2-30-5
CALCULATING THE REW (RECOVERABLE EMPTY WEIGHT), THE NRW (NET RECOVERABLE WEIGHT) AND THE CENTER OF GRAVITY
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Figure 2-12 MAJOR COMPONENTS, WEIGHT A ND CENTER OF GRAVI TY (Continued)
COMPONENT UNIT WEIGHT MOMENT ARM
POUNDS KG INCHES CM
POTABLE WATER TANK 447 202.7 1,671.0 4244
PASSENGER ACCOMODATIONS SEATS (ALL TYPES) *[3]
*[1] 40 GALLONS CANNOT BE USED
*[2] 5 GALLONS CANNOT BE USED
*[3] PASSENGER SEATS ARE SUPPLIED BY THE CUSTOMER, HENCE WEIGHTS WILL CHANGE. REFER TO SPECIFIC AIRPLANE CONFIGURATION TO FIND THE TOTAL WEIGHT OF THE SEATS.
2-30-5
CALCULATING THE REW (RECOVERABLE EMPTY WEIGHT), THE NRW (NET RECOVERABLE WEIGHT) AND
THE CENTER OF GRAVITY
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757 AIRPLANE RECOVERY DOCUMENT 2-30-6 Location of Center of Gravity (CG) in Percent of Mean Aerodynamic Chord (MAC)
1. You calculate the location of the CG in a relation to the MAC (Mean Aerodynamic Chord) as follows:
Percent MAC = (ARM) CG Station -991.9 X 100
199.7
2. Where: Percent MAC = Location of CG in Percent of the MAC CG Station = Station location of CG (inches)
199.7 = Width of MAC (inches)
991.9 = Distance of MAC leading edge to Sta 0 (inches)
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LOCATION OF CENTER OF GRAVITY (CG) IN PERCENT OF MEAN AERODYNAMIC CHORD (MAC) Page 2-37 Jul 01/2005
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2-40 REMOVAL OF PAYLOAD 2-40-1 General
1.
The airplane will frequently be in an unusual attitude during the start of a recovery. Make sure you tell all the persons about the risks from a sudden load movement while you remove the payload.
2.
The removal of the payload from the airplane is necessary to decrease the airplane weight. After passengers are off the airplane you can start the removal of all baggage and cargo from the cargo compartments. In this document, we recommend the removal of the fuel from the airplane as your first step. After the fuel is removed the cargo can also be removed.
3.
You must prepare a procedure when you first examine the airplane. This procedure must show the relation between the payload removal and the defueling procedures for the CG control. Do not remove the payload until you calculate the CG of the airplane for the tow configuration.
4.
If only one or two main landing gear (but no nose landing gear) are there, this may not be a stable condition during the payload removal operation. Persons should be aware. The airplane can suddenly shift down on its aft compartment while the payload is being removed. Provide adequate supports as necessary during the payload removal operation.
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