d.
Determine the CG of the fully-loaded helicopter from Figures 6-9 and 6-10, and if the CG of the helicopter falls within allowable limits. If it does, the cargo can be loaded. If not, the planned location of the individual items must be changed until an acceptable loading plan is obtained. When cargo loads consists of more than one item, the heavier items of cargo should be placed so that their CG is about in the center of the cabin, and the lighter items of cargo are forward and rear of them.

6.18.3 Restraint Criteria. The amount of restraint that must be used to keep the cargo from moving in any direc-tion is called the 9restraint criteria9 and is usually expressed in units of the force of gravity, of Gs. Following are the units of the force of gravity or Gs needed to restrain cargo in four directions:
Cargo 
Forward  12 Gs 
Rear  3 Gs 
Lateral  8 Gs 
Vertical  3 Gs (Up) 
3 Gs (Down) 

STA 379.0
LOOKING TO THE FRONT

353025201510 5

5 101520253035

TIEDOWN FITTING 5000 POUNDS CAPACITY
MAXIMUM COMPARTMENT CAPACITY IN POUNDS  FLOOR CAPACITY POUNDS PER SQUARE FOOT 

 5460  300 

 8370  300 

AB1088
SA

250 255 260 265 270 275 280
285
COMPARTMENT C

COMPARTMENT D

COMPARTMENT E

290 295 300 305 310 315 320 325 330 335 340
345 350 355 360 365 370 375 380 385 390 395

Section VII CENTER OF GRAVITY
6.20 CENTER OF GRAVITY LIMITS CHART.
The CG limit charts (Figures 6-8 and 6-9) allow the center of gravity (inches) to be determined when the total weight and total moment are known.
CENTER OF GRAVITY
WITHOUT EXTERNAL STORES SUPPORT SYSTEM 11,500 TO 16,500 POUNDS GROSS WEIGHT CENTER OF GRAVITY LIMITS
MAIN ROTOR L 345.8 364.2
EXAMPLE C
WANTED
DETERMINE IF LOADING LIMITS ARE EXCEEDED
KNOWN
GROSS WEIGHT = 15,000 POUNDS MOMENT / 1000 =5,400
METHOD
ENTER GROSS WEIGHT AT 15,000 POUNDS. MOVE RIGHT TOTAL MOMENT / 1,000 = 5,400 CG IS WITHIN LIMITS MOVE DOWN TO ARM = 360
LEGEND
BEYOND LIMITS

DATA BASIS: CALCULATED AB0833_1
SA

CENTER OF GRAVITY
WITHOUT EXTERNAL STORES SUPPORT SYSTEM 16,000 TO 22,000 POUNDS GROSS WEIGHT CENTER OF GRAVITY LIMITS
MAXIMUM GROSS WEIGHT. 22 SEE CHAPTER 5 FOR DETAILS.
21
20
19
18
17
16.5
16
GROSS WEIGHT ~ 1000 POUNDS

LEGEND  335  340  345  350 355 ARM ~ INCHES  360  365  370 
BEYOND LIMITS 
DATA BASIS:  CALCULATED  SA AB0831_2 

CENTER OF GRAVITY

WITH EXTERNAL STORES SUPPORT SYSTEM INSTALLED

11,500 TO 16,500 POUNDS GROSS WEIGHT
CENTER OF GRAVITY LIMITS

MAIN ROTOR C
364.2
L

335 340 345 350 355 360 365 370

ARM ~ INCHES
LEGEND 
BEYOND LIMITS 

DATA BASIS: CALCULATED
AA1254_1A

SA 
Figure 6-9. Center of Gravity Limits Chart (Sheet 1 of 2) 
6-18 

TM 1-1520-253-10

CENTER OF GRAVITY
WITH EXTERNAL STORES SUPPORT SYSTEM INSTALLED

16,000 TO 22,000 POUNDS GROSS WEIGHT
CENTER OF GRAVITY LIMITS

MAIN ROTOR C
L

343.0 360.2
22
21
20
19
18
17
LEGEND
16
BEYOND LIMITS

335 340 345 350 355 360 365 370
ARM ~ INCHES
DATA BASIS:CALCULATED
FK1328_2
SA
GROSS WEIGHT ~ 1000 POUNDS
6-19/(6-20 Blank)

CHAPTER 7

PERFORMANCE DATA

Section I INTRODUCTION
　
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