EASA 145.A.50 Certification of Maintenance

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EASA Part-145 Audit: (Requirement)
Conducted on
Prepared by
Location: Bay/ Work area
Completed on:

Audit Planning

The audit is conducted in accordance with the Part-145 requirements applicable at the time of the audit. The regulatory requirements applicable at the time have been checked at www.EASA.europa.eu.regulations on (Date)
The latest published applicable regulation is recorded as:
The audit checklist has been confirmed as being reflective of the published regulation (As quoted above), by the auditor named in the report.

Audit pre-amble/context/Customer requirement:

Audit pre-amble/context/Customer requirement for audit:

Audit Questions: EASA Requirement 145.A.50

145.A.50 (a) A certificate of release to service shall be issued by appropriately authorised certifying staff on behalf of the organisation when it has been verified that all maintenance ordered has been properly carried out by the organisation in accordance with the procedures specified in point 145.A.70, taking into account the availability and use of the maintenance data specified in point 145.A.45 and that there are no non-compliances which are known to endanger flight safety.

Prior to examining the release to service, carry out an audit of the available maintenance data specified in 145.A.45. [The planning statement may be utilised as a point of reference]. Is the required maintenance data available and in use?
AMI Compliance: Does accomplishment of the subject task in accordance with the specified instructions demonstrate compliance with the operators AMI for the task?
AMC 145.A.50(A)’Endangers the flight safety’ means any instances where safe operation could not be assured or which could lead to an unsafe condition. It typically includes, but is not limited to, significant cracking, deformation, corrosion or failure of primary structure, any evidence of burning, electrical arcing, significant hydraulic fluid or fuel leakage and any emergency system or total system failure. An airworthiness directive overdue for compliance is also considered a hazard to flight safety.
Carry out a product sample of the aircraft release to service, record the elements audited and retain associated evidence to demonstrate compliance with requirements or otherwise.
Has a certificate of release to service been issued by appropriately authorised certifying staff on behalf of the organisation when it has been verified that all maintenance ordered has been properly carried out by the organisation in accordance with the procedures specified in point 145.A.70, taking into account the availability and use of the maintenance data specified in point 145.A.45 and that there are no non-compliances which are known to endanger flight safety?

145.A.50(b) A certificate of release to service shall be issued before flight at the completion of any maintenance.

AMC 145.A.50(b) Certification of maintenance
1. The certificate of release to service should contain the following statement:
‘Certifies that the work specified, except as otherwise specified, was carried out in accordance with Part-145 and in respect to that work the aircraft/aircraft component is considered ready for release to service’.
Reference should also be made to the EASA Part-145 approval number.
2. It is acceptable to use an alternate abbreviated certificate of release to service consisting of the following statement ‘Part-145 release to service’ instead of the full certification statement specified in paragraph 1. When the alternate abbreviated certificate of release to service is used, the introductory section of the technical log should include an example of the full certification statement from paragraph 1.
3. The certificate of release to service should relate to the task specified in the (S)TC holder’s or operator’s instructions or the aircraft maintenance programme which itself may cross-refer to maintenance data.
4. The date such maintenance was carried out should include when the maintenance took place relative to any life or overhaul limitation in terms of date/flying hours/cycles/landings etc., as appropriate.
5. When extensive maintenance has been carried out, it is acceptable for the certificate of release to service to summarise the maintenance as long as there is a unique cross-reference to the work package containing full details of maintenance carried out. Dimensional information should be retained in the work-pack record.
With respect to the 'completion of any maintenance' identify a sample and review to verify appropriate certification for the following requirements:
Required task Certification: B1/B2 [EASA PT-66/DQL.9/GQL.1.6]
Record the works order sampled: (B1/B2 certification) Is certification of the subject task compliant with requirements?
Required task certification: Verification check [
Record the works order sampled: (Verification Task) Is certification of the subject task compliant with requirements?
Required task certification: Duplicate Inspection [GEN.52/
Record the works order sampled: (Duplicate Inspection Task) Is certification of the subject task compliant with requirements?
Required task certification: 3rd Party org. support [EASA Form 1/
Record the works order/task sampled: (3rd Party org support task ) Is certification of the subject task compliant with requirements?
Has a certificate of release to service been issued before flight at the completion of any maintenance? [Review the certificate of release to service document for correct completion and compliance with all regulatory guidance specified in guidance instructions above].

