Главная Manuals FM 4-20.105 AIRDROP OF SUPPLIES AND EQUIPMENT: DUAL ROW AIRDROP SYSTEMS (SEPTEMBER 2003)
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C1, FM 4-20.105/TO 13C7-1-51
1
2
3
1
Remove the run back stop bar from its storage hole on the right rail. (Bar shown stowed.)
2
Insert the bar from the left side into the holes provided in both rails.
3
Secure the left end of the bar to the left rail with type III nylon cord.
Figure 6-11. Run Back Stop Bar Secured Across Breech
6-14
C1, FM 4-20.105/TO 13C7-1-51
4
3
2
5
1
2
1
Use 20d nails to nail five 2- by 8- by 40-inch pieces of lumber flush together.
2
Cut a 3/4- by 7 1/2- by 40-inch piece and a 1/2- by 7 1/2- by 40-inch piece of plywood. Nail
one piece flush to each side of the stack of boards.
Note: Be sure that the wood support fits snugly under the muzzle brake when the
latch bracket is in place. Adjust the plywood thickness, if necessary, to ensure a
snug fit.
3
Center the support on the trails under the muzzle brake. Align the rear edge of the support
with the edge of the muzzle brake.
4
Swing the latch bracket assembly up to the muzzle brake. Lock the latch bracket assembly
to the fitting on the muzzle brake.
5
Secure the latch bracket with type III nylon cord.
Figure 6-12. Muzzle Brake Support Constructed and Placed
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1
2
2
1
Run a 15-foot lashing from the front of the support, around the left trail, behind the
support, over the muzzle brake, in front of the support, under the right trail, and over the
muzzle brake. Secure it on the left side of the muzzle brake with a D-ring and a load
binder.
2
Beginning behind the support on the right side, run a 15-foot lashing under the right trail,
in front of the support, up over the muzzle brake, behind the support, under the left trail,
and over the muzzle brake. Secure it on the right side and behind the support with a D-
ring and a load binder.
Figure 6-13. Muzzle Brake Support Secured
6-16
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1
2
1
Wrap the aiming poles, trail lifting bar, rammer staff, and barrel brush with cellulose
wadding. Tie them to the rear ammunition box lashing with type III nylon cord.
2
Remove the traversing wheel (not shown). Secure it to its bracket on the left trail with type
III nylon cord.
Figure 6-14. Howitzer Equipment Stowed
6-17
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3
6
5
7
3
Cover the sights, and recoil springs with the covers provided.
4
Tie the jack and mallet in their storage bracket with type III nylon cord. (Not shown)
5
Tie the large firing stay cables to the rear firing platform hole with type III nylon cord.
6
Tie the smaller firing stay cables to the large firing stay cables with type III nylon cord.
7
Pad the rear side firing platform holes with 11- by 5-inch felt taped in place. Secure a
15-foot lashing through both holes, around the trails, and over the firing platform.
Figure 6-14. Howitzer Equipment Stowed (Continued)
6-18
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2
1
RIGHT
4
3
LEFT
1
Place a stack of three 25- by 36-inch pieces of honeycomb on the right side of the firing
platform against the gun tube.
2
Lay an 8- by 36-inch piece of felt against the barrel. Place the field spade against the felt.
3
Place a 25- by 36-inch piece of honeycomb lengthwise on the firing platform on the left side
of the gun tube.
4
Wrap the gunner’s sight box, tool bag, and camouflage net in the tarpaulin. Tie the bundle
securely with type III nylon cord, and place it on the honeycomb.
Figure 6-15. Howitzer Equipment Stowed on Firing Platform
6-19
C1, FM 4-20.105/TO 13C7-1-51
6
6
7
7
5
5
RIGHT
LEFT
5
Pad the remaining side firing platform lifting holes on the firing platform with two 5- by
11-inch pieces of felt.
6
Form two 30-foot lashings according to Chapter 3 of this manual. Lay a 30-foot lashing
diagonally across the items stowed on the firing platform. Pass one end through the field
spade hinge and firing platform lifting hole directly below, and around the right trail. Pass
the other end over the tarpaulin, down through the nearest firing platform lifting hole, and
around the left trail. Bring both free ends to the top of the load, and secure them over the
tarpaulin with two D-rings and a load binder.
7
Pass the end of another 30-foot lashing through the second field spade hinge and down
through the firing platform lifting hole directly below, and around the right trail. Pass the
other end over the tarpaulin, down through the remaining firing platform lifting hole, and
around the left trail. Bring both free ends to the top of the load, and secure them as in step
6.
