> ## 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.

# First officer preflight — part 4

> First officer preflight — part 4: 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. Takeoff config light — **Extinguished**

Require the takeoff-configuration light itself to be extinguished and observable.

> **Checks and evidence**
>
> **Expected response:** Extinguished
>
> **Verification:** Use the dedicated light, with valid power/availability.

### 2. Cabin altitude light — **Extinguished**

Check the cabin-altitude warning light, not merely the numeric cabin altitude.

> **Checks and evidence**
>
> **Expected response:** Extinguished
>
> **Verification:** Require a valid, extinguished CABIN\_ALT annunciator observation.

### 3. Light test — **Hold to 1**

Perform the specified cockpit light test using the proper test switch and acceptance criteria.

> **Checks and evidence**
>
> **Expected response:** Hold to 1
>
> **Verification:** Observe the required indications during the test and their restoration afterward.

### 4. Light test — **Hold to 2**

Perform the specified cockpit light test using the proper test switch and acceptance criteria.

> **Checks and evidence**
>
> **Expected response:** Hold to 2
>
> **Verification:** Observe the required indications during the test and their restoration afterward.

### 5. Flight instruments — **Check**

Cross-check the applicable flight instruments for this phase using valid readings and mission data.

> **Checks and evidence**
>
> **Expected response:** Check
>
> **Verification:** Use defined cross-check criteria and independent sources where the checklist calls for comparison.

### 6. Ground proximity panel — **Check**

Check the required GPWS panel state under an approved preflight inspection/test sequence. Do not inhibit warnings merely to clear a check.

> **Checks and evidence**
>
> **Expected response:** Check
>
> **Verification:** Require the correct inhibit/guard states and test results.

### 7. Landing gear panel — **Set**

Inspect the prescribed gear-panel configuration in the verified ground state; do not cycle the gear as an invented test.

> **Checks and evidence**
>
> **Expected response:** Set
>
> **Verification:** Use the gear-safe/transit indications plus actual required lever/panel state.

### 8. Auto brake select — **Rto**

Select autobrake RTO. Verify the selector and required indications.

> **Checks and evidence**
>
> **Expected response:** RTO
>
> **Verification:** Read RTO selector state and the required disarm indication.

### 9. ANTISKID INOP — **Extinguished**

Check the specific antiskid-inoperative annunciator is extinguished.

> **Checks and evidence**
>
> **Expected response:** Extinguished
>
> **Verification:** Use the dedicated antiskid indication with valid power.

## Continue after this procedure

Continue to [First officer preflight — part 5](https://www.narev.ai/docs/irl-gym/aircraft/procedures/first-officer-preflight-5.md). The checklist adds no condition between these parts; the next part’s individual step conditions still apply.


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