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 TB 740-97-4
galvanized sheet metal will be fitted into the window space and over the louvered openings, and the ducts fitted securely
into the flanges.
(d) Moist air return lines. Moist air return lines will be run to louvered opening on the starboard side of the
fanroom and to the scuttle leading from the engine room to the main deck. The scuttle will be secured in open position.
The operating mechanism will be removed from the scuttle cover and secured at the base of the engine room ladder to the
scuttle. Flanges of exterior grade plywood or galvanized sheet metal will be fitted over the louvered opening to the
fanroom and over the scuttle. The ducts will be fitted securely into the flanges.
(e) Humidistat. A hair type humidistat will be set to maintain a 40 percent relative humidity, plus or minus 5
percent, within the dehumidified areas. The humidistat will be installed in the engine room. The humidistat will be placed
approximately 3 feet above the floor plate level of the engine room. It will be attached to a stanchion which is located
approximately 6 feet forward of the aft bulkhead of the engine room. The humidistat will be connected to the
dehumidification machine by means of a No. 18, two conductor, rubber covered cable run through an opening in the flange
fitted over the engine room scuttle.
(f) Sensing elements. Humidity sensing elements will be installed as follows:
1. Pilothoruse. A humidity sensing element with 6 foot cable will be placed in the pilothouse, with the
mounting assembly installed through the flange to which the dry air duct is attached and with the sensing element
suspended approximately 3 feet above the deck in the vicinity of the steering wheel.
2. Engine room. A sensing element, identical to that specified for the pilothouse, will be placed in the engine
room. The mounting assembly will be installed through the flange attached to the scuttle, and the sensing element will be
tied to the ladder in a manner to hang clear at approximately 3 feet above the floorplate.
3. Windlass cover. A humidity sensing element, without cable, will be installed in the starboard side of the
sheet metal cover over the windlass, approximately 30 inches above the deck.
Change 2 F-3
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