For ELA1 and ELA2 aircraft, what are the maximum consequences of a non-conformity that qualifies as having a negligible safety effect?

At worst, it slightly reduces the operational or functional certified capabilities of the aircraft or its safety margins, causes some physical discomfort to its occupants, and slightly increases the workload of the flight crew.

For aircraft other than ELA1 and ELA2, what is the required impact of a non-conformity to be considered of negligible safety effect?

It must have no effect on the operational or functional certified capabilities of the aircraft, or on its safety margins; cause no physical discomfort to the occupants; and have no effect on the flight crew.

What is the difference in the safety effect threshold between ELA1/ELA2 aircraft and other aircraft?

For ELA1/ELA2 aircraft, a negligible safety effect may slightly reduce operational or functional capabilities or safety margins, cause some physical discomfort, and slightly increase flight crew workload. For other aircraft, it must have no effect on capabilities, safety margins, occupant comfort, or flight crew.

GM1 21.A.307(b)(3) and (b)(4) Meaning of 'negligible safety effect'

Q: What does 'negligible safety effect' mean for a part or appliance under 21.A.307(b)(3) and (b)(4)?

It means that any non-conformity of the part or appliance not identified by the installer that conducted the specific verification activities mentioned in 21.A.307(c) has, at worst, the effects described in GM1 21.A.307(b)(3) and (b)(4) for ELA1/ELA2 aircraft or for any other aircraft.

Q: Which verification activities are referenced in the definition of 'negligible safety effect'?

The specific verification activities mentioned in 21.A.307(c).

Q: Does the definition of 'negligible safety effect' apply to non-conformities that are identified by the installer?

No, it applies only to non-conformities not identified by the installer that conducted the specific verification activities mentioned in 21.A.307(c).

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GM1 21.A.307(b)(3) and (b)(4) Meaning of ‘negligible safety effect’

ED Decision 2021/007/R

For the purpose of 21.A.307(b)(3) and (b)(4), when ‘a part or appliance for which the consequences of non-conformity to its design has a negligible safety effect when installed on the product’ is mentioned, it means that any non-conformity of the part or appliance not identified by the installer that conducted the specific verification activities mentioned in 21.A.307(c):

(a) for ELA1 and ELA2 aircraft, at worst:

(1) slightly reduces the operational or functional certified capabilities of the aircraft or its safety margins;

(2) causes some physical discomfort to its occupants; and

(3) slightly increases the workload of the flight crew; and

(b) for any other aircraft:

(1) has no effect on the operational or functional certified capabilities of the aircraft, or on its safety margins;

(2) causes no physical discomfort to the occupants; and

(3) has no effect on the flight crew.

Details

Source-Title: GM1 21.A.307(b)(3) and (b)(4) Meaning of 'negligible safety effect' View latest amendments

Erulesid: ERULES-1963177438-18975 Compare versions

Domain: Initial airworthiness

Applicabilitydate: 18 May, 2022

Entryintoforcedate: 29 May, 2021

Regulatorysource: ED Decision 2021/007/R Navigate

Regulatorysubject: Part-21

Typeofcontent: GM to IR (Guidance material to implementing rule)

Parentir: 21.A.307 The eligibility of parts and appliances for installation

Origin: EASA

Category: EAR