TM  1-1520-240-10            4-3-19 4-3-12.  Manual Release System. NOTE Depending on the mission requirement, the manual release lever may be positioned in the forward or stowed position. The manual emergency release lever for all three cargo hooks is located on the right side of the rescue hatch door. The lever is connected by cables to the manual release mechanism in each hook. The lever has three positions; forward, vertical, and aft. In the forward posi- tion the lever is stowed. In the vertical position the lever is in the normal position when external cargo is carried on any of the hooks. In the aft position the lever releases all hooks simultaneously, loaded or not. 4-3-13.  Cargo Hook Cautions. The cargo hook caution capsules are on the master cau- tion panel. They are labeled FWD HOOK OPEN, MID HOOK OPEN, and AFT HOOK OPEN. A lit caution cap- sule indicates that the corresponding hook has opened. The cautions can be extinguished by setting the CARGO HOOK MSTR switch to RESET or by setting the CARGO HOOK switch on the hoist operators panel to RESET. 4-3-14.  Hook Loaded Advisory Lights. Two advisory lights marked HOOK LOADED are on the CARGO HOOK control panel (fig 4-3-3). The lights are marked HOOK LOADED. When on, the light indicates that the corresponding (forward or aft) hook has a load of above approximately 150 pounds on it. The lights are turned on by sensors in the forward and aft hooks. WARNING If the DUAL HOOK FAULT light indicates a malfunction of the forward or aft hook, re- leasing  the  load  using  other  than  the manual release handle is prohibited. 4-3-15.  Dual Hook Fault Caution. A caution capsule labeled DUAL HOOK FAULT is on the master  caution  panel.  The  light  provides  continuous monitoring of the electrical continuity of the release sole- noids in the forward and aft hook. When on, it indicates a loss of electrical release capability of the forward and/or aft hook in both normal and emergency modes. When the capsule is on, loads on the forward or aft hooks can only be released by the manual release system. 4-3-16.  Cargo Hooks Operational Check. WARNING When  stowing  or  positioning  the  cargo hook, do not grasp the hook assembly by the  synchronizing  assembly  shaft.  Seri- ous injury can result if the hook is oper- ated while the hand is in this position. The nylon web strap is to be used when posi- tioning or stowing the hook. Before external load operations, perform the following check of the cargo hooks. 1.   CARGO HOOK MSTR switch — ARM. 2.   CARGO HOOK SEL switch — FWD. 3.   Press the CARGO HOOK RELEASE switch on the pilot’s cyclic stick — Check that the FWD HOOK OPEN caution capsule comes on and the hook opens. NOTE The forward and aft hooks will not open unless a force is applied. As long as one of the CARGO HOOK RELEASE switches  are  pressed,  the  forward  and  aft  hooks  will make a chattering sound. This sound indicates the hook solenoids are operating normally. 4.   CARGO HOOK SEL switch — MID. 5.   Press the CARGO HOOK RELEASE switch on the copilot’s cyclic stick — Check that the MID HOOK OPEN caution capsule comes on and the hook opens. 6.   CARGO HOOK SEL switch — AFT. F 7.   Press the CARGO HOOK RELEASE switch on the WINCH/HOIST CONTROLGRIP — Check that the AFT HOOK OPEN caution capsule comes on and the hook solenoid activates. Reset and release to OFF. 8.   CARGO  HOOK  MSTR  switch  —  RESET and release to OFF. Check all HOOK OPEN caution lights go out and the hooks close. Then set ARM. 9.   CARGO HOOK SEL switch — TANDEM. 10.   Press the CARGO HOOK RELEASE switch on  the  pilot’s  cyclic  stick.  Check  that  the FWD and AFT HOOK OPEN caution cap- sules come on and the forward and aft hook solenoids activate. 11.   CARGO  HOOK  MSTR  switch  —  RESET and  release  to  OFF.  Check  both  HOOK OPEN  caution  capsules  go  out  and  the hooks close. Then set to ARM. 12.   CARGO HOOK SEL switch — ALL. 13.   Press CARGO HOOK RELEASE switch on the copilot’s cyclic stick — Check that all