Figure 6-15. Howitzer Equipment Stowed on Firing Platform (Continued)
6-20
C1, FM 4-20.105/TO 13C7-1-51
1
1
2
Notes: 1. All measurements are given in inches.
2. This drawing is not drawn to scale.
10
8
2
19
PLYWOOD (2 PIECES)
3/4 X 19 X 24
24
1
Center a 1/2- by 10 1/2- by 6-inch piece of plywood directly under the hinge of the traveling
stay. Center a 2- by 4- by 24-inch piece of lumber over the plywood.
2
Place a 3/4- by 19- by 24-inch piece of plywood with a 10- by 8-inch cutout on each side of the
piece of lumber. See the line drawing for details.
Note: Be sure that the wood support fits snugly between the traveling stay and the
carriage. Adjust the plywood thickness, if necessary, to ensure a snug fit.
Figure 6-16. Wood Under Buffer Assembly Secured
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3
3
Pad the front firing platform hole with cellulose wadding. Pass a 15-foot lashing through the
hole, over the lumber placed earlier, and around the brake light bar. Secure the lashing on
top with a D-ring and a load binder.
4
Repeat steps 2 and 3 on the left side, using the same firing platform hole. (Not shown)
5
5
Pass an A7A cargo strap around the barrel and under the buffer assembly. Secure the
strap with its friction adapter. Tie the excess strap with Type I,1/4-inch cotton webbing.
Figure 6-16. Wood Under Buffer Assembly Secured (Continued)
6-22
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1
1
Tie the brake lines to the brake handle with type III nylon cord.
2
Secure all levers and pins with type III nylon cord (not shown).
Figure 6-17. Brake Lines Secured to Brake Handle
2
1
1
Cut seven 36- by 70-inch pieces of honeycomb. Center a cutout in three of the pieces to fit
the collimator. Glue the three pieces with the cutouts flush over two solid piece of honey
comb.
2
Pad the collimator generously with cellulose wadding, tape, and place it in the collimator
box.
3
Glue the remaining two pieces of honeycomb together. Center and glue on top of the five
pieces of honeycomb containing the collimator (not shown).
Figure 6-18. Collimator Stowed
6-23
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2
1
RIGHT
4
3
LEFT
1
Cut four 5- by 10-inch pieces of honeycomb. Glue two pieces together to form two stacks.
Glue the two pieces on top of the right corners of the honeycomb on top of the firing
platform.
2
Center the collimator box across the gun tube and the firing platform. Cut and place a 36-
inch by 70-inch piece of 3/4-inch plywood on top of the collimator box.
3
Route a lashing through the left front firing platform lifting hole, around the trail, and
through its own D-ring. Repeat for the right front side and secure the running ends
together on top of the collimator box with two D-rings and a load binder.
4
Route a lashing through the left rear firing platform lifting hole, around the trail, and
through its own D-ring. Repeat for the right rear side and secure the running ends
together on top of the collimator box with two D-rings and a load binder.
Figure 6-19. Collimator Box Secured to Load
6-24
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LIFTING AND POSITIONING HOWITZER
6-6. Lift the howitzer and position it on the honeycomb stacks as shown in
Figure 6-20.
2
1
1
3
REAR
FRONT
1
Wrap 10,000-pound chains around the wheel hubs, and run a 10,000-pound chain through
the lunette.
2
Attach hooks to the ends of three 11-foot (2-loop), type XXVI nylon slings, and hook the
slings to the chains. Adjust the chains, as necessary, to ensure that the howitzer remains
level when lifted.
Note: The hooks shown are not standard items. Other hooks available at the rigging
facility may be used.
3
Center the howitzer on the platform, and on the stacks as shown.
Figure 6-20. Howitzer Lifted and Positioned on Platform
6-25
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STOWING FUSE BOXES
6-7. Stow six fuse boxes on the back of the platform as shown in Figure 6-21.
6
5
7
4
7
4
3
A8
B9
2
REAR
A9
1
Preposition a lashing across the platform centered between deck rings A8 and A9. (Not
shown)
2
Form two layers of 12- by 25-inch honeycomb as the base and center them between deck
rings A and B.
3
Place three fuse boxes on top of the layers with two pieces of 7- by 12-inch honeycomb as
inserts.
