APPENDIX B 

 MAINTENANCE AND OPERATION GUIDELINES 



The following sections provide maintenance, inspection, and operating guidelines 

 for the CDT depressor equipment. 



EQUIPMENT INSPECTION AND MAINTENANCE 



The depressor should be inspected visually after retrieval and prior to launch- 

 ing to ensure that there is no damage. Some hairline cracks may appear at the wing/ 

 fuselage junction. This indicates that the surface paint has cracked due to flexure 

 of the wings during towing and is of little concern. Paint also may chip away at 

 various surface locations on the depressor. This is of no real concern unless it 

 occurs on the convex surface of the wing, particularly near the leading edge. If 

 large areas of paint chip away on this surface, hydrodynamic performance, primarily 

 lateral trim, can be adversely affected. The wing surface should be kept relatively 

 smooth by sanding and refinishing as required. 



Screws and bolts should be checked frequently to ensure that they are tight. If 

 any screws have loosened, they should be cleaned, coated with "lock tite," and rein- 

 serted (self-locking screws can be used in lieu of lock tite). The roll-pin which 

 secures the roll-trim pendulum also should be checked periodically. If the roll-pin 

 has worked loose, it should be replaced. Also, the roll-trim tab should be exercised 

 before the depressor is launched to ensure that it pivots freely. If the roll tab 

 is not operating properly, it will adversely affect depressor performance. 



Although not necessarily required, all aluminum hardware should be washed with 

 freshwater after daily towing operation to remove salt buildup and to retard cor- 

 rosion. If the equipment is to be put into storage for an extended period a 

 thorough washing with freshwater is highly recommended. 



Whenever a pressure housing is disassembled, the 0-ring and 0-ring contact sur- 

 faces should be cleaned and inspected for nicks; ideally the 0-ring should be re- 

 placed. 0-ring surfaces must be recoated with silicone grease or a similar nonwater- 

 soluable grease during assembly. 



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