Raising the Dome Flashcards
6 Modes of Operation
Automatic (remote) Hydraulic
Manual (RMCU) Hydraulic
Auxiliary Hydraulic
Auxiliary Electrical
Hand Crank
Raise Speed Limiter (RSL)
Functions with servo-valve on hydraulic motor and sending signal to ensure raise speed does not exceed a se threshold
Does not function during lowering
Does not function during Aux Electric mode because it doesn’t use hydraulic servo-valve
Does not function during Aux Hydraulic mode because RMIU part of function is bypassed and Aux Hydraulic control limits the speed
Automatic (remote)
Manual (RMCU)
Normal dipping sonar operating modes
Full capabilities and safety features
Hydraulic motor drives gear train assembly connected to reel and cable
Codes and Raise Modes
10XX / 20XX - Run BIT, no recommended mode of recovery
11XX / 21XX - Hold Safety Override for 6 seconds until Safety Override illuminates, then normal hydraulic recovery procedures
12XX / 22XX - Use Aux Electric
13XX / 23XX - Use Aux Hydraulic
Non Operating Modes
Aux Electric and Aux Hydraulic are not normal operating modes and shall only be used while conducting maintenance check, simulating malfunctions, or executing emergency procedures
Aux Hydraulic
Manually control servo valve in event of RMIU fail, bypassing RMIU and RMCU
Bypasses all safety interlocks, does not auto stop transducer at trail position, and does not auto seat or lock transducer
Operatior must manually latch TA
Used if prescribed by emergency procedures or in the event of electrical power loss
No ESD sequence in this mode
Only needs hyd power and 28 Vdc essential power
Most commonly used for correcting miswraps, reseating transducer to obtain a SEATED indication and retrieving transducer when a fault or failure in reeling machine control system has occurred
Aux Electric
Uses aux motor to drive gear train assembly
Full safety features and will auto close the array when raise is selected
Auto stop TA at trail position and auto seat and lock when raised into the aircraft
Because of slower raise speed, cable is not sufficiently tensioned which may result in problems if TA has been raised from 1000ft or deeper
Used if prescribed by emergency procedures or in the event of a hydraulic fault
Except when executing emergency procedures, shall only be used when TA is submerged
If raises from >1000ft, cable should be re-tensioned with normal hydraulic mode before resuming dipping
Only operates in the raise direction
Aux Hardware Electric
Uses aux motor to drive gear train assembly
Bypasses all safety interlocks, does not stop transducer at trail and has to be manually locked
Raise speed will always be 6ft/sec
Used if prescribed by emergency procedures or as a last resort to recover transducer when there are failures preventing any other mode of operation
Raise direction only
Hand Crank
Used only for maintenance purposes
Disables hydraulic and Aux Electric modes