4
Place another layer of 12- by 25-inch honeycomb on top of the fuses and place three more
boxes of fuses with two pieces of 7- by 12-inch honeycomb as inserts.
5
Place a final layer of 12- by 25-inch honeycomb on top of the fuses.
6
Place a 3/4- by 12- by 25-inch piece of plywood on top of the honeycomb to complete the
stack.
7
Secure the stack with four pieces of 1/2-inch tubular nylon. Route the prepositioned lashing
lengthwise around the stack and secure with a D-ring and load binder on the right side of
the fuse box stack.
Figure 6-21. Fuse Boxes Stowed
6-26
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9
8
A8
B9
REAR
A9
8
Route a lashing through deck ring A9, over the stack, through deck ring B8, and back over
the stack toward A9. Secure with a D-ring and load binder.
9
Route a lashing through deck ring B9, over the stack, through deck ring A8, and back over
the stack toward B9. Secure with a D-ring and load binder.
Figure 6-21. Fuse Boxes Stowed (Continued)
6-27
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BUILDING AND PLACING THE ATTITUDE CONTROL SYSTEM (ACS)
BRIDGE SUPPORT
6-8. Build the ACS bridge support as shown in Figure 6-22. Place the ACS
bridge support on the load as shown in Figure 6-23.
Note: All measurements are given in inches.
1
TWO PIECES
5 X 30
THREE PIECES
10 X 30
ONE PIECE
3/4 X 36 X 67
PLYWOOD
2
ONE PIECE
36 X 67
SEVEN PIECES
16 X 36
TWO PIECES
10 X 36
1
Build two honeycomb stacks to be placed next to the wheels of the howitzer as shown above.
2
Build one honeycomb stack to be placed on top of the stacks built in step 1.
Figure 6-22. ACS Bridge Support Stacks Built
6-28
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1
2
3
1
Place the two smaller honeycomb stacks previously built next to the inside of each wheel.
2
Place the larger stack on top of the stacks in step 1.
3
Form a 30-foot lashing and route the free ends around the wheel hubs and secure on top
with two D-rings and a load binder.
Figure 6-23. ACS Bridge Support Stacks Placed on Load
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LASHING HOWITZER
6-9. Lash the howitzer to the platform as shown in Figures 6-24 and 6-25.
Install and safety the lashings according to Chapter 3 of this manual.
1A
3
1
FRONT
2
1
Lashing
Tiedow n
Instruction s
Number
Clevis Numbe r
Pass lashing :
1
1
Through lunette, right side
2
1A
Through lunette, left side
3
2
Through hole in firing platform and around trail, right side
4
2A
Through hole in firing platform and around trail, left side
Figure 6-24. Lashings 1 through 4 Installed
6-30
C1, FM 4-20.105/TO 13C7-1-51
9
11
5
7
27
25
22
21
Lashing
Tiedow n
Instructions
Number
Clevis Number
Pass lashing :
5
21
Through hole in firing platform and around
t
6
21A
Through hole in firing platform and around
t
7
22
Around the arm, near the
t
8
22A
Around the arm, near the
t
9
25
Around
t
10
25A
Around
t
11
27
Around rail, right side
12
27A
Around rail, left side
Figure 6-25. Lashings 5 through 12 Installed
6-31
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INSTALLING ACS AND SUSPENSION SLINGS
6-10. Construct, inspect, and position the ACS according to Chapter 3, and as
shown in Figure 6-26. Install the suspension slings and secure ACS according to
Chapter 3, and as shown in Figure 6-27.
2
1
FRONT
REAR
1
Center the front ACS flush to the front of the honeycomb stack containing the collimator.
The ACS 4- by 4-inch lumber must face the rear of the platform.
2
Center the rear ACS on the rear ACS support stacks in the middle with the 4- by 4-inch
lumber facing the front of the platform.
CAUTION
Ensure the ACS is centered on the load
Figure 6-26. Attitude Control System Positioned
6-32
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3
1
2
10
7
1
Install a 3-foot (4-loop), type XXVI nylon sling to clevises 7 and 10. Connect an 11-foot
(4-loop), type XXVI nylon sling to the center of the 3-foot sling with a 3 3/4-inch two point
link.
2
Route the sling through the clevis on the ACS from front to rear. Pad and tape the 11-foot
sling with felt from a point 6 inches below the clevis to a point 6 inches above the top of the
ACS.
