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1.9.3.4  Normal precautions, consistent with good practices in the mass determination procedures, should be taken, such as:
a)  aircraft and equipment should be checked for completeness in accordance with 1.9.3.3 above;
b)  fluids should be properly accounted for;
c)  mass determination should be carried out in an enclosed building, to avoid the effect of wind; and
d)  the scales used should be properly calibrated and used in accordance with the manufacturer's instructions.
1.9.3.5 An aircraft mass summary should be completed and a certified by the person supervising the measurement. Data recorded should be sufficient to enable the empty mass and empty mass centre of gravity position to be accurately determined.
1.9.3.6 The empty mass and empty centre of gravity position should be determined by the owner or operator of the aircraft in accordance with the recorded results of the measurements.
1.9.4  Loading data
1.9.4.1  The loading schedule should be kept with the aircraft, forming a part of the aircraft flight manual. It should include instructions on the proper load distribution such as filling of fuel tanks and oil tanks, passenger movement, distribution of cargo, etc. A check should be made to determine if the schedule will allow computation of separate loading conditions when the aircraft is to be loaded in other than the specified conditions shown in the loading schedule.
1.9.4.2  Information on which to base records of mass and balance changes to the aircraft may be obtained from the pertinent aircraft specifications, aircraft flight manual and the aircraft mass and balance report. Operators should maintain records of all known mass and centre of gravity changes which occur after the aircraft mass has been determined.
1.9.4.3 A mass and centre of gravity schedule should be provided for each aircraft. Each schedule should be identified by the aircraft designation, nationality and registration marks. The date of issue of the schedule should be given and the schedule should be signed by an approved representative of the organization or a person suitably qualified or acceptable to the CAA. A statement should be included indicating that the schedule supersedes all earlier issues.
1.9.5 Aircraft mass control organization
1.9.5.1  The CAA should consider applications from an operator to determine the mass of certain types of aircraft on a sampling basis, provided the operator has an approved mass control organization.
Note.— Three or more aircraft of the same type under the control of one operator may, with the approval of the CAA, be treated as a fleet for the purposes of preparation and approval of loading data.
1.9.5.2  Such an organization should consist of a minimum of two engineers, or one engineer and one mass control officer, or two mass control officers. The staff of an approved mass control organization should have adequate facilities to enable the maintenance of records of mass changes of each aircraft of the operator's fleet. 
1.9.5.3 Application for approval. Application for approval should be made to the CAA and should include the following:
a)  the qualifications, and experience required by the operator for members of the aircraft mass control organization;
b)  details of the method of liaison with other sections of the organization to ensure that all records of mass changes are transmitted to the aircraft mass control organization; and
c)  details of the procedure within the organization for ensuring adequate control of the loading of all aircraft.
1.9.5.4  The mass and balance control system should include methods by which the operator will complete a current and continuous record of the mass and centre of gravity of each aircraft. Such records should reflect all alterations and changes affecting either the mass or balance of the aircraft and should include a complete and current equipment list. When fleet mass is used, pertinent computations should be available in individual aircraft files.
　
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