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As you can only pick one, discuss with your fellow engineering comrade for the one that best suits your needs. Moving on, the most important equipment, your tools as an engineer:

Tools of the Trade

Image	Name	Function
	Screwdriver	Used for securing and unsecuring sentries, Also used to open panels on vendors and doors.
	Blowtorch	Used for cutting through walls and fixing sentries. Has 20 units of fuel inside.
	Crowbar	Used for Opening unpowered doors and displacing girders so you can move them.
	Wrench	Used to rotate sentries, disassemble certain objects, unsecure and secure vendors and girders.
	Cable coil	Used for fixing robotics and placing wire on the ground.
	Multitool	Used to hack doors and vendors, or for disarming mines.
	Wirecutter	Used for cutting cable coil on the ground, and for cutting wires and mending wires in doors.
	Light Replacer	Used to replace lights quickly. Feed with glass to refill.
File:Pipepeeper.png	T-Ray Scanner	A terahertz-ray emitter and scanner used to detect underfloor objects such as cables and pipes.

The Basics

Power Duty

As an Engineer, you'll be given a various amount of duties. Generally one of the first two duties is FOB or Power Duty. To setup power, you'll want to locate the geothermal generators and assess the damage. Depending on the sprite, the generator will need different steps:

= Welder -> Wirecutters -> Wrench

= Wirecutters -> Wrench

= Wrench

APC Maintenance

If the APC hasn't been blown up or destroyed during a gunfight always check the apcs wires by unscrewing the apc frame and click on the apc with your wirecutters, if the wires come up with a mend option, mend the wires with the wirecutters. (Click on mend while holding wirecutters in your active hand.) If someone blew up the apc or blasted it into another dimension follow the steps below.

So, someone decided to throw a grenade next to the APC or you just arrived to a broken APC and your SL has tasked you with fixing it whilst the squad holds off the incoming xeno tide. No need to panic as this section will get you to quickly repair that APC.

First you'll want to whack off the cover; to do this just hit the APC with any sort of weapon, generally a combat knife is good for this.
Take out the battery (Power cell) in the APC once the cover is off with an empty hand.
Use a screwdriver on the APC.
Use wirecutters on the APC.
Use a crowbar on the APC.
Build an APC frame from 2 metal sheets then click on the APC with the APC frame in hand.
Use wires (Cable Coil) on the APC.
Click on the APC with a power control module in hand.
Use a screwdriver on the APC.
Place a new battery (Power cell) in the APC. (Just click on the APC with the battery in hand.)
Use a crowbar on the APC.
Open up the APC pop up window once you've completed all previous steps and turn on the breaker.

Hacking

Doors

Wires:	Description:
The door bolts look down	Means that the bolts are currently down, and you will be unable to open the door. Pulsing this wire will open or lower it.
The door bolt lights are off	Indicates when bolts are up or down. Off means you won't be able to tell it's bolted
The test light is off	The power wire. There are two of these. If the test light is off, you can crowbar it open.
The AI control allowed light	Allows control for the AI. Functionally useless in CM
The Check Wiring light	No use.
The Check Timing Mechanism light	How fast the door closes. If it's on, it will close instantly, crushing people under it.

Vendors

Wires:	Description:
Orange Light	Electricity wire. If this is on, whenever the vendor is used it will shock the user.
Red Light	Firing wire. If this this on, it will launch the contents of the vendor at nearby people.
Green Light	Contraband wire. Turning this wire on means non-standard gear will be avaliable.
Purple Light	Access wire. Turning this wire off changes it to a yellow light, making it so anyone can dispense the contacts.

FOB Defences

Defensive Equipment

Defensive Equipment:	Description:
Sentry Gun	The Sentry Gun automatically tracks and fires upon any target that is wearing an ID not hooked up to the Almayer's systems. Via IFF, they are unable to hit friendly marines, allowing them to be safely placed behind marine laws as they lay down supressing fire. Comes with various options, such as 360 degree mode, burst fire, and the ability to take control of it. Has 300 bullets. How to construct it: Construct Turret Frame with Plasteel -> Wrench it -> Apply Cable -> Add Turret Piece -> Add Turret Sensor -> Apply Metal -> Weld it -> Add bigger battery if needed. Rotate with wrench, screwdriver to make it movable. Weld to repair it.
M56D Mounted Smartgun	The M56D HMG is an emplacement that a marine will have to man in order to fire it. It fires heavier smartgun bullets that have increased penetration, at the downside of being immobile and not having IFF, allowing it to friendly fire. With CTRL-Click, you'll be able to toggle on burst fire. Holds 700 rounds. How to construct it: Click on the mount once it's in your hand -> Wrench it -> Mount the Gun -> Screwdriver it -> Apply Ammo Drum. Rotate with wrench, deconstruct with screwdriver.

Fortifications of the Trade

Name	Material Needed	Function
Wood Barricade	Wood	Used for a hasty defence against aliens. Mostly seen prespawned.
Metal Barricade	Metal	Used for areas that will be under constant attack. Can be repaired with a blow torch.
Sandbags	Sandbags	Used for making directional defences, multiple can be applied to a tile. Needs to be filled up with empty sandbags and an entrenching tool. 25 in a filled stack.
Plasteel Barricade	Plasteel	Used to allow passage by closing it, and providing heavy protection. Can be repaired with a blow torch
Barbed Wire	Metal	Used to make barricades and sandbags stronger, and making it so they can't be ran or climbed over. Also damages any thing that attacks it.
Wall	Metal	Used to fully block off an area.