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 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：UH-60Q 直升机技术手册 直升机操作手册 2(11)
