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General Writtens > Weight and Balance > Flashcards

Weight and Balance Flashcards

1
Q

When computing weight and balance, an airplane is considered to be in balance when…

A

The average moment arm of the loaded airplane falls within its CG range.

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2
Q

What tasks are completed prior to weighing an aircraft to determine its empty weight?

A

Remove all items except those on the aircraft equipment list; drain fuel and fill hydraulic reservoir.

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3
Q

What is meant by the term “residual fuel”?

A

The fuel remaining in the tanks, lines, and engine after draining.

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4
Q

The useful load of an aircraft consists of the…

A

Crew, usable fuel, passengers, and cargo.

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5
Q

Which of the following can provide the empty weight of an aircraft if the aircraft weight and balance records become lost, destroyed, or otherwise inaccurate?

A

Reweighing the aircraft.

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6
Q

When calculating the new weight and balance for an aircraft, what is used determine the operating CG range?

A

The Type Certificate Data Sheets.

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7
Q

When calculating the new weight and balance for an aircraft, what is used to determine the operating CG range?

A

The Type Certificate Data Sheets.

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8
Q

In the theory of weight and balance, what is the name of the distance from the fulcrum to an object?

A

Lever arm.

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9
Q

In the process of weighing an airplane toward obtaining the CG, the arms from the weighing points always extend…

A

Parallel to the centerline of the airplane.

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10
Q

Which of the following have an effect on aircraft CG results when conducting a weight and balance check?

A

Leaving the downlocks installed.

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11
Q

Which of the following may cause erroneous (incorrect) scale readings?

A

Parking brakes set.

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12
Q

(1) Private aircraft are required by regulations to be weighted periodically.

(2) Private aircraft are required to be weighed after making any alteration.

Regarding the above statements,

A

Neither 1 nor 2 is true.

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13
Q

What FAA-approved document gives the leveling means to be used when weighing an aircraft?

A

Type Certificate Data Sheet.

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14
Q

Which device(s) is/are used to obtain the greatest accuracy of aircraft leveling?

A

Spirit level.

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15
Q

To obtain useful weight data for purposes of determining the CG, it is necessary that an aircraft be weighed…

A

In a level flight attitude.

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16
Q

What type of measurement is used to designate the arm in weight and balance computation?

A

Distance

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17
Q

What determines whether the value of a moment is preceded by a plus (+) or a minus (-) sign in aircraft weight and balance

A

The location of the weight relative to the datum and if it is being removed or added.

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18
Q

The maximum weight of an aircraft is the…

A

Empty weight plus useful load.

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19
Q

Which statement is true regarding helicopter weight and balance?

A

Weight and balance procedures for airplanes also apply to helicopters.

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20
Q

What should be clearly indicated on the aircraft weighing form?

A

Weighing points.

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21
Q

If the reference datum line is placed at the nose of an airplane rather than at the firewall or some other location aft of the nose…

A

All measurement arms will be in positive numbers.

22
Q

Maximum zero fuel weight is the…

A

Maximum permissible weight of a loaded aircraft (passengers, crew, and cargo) without fuel.

23
Q

If it is necessary to weigh an aircraft with full fuel tanks, all full weight must be subtracted from the scale readings…

A

Except unuseable fuel.

24
Q

The empty weight of an airplane is determined by…

A

Subtracting the tare weight from the scale reading and adding the weight of each weighing point.

25
Q

When dealing with weight and balance of an aircraft, maximum weight is interpreted to mean the maximum…

A

Authorized weight of the aircraft and its contents.

26
Q

Most modern aircraft are designed so that if all seats are occupied, full baggage weight is carried, and all fuel tanks are full, what will be the weight condition of the aircraft?

A

It will be in excess of maximum takeoff weight.

27
Q

The major source of weight change for most aircraft as they age is caused by…

A

Repairs and alterations.

28
Q

The useful load of an aircraft is the difference between…

A

The maximum takeoff weight and basic empty weight.

29
Q

When determining the empty weight of an aircraft, certificated under current airworthiness standards (14 CFR Part 23), the oil contained in the supply tank is considered…

A

A part of the empty weight.

30
Q

The maximum weight as used in weight and balance control of a given aircraft can normally be found…

A

In the Aircraft Specification or Type Certificate Data Sheet.

31
Q

An aircraft with an empty weight of 2,100 pounds and an empty weight CG +32.5 was altered as follows:

  1. two 18-pound passenger seats located at +73 were removed;
  2. structural modifications were made at +77 increasing weight by 17 pounds;
  3. a seat and safety belt weighing 25 pounds were installed at +74.5; and
  4. Radio equipment weighing 35 pounds was installed at +95.

What is the new empty weight CG?

