OSO 3 – UAS maintained by competent and/or proven entity

AMC1 Article 11 Annex E. Operational Safety Objective 3

CAA ORS9 Decision No. 46

OSO 3 – UAS maintained by competent and/or proven entity

Level of integrity

Criterion	Low (SAIL 1, 2)	Medium (SAIL 3, 4)	High (SAIL 5, 6)
Criterion	OSO3.L.I	OSO3.L.I OSO3.M.I	OSO3.L.I OSO3.M.I OSO3.H.I

Level of assurance

Criterion	Low (SAIL 1, 2)	Medium (SAIL 3, 4)	High (SAIL 5, 6)
Criterion 1 (Procedure)	OSO3.C1.L.A	OSO3.C1.L.A OSO3.C1.M.A	OSO3.C1.L.A OSO3.C1.M.A OSO3.C1.H.A
Criterion 2 (Training)	OSO3.C2.L.A	OSO3.C2.L.A OSO3.C2.M.A	OSO3.C2.L.A OSO3.C2.M.A OSO3.C2.H.A

Low level of robustness (SAIL 1 and 2)

OSO3.L.I

(a) Operator maintenance requirements and maintenance instructions must be defined and adhered to.

(b) Maintenance requirements and instructions must include those developed by the UAS Designer where applicable.

(c) The maintenance Personnel must be competent and must have received an authorisation to carry out maintenance on the UAS.

OSO3.C1.L.A

Criterion 1 – Procedures

(a) The maintenance instructions must be documented.

(b) Any maintenance conducted on the UAS must be recorded in a maintenance log system.

(c) A list of maintenance Personnel authorised to carry out maintenance on the UAS must be established and kept up to date.

(d) The Applicant must declare and provide evidence of compliance with the Integrity requirements. The detailed evidence of compliance may be assessed by the CAA.

OSO3.C2.L.A

Criterion 2 – Training

(a) A record of all relevant qualifications, experience and/or training completed by the maintenance staff must be established and kept up to date.

(b) The Applicant must declare and provide evidence of compliance with the Integrity requirements. The detailed evidence of compliance may be assessed by the CAA.

AMC.OSO3.L.I

(b) The Operator may only use the UAS designer requirements and instructions, or may include additional requirements and instructions over and above those of the UAS Designer.

(c) The maintenance may be performed by an organisation other than the Operator (e.g. use of a third party).

Medium level of robustness (SAIL 3 and 4)

Lower robustness level requirements to be complied with:

• OSO3.L.I

• OSO3.C1.L.A

• OSO3.C2.L.A

Additional requirements to be compiled with:

OSO3.M.I

(a) A maintenance programme must be developed which includes scheduled preventative maintenance of the UAS, derived from the UAS Designer’s scheduled maintenance requirements and adapted to the specificities of the intended operation.

(b) Maintenance and releases to service must be recorded in the maintenance log system.

(c) A maintenance release must be accomplished by Personnel that have received maintenance release authorisation for that UAS model.

OSO3.C1.M.A

Criterion 1 – Procedures

(a) The layout of the UAS maintenance programme must be developed to a standard or means of compliance acceptable to the CAA.

(b) A list of maintenance Personnel authorised to accomplish maintenance releases must be established and kept up to date.

(c) The Applicant must provide evidence of compliance with the Integrity requirements, which will be assessed by the CAA.

OSO3.C2.M.A

Criterion 2 – Training

(a) Initial training syllabus and training standard including theoretical/practical elements, duration, etc. must be defined and commensurate with the authorisation held by the maintenance staff.

(b) For staff holding an authorisation to release to service, the initial training must be specific to the UAS type.

(c) All maintenance staff must have undergone initial training.

(d) The Applicant must provide evidence of compliance with the Integrity requirements, which will be assessed by the CAA.

AMC.OSO3.M.I

Annex E – AMC 1 Integrity and assurance levels for the Operational Safety Objectives (OSO) paragraph 1.5 provides further information about proposing a standard as an AMC.

High level of robustness (SAIL 5 and 6)

Lower robustness level requirements to be complied with:

• OSO3.L.I

• OSO3.C1.L.A

• OSO3.C2.L.A

• OSO3.M.I

• OSO3.C1.M.A

• OSO3.C2.M.A

Additional requirements to be compiled with:

OSO3.H.I

A maintenance procedure manual must be developed which:

(a) Provides information and procedures relevant to the UAS Operator maintenance facility, records, maintenance instructions, maintenance schedule, release to service, tools, material, components, and defect deferrals.

(b) Is followed by the maintenance personnel to carry out maintenance on the UAS.

OSO3.C1.H.A

Criterion 1 – Procedures

The Applicant must provide evidence of compliance with the Integrity requirements, which will be assessed by the CAA. The CAA will validate continuing compliance through oversight.

OSO3.C2.H.A

Criterion 2 – Training

Same as Medium. In addition:

(a) A programme for recurrent training of staff holding an authorization to release to service must be established; and

(b) This programme must be validated by a competent third party.

(c) The Applicant must provide evidence of compliance with the Integrity requirements, which will be assessed by the CAA. The CAA will validate continuing compliance through oversight. The CAA will validate continuing compliance through oversight.

 

GM1 Article 11 Annex E. Operational Safety Objective 3

CAA ORS9 Decision No. 46

GM.OSO3.L.I

(a) The maintenance requirements are the needs for maintenance on the UAS, e.g. inspection after hard landing, regular check of lighting system. The Operator ensures that these requirements are covered in the maintenance instructions.

The maintenance instructions are the information establishing how to carry out the needed maintenance or repairs. These instructions are followed by the maintenance staff while performing maintenance.

(b) The UAS Designer maintenance instructions are sometimes referred to as Instructions for Continued Airworthiness (ICA).

GM.OSO3.C1.L.A

Criterion 1 – Procedures

(a) The purpose of the maintenance log is to record all the maintenance performed on the UAS and the reason why it was performed, e.g. defects or malfunctions rectification, modification, scheduled maintenance, etc.

The maintenance log may be requested for inspection/audit by the CAA during oversight activities.