Unbalanced in Charlotte

Air Safety Week, March 8, 2004

Evolution of a Design Three airplanes, one type certification number
Item: Max takeoff weight
-200 model: 12,500 lbs.
-1900C model: 16,600 lbs.
Difference from -200 (% change):   4,100 lbs. ( 32%)
-1900D model: 17,120 lbs.
Difference from -1900C model (% change):  520 lbs. ( 3%)
Difference -1900D from -200 model (% change):   4,620 lbs.( 37 %)

Item: Length
-200 model: 43.8 ft.
-1900C model: 57.9 ft.
Difference from -200 (% change):   14.1 ft. (  32 %)
-1900D model: 57.9 ft.
Difference from -1900C model (% change): No change
Difference -1900D from -200 model (% change):   14.1 ft. (  32 %)

Item: Wingspan
-200 model: 54.5 ft.
-1900C model: 54.5 ft.
Difference from -200 (% change): No change
-1900D model: 57.9 ft.
Difference from -1900C model (% change):   3.4 ft. (  6 %)
Difference -1900D from -200 model (% change):   3.4 ft. (  6 %)

Item: Center of gravity (CG) range
-200 model: 11.4 inches
-1900C model: 17.7 inches
Difference from -200 (% change):   6.3 inches ( 55 %)
-1900D model: 17.0 inches
Difference from -1900C model (% change): -0.7 inches (- 4%)
Difference -1900D from -200 model (% change):   5.6 inches ( 49 %)

Item: Crew and passengers
-200 model: 15
-1900C model: 21
Difference from -200 (% change):   6 (  40 %)
-1900D model: 21
Difference from -1900C model (% change): No change
Difference -1900D from -200 model (% change):   6 (  40 %)

Item: Max. baggage
-200 model: 1,315 lbs.
-1900C model: 1,910 lbs.
Difference from -200 (% change): 595 lbs. (  45 %)
-1900D model: 1,880 lbs.
Difference from -1900C model (% change): - 30 lbs. (- 1.5 %)
Difference -1900D from -200 model (% change):   565 lbs. (  42 %)

Item: Wing loading
-200 model: 41.3 lb./ft.2
-1900C model: 54.8 lb./ft.2
Difference from -200 (% change):   13.5 lb./ft.2  (  32 %)
-1900D model: 54.7 lb./ft.2
Difference from -1900C model (% change): - 0.1 (< 1 %)
Difference -1900D from -200 model (% change):   13.4 lb./ft.2  (  32 %)

Item: Power loading
-200 model: 7.35 lb./SHP
-1900C model: 7.54 lb./SHP
Difference from -200 (% change):   0.19  (  2.5 %)
-1900D model: 6.63 lb./SHP
Difference from -1900C model (% change): - 0.91 (- 12 %)
Difference -1900D from -200 model (% change): - 0.72 lb./SHP  (- 9 %)

Source: FAA, Type Certificate Data Sheet No. A24CE

Examples of Significant Changes to Any Airplane

Description of change: Derivative model, e.g., increased payload or complete update.

Is there a change to the general configuration?: Yes Is there a change to the principles of construction?: Yes Have the assumptions used for certification been invalidated?: Yes Comments: Multiple changes packaged into a new model.

Description of change: Fuselage length change - increase or shorten. Is there a change to the general configuration?: Yes Is there a change to the principles of construction?: No Have the assumptions used for certification been invalidated?: No Comments: Certification assumptions invalidated only when new airplane flight manual needed to address performance characteristics.

Description of change: Weight increase of 10% or more. Is there a change to the general configuration?: No Is there a change to the principles of construction?: No Have the assumptions used for certification been invalidated?: Yes Comments: Requires extensive resubstantiation of aircraft structure, associated systems and flying qualities.