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9/27/01 AC 43.13-1B CHG 1 10-14. GENERAL. Weighing procedures may vary with the aircraft and the type of weighing equipment employed. The weighing procedures contained in the manufacturer’s maintenance manual should be followed for each particular aircraft. 10-15. PROCEDURES. Accepted proce dures when weighing an aircraft are: a. Remove excessive dirt, grease, mois ture, etc., from the aircraft before weighing. b. Weigh the aircraft inside a closed building to prevent error in scale reading due to wind. c. Determine the empty weight c. g. by placing the aircraft in a level flight attitude. d. Have all items of equipment that are included in the certificated empty weight re port installed in the aircraft when weighing. These items of equipment are a part of the cur rent weight and balance report. e. The scales should have a current cali bration before weighing begins. Zero and use the scales in accordance with the scale manu facturer’s instructions. Platform scales and suitable support for the aircraft, if necessary, are usually placed under the wheels of a land- plane, the keel of a seaplane float, or the skis of a skiplane. Other structural locations capa ble of supporting the aircraft, such as jack pads, may be used. Clearly indicate these points and the alternate equipment used in the weight and balance report. f. Drain the fuel system until the quantity indicator reads zero or until the tanks are empty with the aircraft in level flight attitude, unless otherwise noted in the TCDS or Aircraft Specifications. The amount of fuel remaining in the tank, lines, and engine is termed residual fuel and is to be included in the empty weight. In spe cial cases, the aircraft may be weighed with full fuel in tanks provided a definite means of determining the exact weight of the fuel is available. g. The oil system should be filled to the quantity noted in the TCDS or Aircraft Speci fications. NOTE: On Civil Aeronautics Regula- tions (CAR-3) Certified Aircraft, the weight of the oil was subtracted mathematically to get the empty weight. In 14 CFR, part 23 aircraft, the weight of the oil is included in the empty weight. When weighed with full oil, actual empty weight equals the actual recorded weight less the weight of the oil in the oil tank( oil weight = oil capacity in gallons x 7.5 pounds). Indi cate on all weight and balance reports whether weights include full oil or oil drained. (See fig ure 10-9.) h. Do not set brakes while taking scale reading. i. Note any tare reading when the aircraft is removed from the scales. 10-15a. REPAIRS AND ALTERATIONS are the major sources of weight changes, and it is the responsibility of the aircraft mechanic making any repairs or alteration to know the weight and location of these changes, and to compute the new CG and record the new empty (EW) weight and EWCG data in the aircraft flight manual. 10-15b. ANNUAL OR 100-HOUR IN- SPECTION. After conducting an annual or 100-hour inspection, the aircraft mechanic SECTION 2 WEIGHING PROCEDURES Par 10-14 Page 10-11PDF Image | AFS-640
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