Single-engine aircraft may be operated over routes deemed by the Administrator to have suitable landing terrain.
40.231 If single-engine Operation over water. Applicant shall show water aircraft of model and number necessary for safe operation, or applicant may show a similar number of land aircraft if the route to be flown over is such that the aircraft can, at all times, reach land deemed suitable by the Administrator for a safe landing in the event of complete power failure.
40.232 If multi-engine operation over land. Applicant shall show aircraft of a model and number necessary for safe operation. Applicant shall also show:
(a) That such aircraft (other than those specifically listed as in scheduled air carrier service by the applicant prior to January 1, 1935) to be used on the proposed route or part thereof are capable, with any one engine inoperative, of maintaining level flight with authorized load for the route or part thereof at an altitude of at least 1,000 feet above the highest obstruction to flight on the valley level of the route or part thereof on which the aircraft will be operated; or
(b) Operating procedures which, in the opinion of the Administrator, will assure that such aircraft will be capable of effecting a safe landing at an airport or other suitable area in the event of the failiure of any one engine at any point on the route on which such aircraft will be operated.
40.2320 Engine rotation. on and after July 1, 1941, applicant shall show that any aircraft to be used in air transportation which have engines with maximum power ratings of 480 horsepower or more are so equipped that engine rotation may be promptly stopped during flight; and, on and after January 1, 1943, the same showing shall be made with respect to all other aircraft to be used in air transportation.
40.233 If multi-engine operation over water. Applicant shall show aircraft of model and number necessary for safe operation. Applicant shall also show that such aircraft, which are to be used on the proposed route or part thereof are capable, with any one engine inoperative, of maintaining level flight with authorized load at an altitude of at least 1,000 feet above the water. No multi—engine land aircraft shall be operated, over water, beyond gliding distance from shore without the aid of power, unless such aircraft is equipped with a retractable landing gear, with one or more suitable emergency exists located in the upper half of the fuselage, with life preservers or other adequate flotation devices readily available for each person on board, with a Very pistol and cartridges or equivalent signal equipment deemed suitable by the Administrator, and with radio equipment as required by §§ 40.253, 40.2530, and 40.2531. The requirements of flotation devices and signal equipment are not applicable where the operation over water is merely that of landings and take-offs, provided there is available marine rescue equipment deemed suitable by the Administrator.
40.2330 Engine rotation. On and after July 1, 1941, applicant shall show that any aircraft to be used in air transportation which have engines with maximum power ratings of 480 horsepower or more are so equipped that engine rotation may be promptly stopped during flight; and, on and after January 1, 1943, the same showing shall be made with respect to all other aircraft to be used in air transportation.
40.234 Number of aircraft. Applicant shall show aircraft, certificated as provided in § 04.53, of a number sufficient to permit the maintenance of all schedules proposed, as provided for in § 40.16.
40.235 Radio equipment. Applicant shall show that each aircraft is equipped with a type certificated two—way radio telephone having sufficient power to permit communication, under normal operating conditions, with at least one ground station used or to be used by the applicant on the regular or alternate route, and capable of communication with other aircraft of the applicant in flight. In addition, each aircraft shall be provided with at least one type certificated radio receiving system capable of receiving radio range signals and Weather broadcasts. Such receiving system shall include a type certificated audio filter system with suitable switching arrangements to be used in connection with the reception of simultaneous radio range and voice broadcasts: Provided, That such audio filter system will not be required if the airway or route traversed is not equipped with simultaneous type radio range stations.
40.230 Hangar facilities. Applicant shall show hangar or other facilities adequate for the proper maintenance of the aircraft, engines, equipment, and parts.
40.237 Shop facilities. Applicant shall show shop facilities (including facilities for servicing, repair, and overhaul) adequate for the proper maintenance of all aircraft, engines, and equipment used.
