Aft Portable Trough Cover
The aft portable cover or Flush Deck Nose Gear
Launch (FDNGL) cover, covers the launch valve area
and houses the bridle tensioner cylinder and NGL unit.
Access covers are provided for the bridle tensioner
hydraulic lines.
Shroud and Periphery Drain
On most ships, a shroud and periphery drain
assembly is installed directly below the FDNGL cover
and on top of the launch valve to further protect the
launch valve and its associated piping from corrosion
4-23
RETAINER
BAR
FILLER
BAR
INTERMEDIATE
TROUGH COVER
CATAPULT TROUGH
CENTERLINE
CYLINDER CENTERLINE
CL
CYLINDER
CL
CYLINDER
FOOTSTOOLS
UPPER SUPPORT
BAR
LOWER SUPPORT
BAR
STEAM SMOTHERING
PIPING
TROUGH STEAM
PREHEAT PIPING
TROUGH, FORWARD OF STATION 0 (TYPICAL)
SHROUD AND
PERIPHERY DRAIN
FLUSH DECK NOSE GEAR
LAUNCH COVER
TROUGH, AFT OF STATION 0 (TYPICAL)
ABEf0432
Figure 4-31.—Catapult trough installation.
