Which parts of the rotorcraft structure must use the special factors given in CS 29.621 to 29.625?

The special factors apply to each part of the structure whose strength is uncertain, likely to deteriorate in service before normal replacement, or subject to appreciable variability due to uncertainties in manufacturing processes or inspection methods.

What are the three conditions that trigger the application of special factors to a structural part?

The three conditions are: (1) strength is uncertain, (2) strength is likely to deteriorate in service before normal replacement, or (3) strength is subject to appreciable variability due to uncertainties in manufacturing processes or inspection methods.

How is the factor of safety adjusted for parts that fall under CS 29.619?

For each part to which CS 29.621 to 29.625 apply, the factor of safety prescribed in CS 29.303 must be multiplied by a special factor equal to either the applicable special factors from CS 29.621 to 29.625, or any other factor large enough to ensure that the probability of the part being under strength because of the specified uncertainties is extremely remote.

Which regulation specifies the base factor of safety that must be multiplied by the special factors?

CS 29.303 specifies the factor of safety that must be multiplied by the special factor.

Does CS 29.619 require special factors for all structural parts of a rotorcraft?

No, it applies only to parts whose strength is uncertain, likely to deteriorate in service before normal replacement, or subject to appreciable variability due to manufacturing or inspection uncertainties.

What types of variability are considered in CS 29.619(a)(3)?

Appreciable variability due to uncertainties in manufacturing processes or uncertainties in inspection methods.

CS 29.619 Special factors

Q: What does 'extremely remote' refer to in the context of CS 29.619(b)(2)?

It refers to the probability of the part being under strength because of the uncertainties specified in sub-paragraph (a).

Q: What alternative to the prescribed special factors is allowed under CS 29.619(b)?

The alternative is any other factor great enough to ensure that the probability of the part being under strength because of the uncertainties specified in sub-paragraph (a) is extremely remote.

Q: What is the purpose of using a special factor larger than the prescribed ones in CS 29.621 to 29.625?

The purpose is to ensure that the probability of the part being under strength because of the uncertainties specified in sub-paragraph (a) is extremely remote.

Navigate / EASA

Ask question Discover more Add to collection

CS 29.619 Special factors

ED Decision 2003/16/RM

(a) The special factors prescribed in CS 29.621 to 29.625 apply to each part of the structure whose strength is:

(1) Uncertain;

(2) Likely to deteriorate in service before normal replacement; or

(3) Subject to appreciable variability due to:

(i) Uncertainties in manufacturing processes; or

(ii) Uncertainties in inspection methods.

(b) For each part of the rotorcraft to which CS 29.621 to 29.625 apply, the factor of safety prescribed in CS 29.303 must be multiplied by a special factor equal to:

(1) The applicable special factors prescribed in CS 29.621 to 29.625; or

(2) Any other factor great enough to ensure that the probability of the part being under strength because of the uncertainties specified in sub-paragraph (a) is extremely remote.

Details

Source-Title: CS 29.619 Special factors View latest amendments

Erulesid: ERULES-1963177438-5533 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