> ## Documentation Index
> Fetch the complete documentation index at: https://www.narev.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# CDU preflight

> CDU preflight: conditions, actions and checks for the Boeing 737-800.

Use this procedure when its prerequisites apply. Confirm each required aircraft state before acknowledging the corresponding checklist item.

## General

Complete the preliminary, CDU, captain and first-officer procedures in the applicable ground configuration. Retain the side-specific requirements. A captain instrument or control does not satisfy an independent first-officer or standby check.

Use the assigned detailed panel procedures for Set, Check, Test and Pass requirements. Observe the specified result and restore the required operating configuration after each actual cockpit test. Do not operate a system merely because its control appears in the reference list.

Complete loading, performance preparation and the required equipment checks before progressing to the dependent departure procedures. Where an item requires an external inspection or crew adjustment, retain the assigned verification or explicit scenario exclusion.

### 1. Initial data — **Set**

Enter the required CDU initial data. Confirm the page and field before entry, then verify the accepted value.

> **Checks and evidence**
>
> **Expected response:** Set
>
> **Verification:** Verify the actual target field on the expected page and the accepted value.

### 2. Navigation data — **Set**

Enter the assigned route, runway and navigation procedure. Review the route and any modification before EXEC.

> **Checks and evidence**
>
> **Expected response:** Set
>
> **Verification:** Read back the intended route and relevant procedure/leg information on its displayed pages.

### 3. Performance data — **Set**

Enter the performance data for the actual aircraft loading and configuration. Verify the accepted weights, flap, trim and reference-speed data.

> **Checks and evidence**
>
> **Expected response:** Set
>
> **Verification:** Verify accepted data and performance outputs for the actual aircraft loading.

## Continue after this procedure

No explicit source transition is declared. Select the next applicable procedure after the required completion and entry conditions are established.


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