145.A.50(c) & (e) New defects or incomplete maintenance work orders identified during the above maintenance shall be brought to the attention of the aircraft operator for the specific purpose of obtaining agreement to rectify such defects or completing the missing elements of the maintenance work order. In the case where the aircraft operator declines to have such maintenance carried out under this point, point (e) is applicable. 145.A.50(e) By derogation to point (a), when the organisation is unable to complete all maintenance ordered, it may issue a certificate of release to service within the approved aircraft limitations. The organisation shall enter such fact in the aircraft certificate of release to service before the issue of such certificate.

AMC 145.A.50(e) Certification of maintenance

1. Being unable to establish full compliance with sub-paragraph Part-145.A.50(a) means that the maintenance required by the aircraft operator could not be completed due either to running out of available aircraft maintenance downtime for the scheduled check or by virtue of the condition of the aircraft requiring additional maintenance downtime.
2. The aircraft operator is responsible for ensuring that all required maintenance has been carried out before flight and therefore 145.A.50(e) requires such operator to be informed in the case where full compliance with 145.A.50(a) cannot be achieved within the operator’s limitations. If the operator agrees to the deferment of full compliance, then the certificate of release to service may be issued subject to details of the deferment, including the operator’s authority, being endorsed on the certificate.
Note: Whether or not the aircraft operator does have the authority to defer maintenance is an issue between the aircraft operator and the competent authority of the State of Registry or State of operator, as appropriate. In case of doubt concerning such a decision of the operator, the approved maintenance organisation should inform its competent authority on such doubt, before issuing the certificate of release to service. This will allow this competent authority to investigate the matter with the competent authority of the State of Registry or the State of the operator as appropriate.
3. The procedure should draw attention to the fact that 145.A.50(a) does not normally permit the issue of a certificate of release to service in the case of non-compliance and should state what action the mechanic, supervisor and certifying staff should take to bring the matter to the attention of the relevant department or person responsible for technical co-ordination with the aircraft operator so that the issue may be discussed and resolved with the aircraft operator. In addition, the appropriate person(s) as specified in 145.A.30(b) should be kept informed in writing of such possible non-compliance situations and this should be included in the procedure.
Carry out a product sample of the associated processes for the deferment of incomplete maintenance and /or new defects.
Are procedures followed that ensure all work is completed or deferred, in agreement with the operator and within the limitations of the MEL or approved data of the operator?
Has the maintenance organisation the facility to enter such fact - [when the organisation is unable to complete all maintenance ordered, it may issue a certificate of release to service within the approved aircraft limitations] in the aircraft certificate of release to service before the issue of such certificate?

145.A.50(d) A certificate of release to service shall be issued at the completion of any maintenance on a component whilst off the aircraft. The authorised release certificate ‘EASA Form 1’ referred to in Appendix II of Annex I (Part-M) constitutes the component certificate of release to service except if otherwise specified in point M.A.502(b) or M.A.502(e). When an organisation maintains a component for its own use, an EASA Form 1 may not be necessary depending upon the organisation's internal release procedures defined in the exposition.

Carry out a product sample of the organisations process for the issuance of an EASA form 1.
Has a certificate of release to service been issued at the completion of any maintenance on a component whilst off the aircraft. The authorised release certificate ‘EASA Form 1’ referred to in Appendix II of Annex I (Part-M) constitutes the component certificate of release to service except if otherwise specified in point M.A.502(b) or M.A.502(e). When an organisation maintains a component for its own use, an EASA Form 1 may not be necessary depending upon the organisation's internal release procedures defined in the exposition?