3
Safety tie the 3 3/4-inch two-point link to the ACS clevis with a loop of type III nylon cord.
Ensure the tie is tight.
4
Install a 3-foot (4-loop), type XXVI nylon sling to the other end of the 11-foot sling with a 3
3/4-inch two point link. Pad and tape the link with felt (not shown). See Chapter 3.
5
Repeat steps 1 through 4 on the left side of load using clevises 7A and 10A.
Figure 6-27. Slings Installed and ACS Secured
6-33
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6
7
8
20
5
3
6
Route a 30-foot lashing from clevis 5 through right ACS clevis from front to rear, around
the ACS 4- by 4-inch lumber and back to clevis 5.
7
Repeat above step using clevis 3.
8
Route a 30-foot lashing from clevis 20 through right ACS clevis from rear to front, around
the ACS 4- by 4-inch lumber and back to clevis 20.
9
Repeat steps 6 through 8 on the left side of load using clevises 3A, 5A, and 20A (not
shown).
10
Ensure the ACS is straight and centered on load. Load binders on both sides of the load
must be closed at the same time in the following sequence: 5 and 5A, 3 and 3A, 20 and
20A.
Figure 6-27. Slings Installed and ACS Secured (Continued)
6-34
C1, FM 4-20.105/TO 13C7-1-51
13
11
12
24
23
11
Install a 3-foot (4-loop), type XXVI nylon sling to clevises 23 and 24. Connect an 11-foot
(4-loop), type XXVI nylon sling to the center of the 3-foot sling with a 3 3/4-inch two point
link.
12
Route the sling through the clevis on the ACS from rear to front. Pad and tape the 11-foot
sling with felt from a point 6 inches below the clevis to a point 6 inches above the top of the
ACS.
13
Safety tie the 3 3/4-inch two point link to the ACS clevis with a loop of type III nylon cord.
Ensure the tie is tight.
14
Install a 3-foot (4-loop), type XXVI nylon sling to the other end of the 11-foot sling with a
3 3/4-inch two point link. Pad and tape the link (not shown). See Chapter 3.
15
Repeat steps 11 through 13 on the left side using clevises 23A and 24A. (Not shown)
Figure 6-27. Slings Installed and ACS Secured (Continued)
6-35
C1, FM 4-20.105/TO 13C7-1-51
20
19
17
16
26
19
16
Route a 30-foot lashing from clevis 19 through right rear ACS clevis from outside to inside,
rear to front, around the ACS 4- by 4-inch lumber and back to clevis 19.
17
Route a lashing from clevis 26 through right rear ACS clevis from outside to inside, front to
rear, around ACS 4- by 4-inch lumber and back to clevis 26.
18
Repeat steps 16 through 17 on the left side of the load. (Not shown)
19
Remove all slack from the slings. Tie a length of type III nylon cord around the 11-foot
sling and the ACS sling. Refer to Chapter 3, Figure 3-2 for detailed view.
20
Tie a length of type III nylon cord around the 11-foot nylon sling, behind all lashings, and
the 4- by 4-inch lumber of the ACS and tie the ends together. Refer to Chapter 3, Figure 3-2
for detailed view.
21
Repeat steps 19 and 20 on all slings. (Not shown)
Figure 6-27. Slings Installed and ACS Secured (Continued)
6-36
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INSTALLING OUTRIGGER ASSEMBLIES
6-11. Assemble, install, and safety tie the mast and foot assemblies on the DRAS
platform according to TM 10-1670-268-20&P/TO 13C7-52-22 and as shown in
Chapter 3, Figures 3-33 through 3-35 and Figure 3-36 steps 1, 2, and 3.
STOWING CARGO PARACHUTES
6-12. Prepare the parachute stowage platform, stow, and restrain three G-11D
cargo parachutes on top of the stowage platform as shown in Chapter 3 and as
shown in Figure 6-28.
Notes: 1. All measurements are given in inches.
2. This drawing is not drawn to scale.
3. 8d common wire nails must be used to join the individual pieces.
FRONT
70
1
24
2
48
PLYWOOD
3
(3/4 X 48 X 70)
2
2
REAR
1
1
Nail a 2- by 6- by 70-inch piece of lumber flush with the front and rear edges of a 3/4- by 48-
by 70-inch piece of plywood.
2
Nail a 2- by 6- by 37-inch piece of lumber to each side of the plywood as shown.
3
Make three 2-inch holes in each 48-inch side of the platform as shown.
