COT – Containment requirements (Tethered operations)

AMC1 Article 11 Annex E. Containment requirements (tether)

CAA ORS9 Decision No. 46

Level of integrity

Criterion	Low (SAIL 2, 3)	Medium (SAIL 4, 5)	High (SAIL 6)
Criterion 1 (Technical design)	COT.C1.L.I	COT.C1.L.I	COT.C1.L.I
Criterion 2 (Procedures)	COT.C2.L.I	COT.C2.L.I	COT.C2.L.I

Level of assurance

Criterion	Low (SAIL 2, 3)	Medium (SAIL 4, 5)	High (SAIL 6)
Criterion 1 (Technical design)	COT.C1.L.A	COT.C1.L.A	COT.C1.L.A
Criterion 2 (Procedures)	COT.C2.L.A	COT.C2.M.A	COT.C2.M.A COT.C2.H.A

Criterion

Low (SAIL 2, 3)

Medium (SAIL 4, 5)

High (SAIL 6)

Criterion 1 (Technical design)

COT.C1.L.A

Criterion 2 (Procedures)

COT.C2.L.A

COT.C2.M.A

COT.C2.H.A

Low level of robustness

COT.C1.L.I

Criterion 1 – Technical design

(a) The length of the tether must be adequate to contain the UA within the operational volume.

(b) The strength of the line must be compatible with the ultimate loads during the operation.

(c) The strength of the tether attachment points must be compatible with the ultimate loads expected during the operation.

(d) It must not be possible for the tether to be cut by a rotating propeller.

COT.C2.L.I

Criterion 2 – Procedures

Procedures must be developed to install and periodically inspect the condition of the tether.

COT.C1.L.A

Criterion 1 – Technical design

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

(b) Compliance evidence must include the tether material specifications.

(c) If compliance evidence is provided through simulation, the validity of the target environment used in the simulation must be justified.

(d) If (a), (b), (c) and Integrity requirements are complied with through a SAIL mark certificate, the Applicant must demonstrate that:

(1) The length of the tether is adequate to contain the UA within the intended operational volume.

(2) The ultimate loads considered by the Designer will not be exceeded during the intended operation.

COT.C2.L.A

Criterion 2 – Procedures

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

(b) If simulation is used to demonstrate the adequacy of the procedures, the simulation must be proven valid for the intended purpose with positive results.

(c) If (a), (b) and Integrity requirements are complied with through a SAIL mark certificate, the Applicant must demonstrate that the procedures provided by the Designer are followed by the Operator.

Medium level of robustness

Lower robustness level requirements to be complied with:

• COT.C1.L.I

• COT.C1.L.A

• COT.C2.L.I

• COT.C3.L.A

Additional requirements to be compiled with:

COT.C1.M.I

Criterion 1 – Technical design

No additional requirements.

COT.C2.M.I

Criterion 2 – Procedures

No additional requirements.

COT.C1.M.A

Criterion 1 – Technical design

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

COT.C2.M.A

Criterion 2 – Procedures

(a) The procedures must be developed to a standard or means of compliance acceptable to the CAA.

(b) The adequacy of the procedures must be demonstrated through either of the following methods:

(1) Dedicated flight test.

(2) Simulation, provided that the simulation is proven valid for the intended purpose with positive results.

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

AMC.COT.C2.M.A

Criterion 2 – Procedures

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

Lower robustness level requirements to be complied with:

• COT.C1.L.I

• COT.C1.L.A

• COT.C2.L.I

• COT.C2.L.A

• COT.C2.M.A

Additional requirements to be compiled with:

COT.C1.H.I

Criterion 1 – Technical design

No additional requirements.

COT.C2.H.I

Criterion 2 – Procedures

No additional requirements.

COT.C1.H.A

Criterion 1 – Technical design

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.

COT.C2.H.A

Criterion 2 – Procedures

(a) The flight tests performed to validate the procedures must cover the entire flight envelope or be demonstrated to be conservative.

(b) If (a) and Integrity requirements are complied with through a SAIL mark certificate, the Applicant must demonstrate that the flight envelope of the intended operation is the same as or contained within the flight envelope considered by the Designer.

(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.

GM1 Article 11 Annex E. Containment requirements (tether)

CAA ORS9 Decision No. 46

GM.COT

This section provides the containment requirements which address the specific use of a tether, for the following 3 levels of robustness: low, medium and high.

This section is an alternative to COT – Containment requirements.

GM.COT.C1.L.I

Criterion 1 – Technical design

(b) Ultimate loads are the maximum loads expected to be exerted by the UAS on the tether during the operation, including all possible nominal and failure scenarios, and multiplied by a safety factor of 1.5.

GM.COT.C2.L.I

Criterion 2 – Procedures

(a) Designer procedures should be followed by the Operator where available.

GM.COT.C1.L.A

Criterion 1 – Technical design

(a) Compliance evidence is typically provided through testing or operational experience.

(b) Designer data is found on the SAIL mark certificate.

GM.COT.C2.L.A

Criterion 2 – Procedures

GM.COT.C2.H.A

Criterion 2 – Procedures

(b) Designer data is found on the SAIL mark certificate.