What is the maximum allowable probability of capsizing within 5 minutes in the selected sea conditions when the critical float compartment has failed, assuming 95% confidence?

The probability of capsizing must be substantiated to be less than or equal to 30.0 % with the critical float compartment failed, with 95 % confidence.

How must automatic deployment of an emergency flotation system be triggered after water entry?

The emergency flotation system must have a means of automatic deployment following water entry, and this automatic deployment must not rely on any pilot action during flight.

What must be demonstrated regarding the rotorcraft's behaviour during ditching water entry?

The probable behaviour of the rotorcraft during ditching water entry must be shown to exhibit no unsafe characteristics.

When are external doors and windows not required to withstand the probable maximum local pressures during ditching?

External doors and windows are not required to withstand the probable maximum local pressures if the effects of their collapse are accounted for in the investigation of the probable behaviour of the rotorcraft during ditching (as prescribed in sub-paragraphs (d) and (e)).

CS 29.801 Ditching

Q: For a rotorcraft with ditching provisions, which specific CS 29.8xx series paragraphs must be met in addition to CS 29.801 itself?

The rotorcraft must meet CS 29.563, CS 29.783(h), CS 29.803(c), CS 29.805(c), CS 29.807(d), CS 29.809(j), CS 29.811(h), CS 29.813(d), CS 29.1411, CS 29.1415, CS 29.1470, CS 29.1555(d), and CS 29.1561.

Q: What specific design requirement applies to an emergency flotation system stowed deflated during normal flight regarding water impact?

The emergency flotation system must be designed such that the effects of a water impact (i.e. crash) on the emergency flotation system are minimised.

Q: What is the purpose of taking practicable design measures compatible with the general characteristics of the rotorcraft in the context of ditching?

Each practicable design measure must be taken to minimise the probability that when ditching, the behaviour of the rotorcraft would cause immediate injury to the occupants or would make it impossible for them to escape.

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CS 29.801 Ditching

ED Decision 2023/001/R

(a) If certification with ditching provisions is requested by the applicant, the rotorcraft must meet the requirements of this CS and CS 29.563, CS 29.783(h), CS 29.803(c), CS 29.805(c), CS 29.807(d), CS 29.809(j), CS 29.811(h), CS 29.813(d), CS 29.1411, CS 29.1415, CS 29.1470, CS 29.1555(d) and CS 29.1561.

(b) Each practicable design measure, compatible with the general characteristics of the rotorcraft, must be taken to minimise the probability that when ditching, the behaviour of the rotorcraft would cause immediate injury to the occupants or would make it impossible for them to escape.

(1) be designed such that the effects of a water impact (i.e. crash) on the emergency flotation system are minimised.

(2) have a means of automatic deployment following water entry. Automatic deployment must not rely on any pilot action during flight.

(d) The probable behaviour of the rotorcraft during ditching water entry must be must be shown to exhibit no unsafe characteristics.

(e) The rotorcraft must be shown to resist capsize in the sea conditions selected by the applicant. The probability of capsizing in a 5-minute exposure to the sea conditions must be substantiated to be less than or equal to 3.0 % with a fully serviceable emergency flotation system and 30.0 % with the critical float compartment failed, with 95 % confidence.

Allowances must be made for probable structural damage and leakage.

(f) Unless the effects of the collapse of external doors and windows are accounted for in the investigation of the probable behaviour of the rotorcraft during ditching (as prescribed in sub-paragraphs (d) and (e)), the external doors and windows must be designed to withstand the probable maximum local pressures.

(g) It must be shown that the rotorcraft will not sink following the functional loss of any single complete flotation unit.

[Amdt No: 29/5]

[Amdt No: 29/11]

Details

Source-Title: CS 29.801 Ditching View latest amendments

Erulesid: ERULES-1963177438-11428 Compare versions

Domain: Initial airworthiness

Amendedby: Amendment 11

Applicabilitydate: 8 February, 2023

Entryintoforcedate: 8 February, 2023

Regulatorysource: ED Decision 2023/001/R Navigate

Regulatorysubject: CS-29

Typeofcontent: CS (Certification specification)

Origin: EASA

Category: EAR

CS 29.801 Ditching

Details

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