pressure check) of the nitrogen in the Liquid Inertia Vibration Eliminator (LIVE) mount units.</td><td></td></tr><tr><td>OPC</td><td>Do an operational check of the transmission and freewheel chip detectors.</td><td></td></tr><tr><td>SVC</td><td>Do a fluid level check of the rotor brake system and service if necessary, if installed.</td><td></td></tr><tr><td>FNC</td><td>Do a functional check (dynamic balance) of the tail rotor.</td><td></td></tr><tr><td>GVI</td><td>Do a general visual inspection of the crosshead, pitch link assemblies, pitch change mechanism, and tail rotor control tube.</td><td></td></tr><tr><td>GVI</td><td>Do a general visual inspection of the forward driveshaft.</td><td></td></tr><tr><td>GVI</td><td>Do a general visual inspection of the fan shaft assembly.</td><td></td></tr><tr><td>GVI</td><td>Do a general visual inspection of the aft driveshaft.</td><td></td></tr><tr><td>GVI</td><td>Do a general visual inspection of the driveshaft segments.</td><td></td></tr><tr><td>GVI</td><td>Do a general visual inspection of the forward adapter.</td><td></td></tr><tr><td>GVI</td><td>Do a general visual inspection of the aft adapters.</td><td></td></tr><tr><td>FNC</td><td>Do a functional check (torque check) of the attaching hardware of the disc packs of the forward driveshaft.</td><td></td></tr><tr><td>DET</td><td>Do a detailed inspection of the disc packs of the forward driveshaft.</td><td></td></tr><tr><td>FNC</td><td>Do a functional check (torque check) of the attaching hardware of the disc packs of the aft driveshaft and the driveshaft segments.</td><td></td></tr><tr><td>DET</td><td>Do a detailed inspection of the disc packs of the aft driveshaft and the driveshaft segments.</td><td></td></tr><tr><td>FNC</td><td>Do a functional check (torque check) of the attaching hardware of the tail rotor gearbox.</td><td></td></tr><tr><td>OPC</td><td>Do an operational check of the tail rotor gearbox indicating system.</td><td></td></tr><tr><td>GVI</td><td>Do a general visual inspection of the forward cable assemblies.</td><td></td></tr><tr><td>GVI</td><td>Do a general visual inspection of the aft cable assemblies.</td><td></td></tr><tr><td>FNC</td><td>Do a functional check (tension check) of the cables assemblies.</td><td></td></tr><tr><td>DET</td><td>Do a detailed inspection of the forward left and right mounts and the aft mount of the engine.</td><td></td></tr><tr><td>GVI</td><td>Do a general visual inspection of the oil cooler assembly.</td><td></td></tr></tbody></table>

<br>

### 300 Flight Hours / 1 Year Inspection

<table><thead><tr><th width="100" align="center">Task type</th><th>Task description</th><th data-type="content-ref">Procedure/Data</th><th data-hidden>Zone</th><th data-hidden>Access</th></tr></thead><tbody><tr><td align="center"></td><td></td><td></td><td></td><td></td></tr></tbody></table>

### 400 Flight Hours Inspection

<table><thead><tr><th width="100" align="center">Task type</th><th>Task description</th><th data-type="content-ref">Procedure/Data</th><th data-hidden>Zone</th><th data-hidden>Access</th></tr></thead><tbody><tr><td align="center">FNC</td><td>Do a fuel flow check of the left and right injector half-manifolds.</td><td></td><td></td><td></td></tr></tbody></table>

### 400 Flight Hours / 1 Year Inspection

<table><thead><tr><th width="100" align="center">Task type</th><th>Task description</th><th data-type="content-ref">Procedure/Data</th><th data-hidden>Zone</th><th data-hidden>Access</th></tr></thead><tbody><tr><td align="center"></td><td></td><td></td><td></td><td></td></tr></tbody></table>

### 500 Flight Hours Inspection

<table><thead><tr><th width="100" align="center">Task type</th><th>Task description</th><th data-type="content-ref">Procedure/Data</th><th data-hidden>Zone</th><th data-hidden>Access</th></tr></thead><tbody><tr><td align="center">RST</td><td>Restore the starter generator by replacing the brushes.</td><td></td><td></td><td></td></tr><tr><td align="center">DET</td><td>Do a detailed inspection of the restraint assembly of the crew seats.</td><td></td><td></td><td></td></tr><tr><td align="center">GVI</td><td>Do a general visual inspection of the crew seat cushions.</td><td></td><td></td><td></td></tr></tbody></table>