A

+33.68

32
Q

The CG range in single-rotor helicopters is…

A

More restricted than for airplanes.

33
Q

The amount of fuel used for computing empty weight and corresponding CG is…

A

Unusable fuel.

34
Q

An aircraft as loaded weighs 4,954 pounds at a CG of +30.5 inches. The CG range is +32.0 inches to +42.1 inches. Find the minimum weight of the ballast necessary to bring the CG within the CG range. The ballast arm is +162 inches.

A

57.16 pounds.

35
Q

As weighed, the total empty weight of an aircraft is 5,862 pounds with a moment of 855,957. However, when the aircraft was weighed, 20 pounds of potable water were on board at +84 and 23 pounds of hydraulic fluid are in a tank located at +101. What is the empty weight CG of the aircraft?

A

151.365.

36
Q

An aircraft with an empty weight of 1,800 pounds and an empty weight CG of +31.5 was altered as follows:

  1. two 15-pound passenger seats located at +72 were removed;
  2. structural modifications were made at +76 increasing weight by 14 pounds;
  3. a seat and safety belt weighing 20 pounds were installed at +73.5; and
  4. Radio equipment weighing 30 pounds was installed at +30.

What is the new empty weight CG?

A

31.61

37
Q

An aircraft had an empty weight of 2,886 pounds with a moment of 101,673.78 before several alterations were made. The alterations included:

  1. removing two passenger seats (15 pounds each) at +71;
  2. installing a cabinet (97 pounds) at +71;
  3. installing a seat and safety belt (20 pounds) at +71; and
  4. installing radio equipment (30 pounds) at +94

The alterations caused the new empty weight CG to move

A

1.62 inches aft of the original empty weight CG.

38
Q

Two boxes which weigh 10 pounds and 5 pounds are placed in an airplane so that their distance aft from the CG are 4 feet and 2 feet respectively. How far forward of the CG should a third box, weighing 20 pounds, be placed so that the CG will not be changed?

A

2.5 feet.

39
Q

If a 40-pound generator applies a +1400 inch-pounds to a reference axis, the generator is located…

A

+35 from the axis.

40
Q

In a balance computation of an aircraft from which an item located aft of the datum was removed, use …

A

(-)weight x (+)arm = (-)moment

41
Q

All other things being equal, if an item of useful load located aft of an aircraft’s CG is removed, the aircraft’s CG change will be…

A

Forward In proportion to the weight of the item and its location in the aircraft.

42
Q

Datum is forward of the main gear center point — 30.24 inches

actual distance between tail gear and main gear center points — 360.26 inches

New weight at right main gear — 9,980 pounds

Net weight at left main gear — 9,770 pounds

Net weight at tail gear — 1,970 pounds

These items were in the aircraft when weighed:
1. Lavatory water tank full (34 pounds at +352)
2. Hydraulic fluid (22 pounds at -8)
3. Removable ballast (146 pounds at +380)

What is the empty weight CG of the aircraft described above?

A

60.31 inches

43
Q

When making a rearward weight and balance check to determine that the CG will not exceed the rearward limit during extreme conditions, the items of useful load which should be computed at their minimum weights are those located forward of the…

A

rearward CG limit.

44
Q

When, or under what condition(s) are adverse loadings checks conducted?

A

Anytime a repair or alteration cause EWCG to fall outside the CG range.

45
Q

When accomplishing loading computations for a small aircraft, necessary information obtained from the weight and balance records would include…

A

Current empty weight and empty weight CG.

46
Q

When an empty aircraft is weighed, the combined net weight at the main gears is 3,540 pounds with an arm of 195.5 inches. At the nose gear, the net weight is 2,322 pounds with an arm of 83.5 inches. The datum line is forward of the nose of the aircraft. What is the empty weight CG of the aircraft?

A

151.1.

47
Q

The following alteration was performed on an aircraft: a model B engine weighing 175 pounds was replaced by a model D engine weighing 185 pounds at -62.00-inch station. The aircraft weight and balance records show the previous empty weight to be 998 pounds and an empty weight CG of 13.48 inches. What is the new empty weight CG.

A

12.73 inches.

48
Q

If the empty weight CG of an airplane lies within the empty weight CG limits…

A

It is not necessary to calculate CG extremes.

49
Q

When computing the maximum forward loaded CG of an aircraft, minimum weights, arms, and moments should be used for items of useful load that are located aft of the…

A

Forward CG limit.

50
Q

An aircraft’s LEMAC and TEMAC are defined in terms of distance…

A

From the datum.

51
Q

If an aircraft CG is found to be at 24 percent of MAC, that 25 percent is an expression of the…

A

Distance from the LEMAC.

General Writtens (11 decks)

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