TM 5-5420-278-100011 000011 00-2INTERIOR BAY CONTROLS AND INDICATORS (Contd)OUTER PONTON LOCKS — There are two outer ponton locks at each endof the IRB-I. Each is engaged by inserting the end of a T-wrench (refer toItem 2, WP 0070 00) into a hole in the bellcrank; the bellcrank is accessedthrough an opening at the end of the outer ponton walkway. The bellcrank isrotated until the lock/release lever is visibly engaged on the striker plate,located on the adjacent inner ponton.DUPPER COUPLING, LONGITUDINAL — There are two identical uppercouplings and two receptacle blocks at each end of the IRB-I. The uppercoupling consists of a spring-loaded lever mounted in a receptacle block ateach end of both inner pontons. A receptacle block is adjacent to each uppercoupling. The upper coupling is used for bay-to-bay connection; when two baysare in position to be joined longitudinally, the two upper couplings on eachbay are manually closed by placing them in the receptacle blocks of theopposite IRB-I or IRB-R.UPPER COUPLING, TRANSVERSE — There are two identical uppercouplings, each located on the inner pontons, that consist of a spring-loadedlever mounted in a receptacle block. When the bay is unfolded, both uppercouplings are manually closed by placing them in the opposite receptacle blockof the adjacent inner ponton. They are both opened prior to IRB-I retrieval;this is essential prior to lifting to prevent damage.FEOPENING, OUTERPONTON WALKWAYOPENING, OUTERPONTON WALKWAY INTERIOR BAY (UNFOLDED)HOOK LEVERS ANDSTRIKE PLATESBELLCRANKBELLCRANKDDFOLDLOCKS, OPENPOSITIONTRAVEL LATCH,LOCATING RECEPTACLETRAVEL LATCH LEVER,OPEN POSITION
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