Chinook CH-47/Mission

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1.1 General

Three cargo hooks (forward, mid and aft) are mounted on the belly of the aircraft for attaching external cargo. Each hook can be used to carry a separate load, in tandem configuration with the front and aft hooks, or in a triple hook configuration.

All hooks have normal and emergency release modes. Normal release is performed with hydraulic pressure from the utility hydraulic system and is activated by a release switch on the cyclic, or on the hoist HUD. Emergency list on all hooks is performed electrically off of the hot battery bus.

Figure 1: Middle Cargo Hook

1.2 Middle Cargo Hook

The middle cargo hook (see Figure 1) is positioned near the CG of the helicopter and is the ideal hook for larger single hook loads. The middle hook is mounted on a pivoting arm that swings up or down to allow the rsecue hatch door to be closed. The hook can also be removed to allow use of the rescue hoist system. Click the arm to swing it up or down. The middle hook will hide/show as necessary when the rescue winch is deployed or hidden.

Figure 2: Forward Cargo Hook
Figure 3: Cargo Hook Panel

1.3 Forward and Aft Cargo Hook

The forward (see Figure 2) and aft hooks are mounted on the centerline of the aircraft in front of and behind the rescue hatch. These hooks may be used independently, or together for tandem loads.

1.4 Cargo Hook Controls

The hook control panel is located on the upper control panel (see Figure 3). The control panel contains the following elements:

  • HOOK MASTER - Energizes the hook system. The hook system requires both utility hydraulic and DC electrical power. In addition to energizing the hook system, turning this switch to OFF and back ON will reset the hooks to the closed position.
  • HOOK LOADED light - This light illuminates when any of the hooks have a load attached to them.
  • HOOK SEL - Selects which hooks will open hydraulically when the normal hook release button is pressed.
  • EMERG HOOK REL - Emergency hook release. Opens all hooks even when hydraulics are not active.

In addition to the control panel, there are three caution/alert panel lights that indicate when each hook is open.

1.5 Attaching Loads to the Hook

Loads are normally attached by ground personnel while the pilot maneuvers the helicopter over the load. Use the following procedure to attach the load.

  1. Rez the load right-side up on the ground.
  2. Have pilot fly into position over the load. Cycle the HOOK MASTER if necessary to close the hooks.
  3. Ground personnel clicks on one of the loops to "hold" it. The loop will maintain the distance from the avi at the time it was clicked. Use mouselook to move the loop and maneuver it onto a hook.
  4. Once all loops are attached to hooks, signal the pilot to pick up the load.

1.6 Flying with a Hook Load

Once a load is attached, the load will drag on the ground in non-physical mode until cables have stretched to their hang distance. When picking up a load it is important to pick straight up until the load brakes contact with the ground and is hanging freely.

While flying with a load, the maximum allowed airspeed is 120 knots. It is also recommended to make sim crossings away from corners and as near to a right angle as possible.

1.7 Building Loads

The Chinook is packaged with a hook kit allowing you to build and share your own loads for the cargo hook system. The system is designed to offer a great deal of flexability in how you configure your loads. The prim components of the system are full perm, while the script is copy/transfer allowing you to share any loads you create. The primary prim components of a load are:

  • sa-hookLoop - This is the actual loop that is attached to the hook on the helicopter.
  • sa-anchor - Anchor point on the load.
  • sa-cable - Cable connecting the loop and the load.

You can detach these from the built-in loads to create your own loads.

The Chinook hook system has three hooks that can be used in single attach, tandem (front and back), or triple hook modes. You load should include one, two or three hook loops depending on what type of attachment you want to use it with.

For each hook loop, you can include either one or two cables and anchors. Edit the anchor to its desired position on the load, and the hook loop to its "resting" position to were it will be returned when the loop is not attached to a hook, and not held by an avatar. The cables may be placed anywhere and will be automatically adjusted when the script is dropped onto the load or reset. Note that the root prim should be positioned so that is is "right side up" (i.e., rotation other than z-rotation is 0).

Once you have edited the anchors and loops where you want them, drop in the script, or reset the script if it is already installed (simply pull the script from one of the included loads). The cables will arrange themselves to attach between a loop and one or two anchors. The closest two anchors to each loop will be used.

Several menu options are available for loads. The load menu can only be accessed by the owner and is brought up by clicking on an anchor. Available options are:

  • Link Msg - This is an option than can be turned on/off. When the option is on, a link message with a integer value of -749203379 will be sent when the load changes states (e.g.,suspeneded or not suspended). This message can be intercepted by other scripts to perform other customized actions.
  • Hang Height - Sets the height below the helicopter at which the load will hang.
  • Access - Sets who can maniuplate the hook loops. Default is anyone.
  • Stat Drp - Enables/disabled static drop mode. When static drop is enabled, the cargo load will turn static when dropped rather than staying physical. This can be useful for dropping boats on the water surface.


Figure 4: Hoist Harness
Figure 5: Hoist Panel
Figure 6: Hoist HUD

2.1 General

This helicopter is equipped with a hydraulically powered rescue hoist with a harness that can be used through the floor hatch in the center of the main cabin (see Figure 4). The hoist is located in the cabinet behind the pilot-side of the cockpit. When deployed for use, a combination of pulleys is used to route the cable over the hatch. The rescue harness is deployed and stowed by clicking the pulley, or pulley housing over the hatch.

In order to use the rescue hoist, the middle hook must be removed. Deploying the hoist will automatically hide the middle hook. While the harness may be deployed without opening the floor hatches, both hatches must be open to extend the hoist cable. Users are advised not to close the hatches while the cable is deployed through them to avoid damage to the cable.

2.2 Hoist Panel

The control panel (see Figure 5) for the hoist system is located on the overhead panel. Hydraulic and AC power must be available to use the hoist. To use the system, move the HOIST MSTR switch to the ON position. The hoist can then be controlled using the HOIST rocker switch with OUT, OFF and IN positions. The switch is spring loaded to the OFF position and must be held in place to let the cable out or in.

The control panel also has a guarded cable cutter switch that will cut the hoist cable. This may be used in if the cable becomes entangled or emergency conditions. Note that the safety of any occupants of the harness when the cable is cut is not guaranteed.

2.3 Hoist HUD

The hoist may also be controlled through a HUD (see Figure 6) by anyone sitting in the helicopter or in the harness. The HOIST MSTR in the cockpit must be on to operate the HUD. The HUD includes buttons to raise and lower the harness, as well as a readout showing the helicopter height and the amount of cable payed out. A guarded cable cut button is also provided. In addition to the hoist controls, the hoist HUD also includes a release button for the hook system.

2.4 Hoist/Hook Chat Commands

The following chat commands are supported for the hoist and hook systems:

Command Description
w n Set cable length to n meters
w u n Move cable up by n meters
w d n Move cable down by n meters
w cutcable Cut the cable
w hookopen Open hooks