Figure 6-28. Parachute Stowage Platform Constructed and Cargo Parachutes Stowed
6-37
C1, FM 4-20.105/TO 13C7-1-51
7
6
7
5
4
4
13
FRONT
6
4
Set two stacks of 18 layers each of 17- by 20-inch honeycomb flush against each side of
stack 1 and the front of the platform.
5
Set two stacks of 9 layers each of 10- by 10-inch honeycomb on top of the first stack of
ammunition.
6
Set three 70- by 36-inch pieces of honeycomb on top of the four stacks flush with the front
and sides. Ensure that the 10- by 10-inch honeycomb stacks are flush with the rear and
sides of the top three pieces.
7
Center the parachute stowage platform on the honeycomb stacks. Lash the parachute
stowage platform to clevises 6 and 6A and clevises 13 and 13A.
Figure 6-28. Parachute Stowage Platform Constructed and Cargo Parachutes Stowed (Continued)
6-38
C1, FM 4-20.105/TO 13C7-1-51
8
9
FRONT
15
8
8
Prepare and install three G-11D cargo parachutes on top of the stowage platform as shown
above and in Chapter 3.
9
Restrain the parachutes using type VIII nylon webbing tied to clevises 8, 8A, 15, and 15A.
Figure 6-28. Parachute Stowage Platform Constructed and Cargo Parachutes Stowed (Continued)
6-39
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STOWING DEPLOYMENT PARACHUTE
6-13. Prepare, stow, and install the deployment parachute according to Chapter
3, Section IV and as shown in Figure 6-29.
1
1
Prepare, stow, and install the deployment parachute according to Chapter 3,
Section IV and as shown above.
Figure 6-29. Deployment Parachute Installed
6-40
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INSTALLING PARACHUTE RELEASE SYSTEM
6-14. Build an M-1 parachute release stack. Prepare and install an M-1 release
system according to Chapter 3, Section V and as shown in Figure 6-30.
1
2
2
1
Cut three 20- by 15-inch pieces of honeycomb and glue together to form the M-1 release
parachute stack. Tape the top edges of the honeycomb. Center the stack against the front
edge of the rear ACS and secure it with type III nylon cord. Place the M-1 release on the
support stack.
2
Attach riser extensions and suspension slings to the M-1 release.
Note: Remove the buffers from the ends of the suspension slings that attach to the
M-1 release.
3
Group the riser extensions together and tie, equally spaced, with type I, 1/4-inch cotton
webbing making three ties (not shown). S-fold the slack in the front and rear suspension
slings on top of the rear ACS according to Chapter 3 of this manual.
Figure 6-30. Parachute Release System Installed
6-41
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INSTALLING MAST RELEASE KNIVES
6-15. Install the mast release knives according to Chapter 3, Figure 3-36,
Steps 4 through 10 and as shown in Figure 6-31.
2
1
1
1
The lengths of the left and right 1/2-inch tubular nylon webbing from the base of the
guillotine knives to the lower suspension links of the M-1 release is 59 inches as shown in
steps 5 and 6 of Figure 3-36.
2
Tie a length of type III nylon cord through the left part of the gun and to the body of
the right top guillotine knife that measures 58-inches from the trunnion (hole) of the
equilibrator arm to the base of the guillotine knife. Repeat for the right part of the gun and
left lower guillotine knife as shown in steps 9 and 10 of Figure 3-36.
Note: All measurements are from knot to knot.
Figure 6-31. Mast Release Knives Installed
6-42
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MARKING RIGGED LOAD
6-16. Mark the rigged load according to Chapter 3 and as shown in Figure 6-32.
A Shipper’s Declaration for Dangerous Goods is required.
EQUIPMENT REQUIRED
6-17. The equipment required to rig this load is listed in Table 6-1.
CAUTION
Make the final rigger inspection required by Chapter 3 of this manual
before the load leaves the rigging site.
