In the up-load condition, what is the ratio of the aft component to the vertical component?

The aft component is 0.25 times the vertical component (CS 29.521(a)(2)).

In the float up-load condition, what aft component must be applied simultaneously with the vertical load?

The vertical load prescribed in CS 29.521(a)(1) must be applied simultaneously with an aft component of 0.25 times the vertical component (CS 29.521(a)(2)).

For the side load condition on floats, how is the vertical load distributed among the floats?

A vertical load of 0.75 times the total vertical load specified in CS 29.521(a)(1) is divided equally among the floats (CS 29.521(b)(1)).

What is the magnitude of the total side load in the float side load condition relative to the vertical load?

The total side load is 0.25 times the total vertical load specified in CS 29.521(b)(1) (CS 29.521(b)(2)).

What is the total vertical load used as the basis for the side load condition?

The total vertical load specified in CS 29.521(a)(1) is used as the basis; the side load condition uses 0.75 times that total vertical load for the vertical distribution and 0.25 times that total vertical load for the side load (CS 29.521(b)(1) and (b)(2)).

How is the load share for each float determined in the side load condition?

The load share for each float is determined by dividing equally among the floats a vertical load of 0.75 times the total vertical load specified in CS 29.521(a)(1) (CS 29.521(b)(1)).

In the side load condition, is the side load applied to all floats simultaneously or to each float individually?

The side load is applied to each float individually: for each float, the load share determined under CS 29.521(b)(1) combined with a total side load of 0.25 times the total vertical load specified in sub-paragraph (b)(1) is applied to that float only (CS 29.521(b)(2)).

What is the total side load magnitude in the side load condition?

The total side load is 0.25 times the total vertical load specified in CS 29.521(b)(1) (CS 29.521(b)(2)).

What is the vertical load magnitude that is divided equally among the floats in the side load condition?

A vertical load of 0.75 times the total vertical load specified in CS 29.521(a)(1) is divided equally among the floats (CS 29.521(b)(1)).

What is the ratio of the side load to the vertical load in the side load condition?

The total side load is 0.25 times the total vertical load specified in CS 29.521(b)(1) (CS 29.521(b)(2)).

What is the total vertical load specified in CS 29.521(a)(1) used for in the side load condition?

It is used as the basis for calculating the vertical load (0.75 times) and the side load (0.25 times) in the side load condition (CS 29.521(b)(1) and (b)(2)).

What is the load share for each float in the side load condition?

The load share for each float is the equal division of a vertical load of 0.75 times the total vertical load specified in CS 29.521(a)(1) (CS 29.521(b)(1)).

What is the design requirement for a rotorcraft with floats under CS 29.521?

The rotorcraft, with floats, must be designed to withstand the loading conditions specified in CS 29.521(a) and (b) (CS 29.521).

What is the ratio of the vertical load in the side load condition to the total vertical load in the up-load condition?

The vertical load in the side load condition is 0.75 times the total vertical load specified in CS 29.521(a)(1) (CS 29.521(b)(1)).

CS 29.521 Float landing conditions

Q: What is the required design condition for a rotorcraft with floats when the resultant water reaction passes vertically through the centre of gravity in the static level attitude?

A load must be applied so that, with the rotorcraft in the static level attitude, the resultant water reaction passes vertically through the centre of gravity (CS 29.521(a)(1)).

Q: When applying the side load condition to a single float, what combination of loads must be applied to that float only?

For each float, the load share determined under CS 29.521(b)(1) must be combined with a total side load of 0.25 times the total vertical load specified in sub-paragraph (b)(1), and this combined load is applied to that float only (CS 29.521(b)(2)).

Q: Under CS 29.521, how is the limit load factor for float loading conditions determined?

The limit load factor is determined under CS 29.473(b) or assumed to be equal to that determined for wheel landing gear (CS 29.521).

Q: For a rotorcraft with floats, what is the required design condition when the rotorcraft is in the static level attitude and the resultant water reaction passes vertically through the centre of gravity?

A load must be applied so that, with the rotorcraft in the static level attitude, the resultant water reaction passes vertically through the centre of gravity (CS 29.521(a)(1)).

Navigate / EASA

Ask question Discover more Add to collection

CS 29.521 Float landing conditions

ED Decision 2003/16/RM

If certification for float operation (including float amphibian operation) is requested, the rotorcraft, with floats, must be designed to withstand the following loading conditions (where the limit load factor is determined under CS 29.473(b) or assumed to be equal to that determined for wheel landing gear):

(a) Up-load conditions in which:

(1) A load is applied so that, with the rotorcraft in the static level attitude, the resultant water reaction passes vertically through the centre of gravity; and

(2) The vertical load prescribed in sub-paragraph (a)(1) is applied simultaneously with an aft component of 0.25 times the vertical component.

(b) A side load condition in which:

(1) A vertical load of 0.75 times the total vertical load specified in sub-paragraph (a)(1) is divided equally among the floats; and

(2) For each float, the load share determined under sub-paragraph (b)(1), combined with a total side load of 0.25 times the total vertical load specified in sub-paragraph (b)(1), is applied to that float only.

Details

Source-Title: CS 29.521 Float landing conditions View latest amendments

Erulesid: ERULES-1963177438-5464 Compare versions

Domain: Initial airworthiness

Amendedby: Initial issue

Applicabilitydate: 14 November, 2003

Entryintoforcedate: 14 November, 2003

Regulatorysource: ED Decision 2003/16/RM Navigate

Regulatorysubject: CS-29

Typeofcontent: CS (Certification specification)

Origin: EASA

Category: EAR