Takeoff requirements

Mon Sep 22, 2014 6:37 pm

Going through my Maule POH tonight I noticed something that hadn't caught my eye before.

3.3.B Recommended flap settings

Note: The airplane meets CAR 3 takeoff climb requirements at ....

Anyone know what "CAR 3 takeoff climb requirements" are? I couldn't find an explanation.

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Mon Sep 22, 2014 7:30 pm

Re: Takeoff requirements

Try this, a copy paste link. Civil air regulations
http://books.google.com/books?id=IdWmOw ... ts&f=false

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Mon Sep 22, 2014 7:45 pm

Re: Takeoff requirements

According to the FAA's table, CAR Part 3.85 (which now maps to FAR Part 23.75):

Sec. 23.75 Climb requirements for airplanes of 6,000 pounds or less maximum weight.

(a) The airplane must have a steady rate of climb at sea level of 300 feet per minute, or 10 times (expressed in feet per minute), whichever is greater, with --
(1) Takeoff power applied;
(2) The landing gear extended;
(3) The wing flaps in the takeoff position; and
(4) The cowl flaps in the position used in the cooling tests required by Secs. 23.961 through 23.999.
(b) A multi-engine airplane with a stalling speed of more than 70 miles per hour must be able to maintain a steady rate of climb of at least 0.02 (in feet per minute), at an altitude of 5,000 feet with --
(1) The critical engine inoperative;
(2) The remaining engine(s) operating at not more than maximum continuous power;
(3) The inoperative propeller in the minimum drag position;
(4) The landing gear retracted;
(5) The wing flaps in the most favorable position; and
(6) The cowl flaps in the position used in the cooling tests required by Secs. 23.961 through 23.999.
(c) The steady rate of climb at 5,000 feet for a multi-engine airplane with a stalling speed of 700 miles per hour or less must be determined with --
(1) The critical engine inoperative;
(2) The remaining engine(s) operating at not more than maximum continuous power;
(3) The inoperative propeller in the minimum drag position;
(4) The landing gear retracted;
(5) The wing flaps in the most favorable position; and
(6) The cowl flaps in the position used in the cooling tests required by Secs. 23.991 through 23.999.
(d) For a balked landing, the airplane must be able to maintain a steady rate of climb at sea level of 200 feet per minute, or five times (in feet per minute), whichever is greater, with --
(1) Takeoff power on each engine;
(2) The landing gear extended; and
(3) The wing flaps in the landing position, except that, if rapid retraction is possible with safety, without loss of altitude, and without requiring sudden changes of angle of attack or an exceptional degree of piloting skill, they may be retracted.
[Revision note: Based on Sec. 3.85a]

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Mon Sep 22, 2014 7:48 pm

Re: Takeoff requirements

Perfect, thanks guys.

rw2 offline

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Mon Sep 22, 2014 7:52 pm

Re: Takeoff requirements

Civil Air Regulation 3 was the basis for light aircraft certification between 1949 and February 1, 1965. CAR 3 was superseded by FAR 23. Aircraft certified between 1949 and January 31 1965 were required to meet the standards specified in CAR 3. Many aircraft originally certificated under CAR 3 remained in production after FAR 23 and did not need to meet the new criteria of FAR 23 (like your Maule).

Here's what CAR 3 had to say about takeoff performance for aircraft. You can see how FAR 23.75 has a significantly more requirements.

TAKE-OFF
§ 3.84 Take-off. (a) The distance required to take off and climb over a 50-foot obstacle shall be determined under the following conditions:
(1) Most unfavorable combination of weight and center of gravity location,
(2) Engines operating within the approved limitations,
(3) Cowl flaps in the position normally used for take-off.
(b) Upon obtaining a height of 50 feet above the level take-off surface, the airplane shall have attained a speed of not less than 1.3 Vs1 unless a lower speed of not less than Vx plus 5 can be shown to be safe under all conditions, including turbulence and complete engine failure.
(c) The distance so obtained, the type of surface from which made, and the pertinent information with respect to the cowl flap position, the use of flight-path control devices and landing gear retraction system shall be entered in the Airplane Flight Manual. The take-off shall be made in such a manner that its reproduction shall not require an exceptional degree of skill on the part of the pilot or exceptionally favorable conditions.