CB
RIGGED LOAD
Weight Load shown
11,200 pounds
Maximum weight
11,300 pounds
Height
98 inches
Width
94 inches
Length
220 inches
Center of Balance (from front edge of platform)
94 inches
Figure 6-32. M119 Howitzer and Accompanying Ammunition Rigged for Dual Row Airdrop
6-43
C1, FM 4-20.105/TO 13C7-1-51
Table 6-1. Equipment Required for Rigging M119 Howitzer and Accompanying Ammunition for
Dual Row Airdrop
National Stock
Item
Quantity
Number
8040-00-273-8713
Adhesive paste, 1-gal
required
4020-00-240-2146
Cord, nylon, type III, 550-lb
As required
4030-00-090-5354
Clevis, large
5
4030-00-678-8562
Clevis, medium
4
Link assembly:
Two-point, 3 3/4-in
9
5306-00-435-8994
Bolt, 1-in diam, 4-in long
18
5310-00-232-5165
Nut, 1-in, hexagonal
18
1670-00-003-1953
Plate, side, 3 3/4-in
18
5365-00-007-3414
Spacer, large
18
Lumber:
5510-00-220-6146
2- by 4-in
As required
5510-00-220-6148
2- by 6-in
As required
5510-00-220-6274
4- by 4-in
As required
5530-00-618-8073
Plywood, 3/4-in
6 sheets
5315-00-010-4659
Nail, steel wire, common, 8d
As required
1670-00-753-3928
Pad, energy dissipating, honeycomb, 3- by 36- by 96-in
24 Sheets
1670-01-487-5461
Staticline assembly release away
1
Parachute:
Cargo:
1670-01-016-7841
G-11D
3
Cargo extraction: (Deployment Parachute)
1670-00-040-8135
28-foot
1
Platform, Dual Row, 18-foot
Rail, DRAS
2
Roller Pad, DRAS
4
Panel Assembly, Main
9
1670-01-162-2372
Clevis assembly
56
1670-01-097-8816
Release, cargo parachute, M-1
1
6-44
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Table 6-1. Equipment Required for Rigging M119 Howitzer and Accompanying Ammunition for
Dual Row Airdrop (Continued)
National Stock
Item
Quantity
Number
Sling, cargo airdrop
For suspension:
1670-01-062-6310
11-ft (4-loop), type XXVI nylon webbing
4
1670-01-062-6306
3-ft (4-loop), type XXVI nylon webbing
8
For deployment:
1670-01-062-6306
3-ft (4-loop), type XXVI nylon webbing
1
For riser extention:
1670-01-062-6313
60-ft (3-loop), type XXVI nylon webbing
2
For ACS:
1670-01-063-7761
16-ft (2-loop), type XXVI nylon webbing
2
For lifting:
1670-01-062-6303
11-ft (2-loop), type XXVI nylon webbing
4
1670-00-040-8219
Strap, parachute release, multicut
2
1670-00-937-0271
Knife release,cargo (guillotine)
2
1670-01-487-5464
Outrigger assembly
2
7510-00-266-5016
Tape, adhesive, 2-in
As required
1670-00-937-0271
Tie-down assembly, 15-ft
58
1670-00-725-1437
Tie-down, Cargo, Aircraft, (CGU-1B)
1
Webbing:
8305-00-268-2411
Cotton, 1/4-in, type I
As required
Nylon:
8305-00-082-5752
Tubular, 1/2-in
As required
8305-00-263-3591
Type VIII
8 yds
6-45
FM 4-20.105/TO 13C7-1-51
Table 7-1. Equipment Required for Rigging the M101A1 or M101A2, 3/4-ton Cargo Trailer
with Accompanying Ammunition Load on a Dual Row Platform for Dual Row Airdrop
National Stock
Item
Quantity
Number
8040-00-273-8713
Adhesive paste, 1-gal
As required
4020-00-240-2146
Cord, nylon, type III, 550-lb
As required
4030-00-090-5354
Clevis, large
5
4030-00-678-8562
Clevis, medium
4
Link assembly:
Two-point, 3 3/4-in
9
5306-00-435-8994
Bolt, 1-in diam, 4-in long
18
5310-00-232-5165
Nut, 1-in, hexagonal
18
1670-00-003-1953
Plate, side, 3 3/4-in
18
5365-00-007-3414
Spacer, large
18
Lumber:
5510-00-220-6146
2- by 4-in
As required
5510-00-220-6148
2- by 6-in
As required
5510-00-220-6274
4- by 4-in
As required
5530-00-618-8073
Plywood, 3/4-in
2 sheets
5315-00-010-4659
Nail, steel wire, common, 8d
As required
1670-00-753-3928
Pad, energy dissipating, honeycomb,
3- by
36- by
96-in
20 Sheets
1670-01-487-5461
Static line assembly release awa y
1
Parachute:
Cargo:
1670-01-016-7841
G-11 D
2
Cargo extraction:
1670-00-040-8135
28-foot (Deployment parachute)
1
Platform, Dual Row, 18-foot:
1670-01-485-1654
Rail, DRA S
2
1670-01-486-1342
Roller Pad, DRA S
4
1670-01-486-1656
Panel Assembly, Main
9
1670-01-162-2372
Clevis assembly
46
1670-01-097-8816
Release, cargo parachute, M-1
1
7-46
FM 4-20.105/TO 13C7-1-51
Table 7-1. Equipment Required for Rigging the M101A1 or M101A2, 3/4-ton Cargo Trailer
with Accompanying Ammunition Load on a Dual Row Platform for Dual Row Airdrop
(continued)
National Stock
Ite m
Quantity
Number
Sling, cargo airdrop
For suspension:
1670-01-062-6310
11-ft (4-loop), type XXVI nylon webbing
4
1670-01-062-6306
3-ft (4-loop), type XXVI nylon webbin g
8
For deployment:
1670-01-062-6306
3-ft (4-loop), type XXVI nylon webbin g
1
For riser extension
:
1670-01-062-6313
60-ft (3-loop), type XXVI nylon webbing
2
For AC
S:
1670-01-063-7761
16-ft (2-loop), type XXVI nylon webbing
2
For lifting
:
1670-01-062-6301
3-ft (2-loop), type XXVI nylon webbin g
1
1670-01-062-6303
12-ft (2-loop), type XXVI nylon webbing
3
1670-00-040-8219
Strap, parachute release, multicu t
2
1670-00-937-0271
Knife release, cargo (guillotine
)
2
1670-01-487-5464
Outrigger assembly
2
7510-00-266-5016
Tape, adhesive, 2-in
As required
1670-00-937-0271
Tie-down assembly, 15-ft
60
1670-00-725-1437
Tie-down, cargo, aircraft (CGU-1B
)
5
Webbing:
8305-00-268-2411
Cotton, 1/4-in, type I
As required
Nylon:
8305-00-082-5752
Tubular, 1/2-in
As required
8305-00-263-3591
Type VIII
As required
7-47
FM 4-20.105/TO 13C7-1-51
APPENDIX A
VERIFYING THE CENTER OF BALANCE ON A DRAS PLATFORM LOAD
VERIFYING THE CENTER OF BALANCE
A-1. The center of balance (CB) of a DRAS load must be verified and marked on
each side of the platform. The pole method and the calculation method are two
ways of verifying the CB. The instructions for these methods are given in
Figures A-1 and A-2.
2
1
2
4
3
1
Mark the CB range on the side of the platform by placing a piece of adhesive tape 85 inches
from the front of the platform and another piece of adhesive tape 99 inches from the front of
the platform.
2
Make a lift kit by placing four 11-foot (4-loop), Type XXVI nylon slings on a large clevis.
Attach the lift kit sling legs to the 3-foot suspension slings on the front and rear of the
platform with medium clevises (if additional length is required add a second medium clevis
through the first medium clevis). Ensure the lift kit slings are routed to the front of the
front ACS and to the rear of the rear ACS.
3
Raise the load and place a pipe or pole (minimum length of 8 feet and minimum diameter of
6 inches) under the load, perpendicular to the platform, in the CB range.
4
When the load balances, mark the CB on both sides of the platform.
NOTE: The center of balance MUST be within the CB range of 85 - 99 inches
from the front of the platform.
Figure A-1. Verifying CB Using the Pole Method
A-1
FM 4-20.105/TO 13C7-1-51
NOTE: Use the lift kit and instructions
in Step 2 of Figure A-1 to
lift the load.
FRONT
REAR
7
CB
SCALES
L x RW
6
= CB in inches from front edge of platform
TW
216 inches x 4,162 lbs
= 86 inxhes from front edge of platform
10,455 lbs
C = 2,081 lbs
A = 3,147 lbs
C + D = RW
REAR
FRONT
3
1
A + B = FW
2
2,081 + 2,081 = 4,162 lbs
3,147 + 3,146 = 6,293 lbs
4
FW + RW = TW
6,293 + 4,162 = 10,455 lbs
D= 2,081 lbs
B = 3,146 lbs
L
216 inches
5
Figure A-2. Verifying CB Using the Calculation Method
A-2
FM 4-20.105/TO 13C7-1-51
1
Place a portable scale under each corner of the DRAS platform. Label the front scales A
and B and the rear scales C and D. Place the scales the same distance from the front and
rear edge of the platform on both sides.
