Armored Core 3: Silent Line Hints II (PS2)

Following the destruction of the machine run society of Layered, mankind has slowly begun the process of returning to the surface and repopulating the face of the globe. All is well with mankind, or so the corporations would lead you to believe, but things are looking up. Reconnaissance teams are sent out all over the world to search the land and determine what has changed, and everything seems to be reachable; except for one area that continually eludes scouting. All attempts to investigate this region are met with complete loss of contact from the exploratory units. Anything that attempts to cross the line goes silent; thus, this demarcation becomes known as the 'Silent Line.'
What is behind the Silent Line? Why does everything that crosses it goes missing? As a Raven of Global Cortex, you are sent to the Silent line to discover exactly what is behind it. Be on your guard, Raven! Something sinister could be lying in wait...
(Wikipedia)

GAMEPLAY HINTS

Investigate mission

Go to the first door, unlock the control panel, then search for the second one. In the room where there is a ventilation duct, shoot the duct. Fly up, then go down into the other room it leads to. Destroy all the boxes to find the left arm part KWG-NHZL60.

Protect Part Transport mission: Hidden parts

Wait until the plane lands, then get behind the it. Shoot the back end until the door explodes. Press Circle next to the part to get the right arm part CWG-ARF-180.

When the mission starts, turn around and go to the left storage room. Go inside and get the part. It is the left grenade rifle CWGG-GRSL-20.

Qualification Exam: Hidden part

Destroy Diligent and Carom in the Qualification Exam mission. You will get the machine gun MWG-MG/700H and the arm part MAH-SS/VV.

Rescue Power Plant mission: Hidden part

In this mission you need to activate the fire suppression system. Go down the elevator and move down the hall past the passage on the left. Then, go down the one on the right. At the end of this passage, there is a broken door with enemies on the other side. However there is a way in. There is also a room nearby in the same passage with a vent grate at the back right corner. Shoot the grate and follow the shaft to a room with some enemies and go through the door. The part is next to the broken door. OP-TQ-ESE which reduces consumption of energy based shields.

Safeguard Alloy Sample mission: Hidden part

Destroy all the enemy MTs and the AC Grinder. The Transport Truck must survive to the Crest's Headquarters. After the mission ends, you will receive new mail from Crest stating that you will get the extension part booster CEBT-HEX.

Search Vilius Laboratory mission: Hidden part

Search the bottom of the deepest pit to find a part guarded by a MT. It is the left arm part MWG-KPL/150.

Secure Fortress NK-432 mission: Hidden parts

Find the room filled with lots of boxes. Do not destroy any boxes with red triangles or any boxes on top of red triangle boxes (the top box destroys the one under it, etc.). The right arm part MWG-GS/80 can now be found on the ground. Use your map near the first target to find a secret passage behind the wall. Destroy that part of the wall and follow the secret passage until you reach a room with one box. Destroy the box to find the head part MHD-MX/BEE

Here's a gameplay video: