TM 1-1500-250-233-1Change 4CHAPTER 3TIE-DOWN PROCEDURES3-1.General Tie-Down Procedures. Line ten-sion tie-down lines from all main rotor blades shallbe taut, but care must be taken to ensure excessivedeflection of blades below the static jacking, droopposition, as stated in the specific aircraft -23 TMs,is not exceeded.3-2.Specific Aircraft Tie-Down.a.OH-58D tie-down blades as specified in the-23 Technical Manual and as shown in figure 3-1 ofthis general TM. Use the polyester rope referencedin this manual.b. OH-58A/C tie-down blades as specified inthe -23 Technical Manual and as shown in Figure3-2 of this general TM. Securely tie the straps of theboot to the polyester rope near the boot. Ensure theropes are long enough to cross and tie in the posi-tion illustrated. The forward blade shall be tied downusing the same boot strap/rope arrangement de-vice. The ropes shall be tied to the forward eyeboltsof the landing skid. The ropes, as an option, can besecured to the forward eyebolts of the landing skidby either tying or using a self closing hook that is thesame strength or as strong as the polyester rope, toanchor tie-down rope to the skid rings.NOTEOptional tie-down procedure for the OH-58A/Cis applicable also to the UH-1 and AH-1 aircraft.c.AH-64 tie-down blades as specified in the-23 Technical Manual and as shown in figure 3-3 ofthis general TM. Ensure that the main rotor bladetie-down boot is in good repair and that the two ny-lon end straps are securely attached (refer to figure3-3, blow-up). Replace the 3/8 inch nylon rope withpolyester rope. 3/8 inch diameter standard polyes-ter rope can be substituted directly. 1/2 inch diame-ter standard polyester rope can be secured to theboot by forming a small loop with the existing nylonrope and tying the polyester rope to the loop. En-sure that the rope is long enough to reach the properaircraft hardpoints. The right aft boot must have anadditional length of rope to secure to the aft out-board wing pylon sway brace or to secure to the aftwing store suspension lug. The other rope attachesto the aft jacking fitting at FS 450. This configurationwill prevent the boot from slipping off.d.UH-60 tie-down blades as specified in the-23 Technical Manual and as shown in figure 3-4 ofthis general TM. To prevent damage from the lockrelease cable in strong winds, wrap the cable sever-al times around the tie-down rope and slip the endloop through one of the cable wraps.e.AH-1 tie-down blades as specified in the -23Technical Manual and as shown in figure 3-5 of thisgeneral TM. Engage hook of main rotor tie-down inhole of fitting on each rotor blade and position bladeabove tailboom. Pul on tie-down to remove span-wise slack from the rotor system and secure rotorblade by wrapping the tie-down rope firmly aroundtailboom as shown in figure 3-5. Tie forward tie-down rope to tow rings, as shown in figure 3-5, onlanding gear skid. Additional security of main rotortie-down can be accomplished by inserting anAN416-2 safety retaining pin through a 0.060 inchhole drilled through the hook of the main rotor tie-down. The hole is drilled perpendicular to the planeof the handle, 0.25 inch from the insertion end of thehook. Secure the safety retaining pin to the hookhandle with a 6-inch piece of NAS1455B30-6Pchain and safety wire. Insert the safety retaining pinthrough the hook after inserting the hook throughthe rotor blade fitting. In the final tie-down position,the blades must be in a level position.f.UH-1 tie-down aft blades as specified in the-23 Technical Manual and as shown in figure 3-6 ofthis general TM. Engage hook of main rotor tie-down in hole of fitting on each rotor blade and posi-tion blade above tailboom. Pull on tie-down to re-move spanwise slack from the rotor system andsecure rotor blade by wrapping the tie-down ropefirmly around tailboom as shown in figure 3-6. Tieforward rope tie-down rope to tow rings, as shownin figure 3-6, on landing gear skid. Additional securi-ty of main rotor can be accomplished by inserting anAN416-2 safety retaining pin through a 0.060 inchhole drilled through the hook of the main rotor tie-down. The hole is drilled perpendicular to the planeof the handle, 0.25 inch from the insertion end of thehook. Secure the safety retaining pin to the hookhandle with a 6-inch piece of NAS1455B30-6Pchain and safety wire. Insert the safety retaining pinthrough the hook after inserting the hook throughthe rotor blade fitting. In the final tie-down position,the blades must not exceed 6 inches of additionaldroop from having been pulled down. This appliesto both metal and composite blades.g.CH-47 tie-down blades as specified in -23Technical Manual and figures 3-7 or 3-7a of thisgeneral TM. Use figure 3-7 for normal aircraft tie-down. As an option, the CH-47 blades may be se-cured to the mooring pad hardpoints, as shown infigure 3-7a, provided the aircraft is secured usingthe mooring procedures in this TM.
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