QUALITATIVE FAILURE ANALYSIS
The following qualitative failure analysis is provided to show compliance with:
• Subchapter K Small Passenger Vessels, 46 CFR 121.620
• Subchapter L Offshore Supply Vessels, 46 CFR 130.120
• Subchapter T Small Passenger Vessels, 46 CFR 184.620:
Propulsion engine control systems.
A A vessel must have two independent means of controlling each propulsion engine. Control
must be provided for the engine speed, direction of shaft rotation, and engine shutdown.
• One of the means may be the ability to readily disconnect the remote engine control linkage
to permit local operation.
B A multiple engine vessel with independent remote propulsion control for each engine need
not have a second means of controlling each engine.
C In addition to the requirements of paragraph (a) of this section, a vessel must have a reliable
means for shutting down a propulsion engine, at the main pilot house control station, which is
independent of the engine's speed control.
D A propulsion engine control system, including pilothouse control, must be designed so that a
loss of power to the control system does not result in an increase in shaft speed or propeller
pitch.
E All microprocessor or computer based systems must meet the requirements of part 62 in
subchapter F of this chapter.
Propulsion control.
A Each vessel must have:
• A propulsion-control system operable from the pilothouse; and
• A means at each propulsion engine of readily disabling the propulsion-control system to
permit local operation.
B Each propulsion-control system operable from the pilothouse must enable:
• Control of the speed of each propulsion engine;
• Control of the direction of propeller-shaft rotation;
• Control of propeller pitch, if a controllable-pitch propeller is fitted; and
• Shutdown of each propulsion engine.
C The propulsion-control system operable from the pilothouse may constitute the remote
stopping-system required by Sec. 129.540 of this subchapter.
D Each propulsion-control system, including one operable from the pilothouse, must be
designed so that no one complete or partial failure of an easily replaceable component of the
system allows the propulsion engine to over speed or the pitch of the propeller to increase.
9000 Series Servo Throttle - Solenoid Clutch, Qualitative Failure Analysis & Design
Verification Test Procedure
Document # AUTHOR CHECKED APPROVED DATE
ENG-145 Rev A Tim Jones Jim D Smith Robert Anderson 4/19/04
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