2
Add the weights of the front scales together (A + B = FW) ( FW = Front Weight).
3
Add the weights of the rear scales together (C + D = RW) ( RW = Rear Weight).
4
Add the front weight (FW) and the rear weight (RW) together. This equals the total weight
(FW + RW = TW) (TW = Total Weight).
5
Measure the distance in inches between the center of the front scale and the center of the
rear scale. This equals the length (Length = L).
6
Multiply the length (L) by the rear weight (RW) and divide by the total weight (TW). This
equals the center of balance (CB) in inches from the front edge of the platform.
7
Mark the CB on both sides of the platform.
NOTE: The center of balance MUST be within the CB range of 85 - 99 inches
from the front of the platform.
Figure A-2. Verifying CB Using the Calculation Method (continued)
A-3
FM 4-20.105/TO 13C7-1-51
GLOSSARY
ACS
attitude control system
AD
airdrop
AFB
Air Force base
AFJMAN
Air Force Joint Manual
AFR
Air Force regulation
AFTO
Air Force technical order
ALC
Airlift Logistics Center
AGL
above ground level
attn
attention
CB
center of balance
chap
chapter
d
penny
DA
Department of the Army
DC
District of Columbia
DD
Department of Defense
diam
diameter
DRAS
dual row airdrop system
fig
figure
FM
field manual
ft
foot/feet
gal
gallon
HMMWV
high mobility multipurpose wheeled vehicle
HQ
headquarters
in
inch
JAI
joint airdrop inspector
lb
pound
MAJCOM
Major Command
LV
low-velocity
LVOSS
Light Vehicle Obscruation Smoke System
MCRP
Marine Corps Reference Publication
mm
millimeter
NSN
national stock number
OVE
on-vehicular equipment
PFA
platform fitting assembly
TM
technical manual
TO
technical order
TRADOC
US Army Training and Doctrine Command
US
United States
wt
weight
w
with
w/o
without
yd
yard
Glossary-1
C1, FM 4-20.105/TO 13C7-1-51
REFERENCES
AFJMAN 24-204(I)/TM 38-250/NAVSUP PUB 505/MCOP4030. Preparing Hazardous
Materials for Military Air Shipments. 11 December 2001.
FM 10-500-53/MCRP/TO 13C7-18-41. Airdrop of Supplies and Equipment: Rigging
Ammunition. (C1) 24 July 2000.
TM 9-2320-280-10/TO 36A12-1A-2091-1/TM 2320-10/6A. Truck, Utility: Cargo/Troop
Carrier, 1 1/4-Ton, 4X4, M998 (2320-01-107-7155). 18 June 1991.
TM 9-2330-202-14&P. Operator's, Organizational, Direct Support and General Support
Maintenance Manual Including Repair Parts and Special Tools List for Trailer, Cargo.
10 August 1983.
TM 10-1670-268-20&P/MCRP 4-3.8/TO 13C7-52-22. Organizational Maintenance Manual
With Repair Parts and Special Tools List: Type V Airdrop Platform and Dual Row Airdrop
Platform. 15 September 2002.
TM 10-1670-277-23&P/TO 13C5-28-2/NAVAIR 13-1-30. Unit and Direct Support (DS)
Maintenance Manual (Including Repair Parts and Special Tools List) for Parachute, Cargo
Type: 28-Foot Diameter, Cargo Extraction Parachute NSN 1670-01-262-1797 and NSN
1670-00-040-8135, 5 August 1991.
TM 10-1670-280-23&P/TO 13C5-31-2/NAVAIR 13-1-31. Unit and Intermediate Direct
Support (DS) Maintenance Manual (Including Repair Parts and Special Tools List) for
Parachute, Cargo Type: 100-Foot Diameter, G-11B, G-11C and G-11D,
(NSN 1670-01-016-7841). 15 September 2002.
TM 10-1670-296-20&P/TO 13C7-49-2. Unit Maintenance Manual Including Repair Parts
and Special Tools List for Ancillary Equipment for Low Velocity Airdrop System.
30 October 2002.
AFTO Form 22. Technical Order Publication Improvement Report
DA Form 2028. Recommended Changes to Publication and Blank Forms. February 1974.
DD Form 1748 Series Joint Airdrop Inspection Record
Shipper’s Declaration for Dangerous Goods. Locally procured form.
References-1
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