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REGULATIONS

FLIGHT

SECTION 3603 - DC - 3 AIRPORT ANALYSES

The CAA has requested that Colonial Airlines demonstrate the manner in which it is complying with Sections VIII and X of the preface pages of the DC-3 Operating Specifications. These sections concern the allowable gross weights for take-off and landing at which the airplane may be legally operated and create restrictions based on certain aspects of the performance of the airplane in relation to the elevation of the field, the length of the runway, the obstacles beyond the runway and the wind conditions.

For take-off, the airplane must be at a gross weight such that:-

1- If an engine failure occurs at an indicated airspeed of 88 mph or less, the plane may be braked to a stop within the confines of the runway using normal braking force, and/or

2- If one engine failure occurs between 88 mph and 110 mph, the take-off can be successfully continue and all obstacles in the flight path cleared. A bank not to exceed 150 is allowed.

In addition, for purposed of increasing the allowable gross weight on a restricted runway, but not above 25346 lbs. all the headwind component less 5 mph may be used. 

In determining the specific weights for each runway into which Colonial Airlines operates, the following assumptions in the form of safety margins were included in the performance calculations:-

(a) In this flight path, the propeller is not feathered until the airplane has attained a height of 50 ft. or the gear has completely retracted, whichever is later. 

(b) The gear is assumed to be exerting full drag during the entire time it is retracting (11.5 sec.).

(c) The propeller is furnishing no thrust and exerting full windmilling drag during the entire feathering time (6 sec.). This also assumes that the power loss is complete and instantaneous. 

(d) The engine fails at exactly 88 mph or 110 mph.

For landing, the airplane must be at a gross weight such as that,

1- There is sufficient length to permit normal straight-in approach and landing and normal deceleration to a full stop within 60% of the effective runway length as defined by CAR 61. In this connection all the headwind component less 5 mph may be used to increase the landing weight to 24546 1bs.

11/17/47 (11/4/47) 
FLIGHT