What marking information is required on at least one major component of a fuel and oil quantity instrument under ETSO-C55a?

At least one major component must be permanently and legibly marked with all the information in SAE AS405C or AS405D, Section 3.2 (except paragraph 3.2.b), plus the basic type and accuracy classification, and the fluids for which the instrument is substantiated.

Which environmental standard applies to fuel and oil quantity instruments under ETSO-C55a?

As specified in SAE Aerospace Standard AS405C or AS405D, and per CS-ETSO, Subpart A, paragraph 2.1.

What is the applicability date for ETSO-C55a requirements?

The ETSO provides requirements for fuel and oil quantity instruments designed and manufactured on or after the date of this ETSO.

ETSO-C55a A1

Q: How is the failure condition classification determined for a fuel and oil quantity instrument under ETSO-C55a?

The failure condition classification depends on the system on which the instrument is installed and must be determined by the safety assessment conducted as part of the installation approval. Each instrument shall be developed to at least the design assurance level assumed to be assigned to that system.

Navigate / EASA

Ask question Discover more Add to collection

ETSO-C55a A1

ED Decision 2022/018/R

Fuel and Oil Quantity Instruments

1 Applicability

This ETSO provides the requirements that fuel and oil quantity instruments that are designed and manufactured on or after the date of this ETSO must meet in order to be identified with the applicable ETSO marking.

2 Procedures

2.1 General

The applicable procedures are detailed in CS-ETSO Subpart A.

2.2 Specific

None.

3 Technical Conditions

3.1 Basic

3.1.1 Minimum Performance Standard

The applicable standards are those provided in:

— SAE Aerospace Standard (AS) 405C ‘Fuel and oil quantity Instruments’, dated July 2001; or

— SAE Aerospace Standard (AS) 405D ‘Fuel and oil quantity Instruments’, dated August 2012,

both modified by Appendix 1 to this ETSO.

3.1.2 Environmental Standard

See CS-ETSO, Subpart A, paragraph 2.1.

As specified in SAE Aerospace Standard AS405C or AS405D.

3.1.3 Software

See CS-ETSO, Subpart A, paragraph 2.2.

3.1.4 Airborne Electronic Hardware

See CS-ETSO, Subpart A, paragraph 2.3.

3.2 Specific

3.2.1 Failure Condition Classification

See CS-ETSO, Subpart A, paragraph 2.4.

The failure condition classification will depend on the system on which the fuel and oil quantity instrument is installed. The classification must be determined by the safety assessment conducted as part of the installation approval. Each fuel and oil quantity instrument shall be developed to at least the design assurance level assumed to be assigned to the system on which the fuel and oil quantity instrument will be installed.

4 Marking

4.1 General

See CS-ETSO, Subpart A, paragraph 1.2.

4.2 Specific

At least one major component must be permanently and legibly marked with all the information in SAE AS405C or AS405D, Section 3.2 (except paragraph 3.2.b). Also, the component must be marked with the following information:

(1) The basic type and accuracy classification, and

(2) The fluids for which the instrument is substantiated.

5 Availability of Referenced Documents

See CS-ETSO, Subpart A, paragraph 3.

[Amdt ETSO/7]

[Amdt ETSO/17]

Details

Source-Title: ETSO-C55a A1 View latest amendments

Erulesid: ERULES-1963177438-18902 Compare versions

Domain: Initial airworthiness

Amendedby: Amendment 17

Applicabilitydate: 7 September, 2022

Entryintoforcedate: 7 September, 2022

Regulatorysource: ED Decision 2022/018/R Navigate

Regulatorysubject: CS-ETSO

Typeofcontent: CS (Certification specification)

Origin: EASA

Category: EAR

ETSO-C55a A1

Fuel and Oil Quantity Instruments

Details

Related sections: