tioned at the recorder and the other should be 

 at the launcher. 



Step 1. Plug in the recorder power cord to 

 120 VAC. This will cause the red reload light 

 indicator signal (A) to light (fig. C-20). Allow 

 a 15-minute warmup period. 



Step 2. Complete items one through three on 

 the Bathythermograph log. 



Step 3. Remove the canvas cover from the 

 launcher, and open the launcher breech fully 

 clocliwise; remove the expended canister used 

 when taking the previous XBT, making sure 

 no scrap wire remains in or around the discharge 

 tube or breech. 



Step 4. Take a canister from the packmg case, 

 and remove the white end cover. 



KNURLED END OF CANISTER 



BREECH CASTINGS 



W 



LAUNCH PIN SLOT 



Figure C-22. Loading canister In breech. 



Step 5. Insert canister in breech (fig. C-22) 

 guiding the probe launcli pin loop through the 

 launch pin slot until the knurled end is on the 

 breech castings. 



Step 6. Close breech and lock handle fully 

 counterclockwise. This will cause the red reload 

 light to go out at the recorder, and the chart 

 drive to run for approximately 2 seconds. Check 

 the chart paper to make sure that the "surface" 

 line appears directly under the stylus. To adjust 



C-12 



paper, turn knob (H) (fig. C-20) at lower left 

 of chart drive, ending with clockwise motion 

 to eliminate any backlash error. 



Step 7. When the green launch indicator sig- 

 nal (C) (fig. C-20) goes on, pull the probe 

 launch i^in by grasping the loop and removing 

 the pin with a firm continuous motion. NOTE: 

 If the sea is higli, try to deploy the probe so it 

 will hit the water between wave crests. 



Step 8. When the chart drive stops and the 

 red reload indicator signal goes on, annotate the 

 chart with the following information: ship, 

 ciiiise, latitude, longitude, time (GMT), day/ 

 month/year, e.g., 19/08/70, and consecutive 

 chart number. In addition, bottom depth should 

 be indicated beside the trace as shown in figure 

 C-23. 



Step 9. After the XBT observation is com- 

 pleted, charts may be left on the takeup spool in 

 the recorder or removed individually. To re- 

 move XBT chart (s) from the recorder, cut the 

 chart paper along the bottom of the chart paper 

 locking plate (F) (fig. C-20) with a penknife. 

 To reconnect the chart paper, attach the chart- 

 saver clip (G) (fig. C-20) to the chart paper by 

 stretching the clip elastic downward. 



Step 10. Secure XBT system by replacing 

 launcher canvas cover and disconnecting 

 recorder power cord. 



Step 11. Complete Bathythermograph Log in 

 accordance with instructions printed inside the 

 cover of the pad of log sheets. 



Step 12. If the XBT system will not be used 

 within the next 4 hours, unplug the recorder 

 power cord. 



C-16 Mailing XBT Charts and Logs.— At 



the completion of an operation, XBT charts and 

 logs should be mailed to a Fleet Weather Facil- 

 ity. Instructions for mailing XBT charts and 

 logs are printed inside the cover of each pad of 

 log sheets. 



Step 1. Cut charts (do not mail in a roll) so 

 that each consecutive observation includes the 

 baseline which was recorded above the surface 

 line of tlie chart when a new probe was loaded in 

 the launcher. 



Step 2. Mail charts and logs together, but do 

 not fold charts. Stack and mail flat. If pressure 

 sensitive chart i^aper was used, protect the 

 charts by folding each log sheet and inserting 

 the charts in the fold. 



Step 3. Include all checkout charts made at 

 the beginning of or during the operation with 

 the XBT charts and logs. 



C-17 XBT Maintenance.— XBT routine 

 and preventive maintenance and trouble shoot- 

 ing instructions are presented in manual R-467 

 A "Instructions for Installation, Operation and 

 Maintenance of Sippican Expendable Bathy- 



Change 1—1970 



