UAS OSC Volume 2

Operator ID:

UAS Operating Safety Case
Volume 2 - UAS Description:

Document reference number:

Document version and date:

Amendment Number

Date

Amended by

Details of changes

UAS Model

Astro

UAS design & manufaturing organisations

Freefly

Empty Mass

Typical Standard Empty weight:
3,095 g

Maximum Take-Off Mass (MTOM)

Dimensions for Rotorcraft / Multirotor

Length of aircraft body

Width of aircraft body

Height of aircraft body

Unfolded Height:
359 mm

Folded Height:
178 mm

Propeller Configuration

Propeller Dimensions

Sound power level

Any other relevant information

Maximum airspeed

Minimum airspeed to maintain safe flight

Normal/typical operating height

Maximum operating height

Maximum flight time during normal operation

Flight Time (No Payload):
38 min

Maximum flight time on an ISA day at cruising speed at normal/typical operating height.

Maximum flight range on an ISA day (normal and emergency conditions)

Glide distances

Maximum radio range of the C2 Link

Wind speed limits

Turbulence restrictions

Precipitation limits

OAT limits

In-flight icing condition limits

Any other relevant information

Type of material

Material characteristics or properties

Any other relevant information

Batteries:

Battery type, model and manufacturer

Capacity:
157Wh

Type:
Freefly Super Light Batteries (SL8-Air)

Cells:
6S

Cell Chemistry:
Lithium-Ion

Quantity

Arrangement

Generator:

Generator type, model and manufacturer

Specification

Electrical loads

Nominal Battery Voltage:
22.2V

Max Continous Current (10s):
80 A

Max Peak Current (1s):
120 A

Electrical load shedding functionality

BMS:
Redundant BMS with active cell balancing and storage mode

Safety Protections:
overvoltage, overtemperature, over-discharge

Power supply redundancy

Procedures to charge and discharge batteries.

Safety provisions with regards to hazards inherent to high-voltage storage devices:

Procedures in place for safe handling by any person who may come into contact with high-voltage storage devices

Means of identifying high-voltage storage

Safety provisions for any person discovering the UA following an accident.

Procedures and safety provisions to mitigate the risk of battery thermal runaway.

Procedures for monitoring high-voltage storage devices.

HMI:

Information indicated to the remote pilot.

Alert messages indicated to the remote pilot.

Any other relevant information

Operating Temp:
-20 to 50 C

Propulsion type

Powerplant:
Freefly F45

Engines:

Type, model and manufacturer

Propeller type, model and manufacturer

Propellers:
21 x 7.0" (folding)

Material:
Carbon Fiber Reinforced Nylon

Propeller Orientation:
(2) CW and (2) CCW Props

Quantity

Number of Motors:
4

Arrangement

Power output

Motor Max Continuous Power Output:
350 W

Motor Max Instantaneous Peak Power Output:
600 W

Equivalent Kv:
420 Kv

Propeller guards

In-flight restart functionality

Performance monitoring

Health monitoring

Safety features and redundancy in the system that allow maintaining flight after a failure or degradation has occurred in the propulsion system.

Fuel-powered propulsion system – Safety features to mitigate the risk of engine loss when the following hazards occur:

Fuel starvation

Fuel contamination

Failed signal input from the control station

Engine controller failure

Indication to the remote pilot

Electric-powered propulsion system:

Power source and supply management with regards to other systems in the UA

Redundant power sources

Maximum continuous power output of the motor

Maximum peak power output of the motor

Electrical distribution architecture

Electrical load shedding functionality

HMI:

Information indicated to the remote pilot.

Alert messages indicated to the remote pilot.

Any other relevant information

Fuel type

Safety provisions with regards to hazardous substances within the fuel system:

List of hazardous substances and their characteristics.

Procedures in place for safe handling of the UA by any person who may come into contact with the hazardous substances.

Means of identifying the hazardous substances.

Safety provisions for any person discovering the UA following an accident.

HMI:

Information indicated to the remote pilot.

Alert messages indicated to the remote pilot.

Any other relevant information

Design and operation of flight control units, surfaces, actuators, control linkages, etc.

Flight controller:

Type, model and manufacturer

Flight Controller Hardware:
Freefly Custom Designed Skynode

Functions

Flight modes available

Flight Modes:
Manual, Altitude Hold, Position Hold, Autonomous Mission, Return to Land

Automatic functions:

Take-off and landing

Stabilisation

Autopilot

Return to home

If functions are provided by COTS equipment, provide type, model and manufacturer.

Onboard Modules:
Cortex-A53 Computer, LTE

Safety features and redundancy in the system which allow maintaining flight after a failure or degradation of the flight control system, including indication to the remote pilot.

HMI:

Information indicated to the remote pilot.

Alert messages indicated to the remote pilot.

Any other relevant information

Sensors

Type, model and manufacturer

Supported GNSS:
L1/L2 GPS, GLONASS, Beidou and Galileo bands

Quantity

Telemetry links

Method to determine current position.

Method to navigate to intended destination.

Automatic/automated navigation functions

Geo-awareness functions

Containment functions

Safety features and redundancy in the system which allow maintaining flight after a failure or degradation has occurred in the navigation system:

Backup means of navigation

Detection of and response to loss of primary means and secondary means of navigation.

Indication to the remote pilot

HMI:

Information indicated to the remote pilot.

Alert messages indicated to the remote pilot.

Any other relevant information

DAA system functions

Devices used

Technology used

Interface between the DAA system and the flight control computer

Limitations of the DAA system

Evidence of equipment qualification and approval.

DAA event sequence:

Level of automation

Actions required by the remote pilot

Means to verify normal system operation.

HMI:

Information indicated to the remote pilot.

Alert messages indicated to the remote pilot.

Any other relevant information

Power sources, supply management and redundancy.

Radio signal:

Determination of the signal strength and health value.

Threshold values which represent a critically degraded signal.

Control handover between two CUs

Safety features to mitigate the risk of inadvertent command activation:

List of critical commands

Mitigation means

Safety features to mitigate the risk of display or HMI lock-up.

Safety features to maintain flight-critical processing when multiple programs are running concurrently.

HMI:

Information indicated to the remote pilot.

Radio signal strength and/or health indication to the remote pilot.

Alert messages indicated to the remote pilot.

Any other relevant information

RLOS

BRLOS

Antennas:

Type, model and manufacturer

Locations on the UAS

Transceivers / Modems:

Power levels

Transmission schemes

Operating frequencies

Details of frequency spectrum approvals

Maximum power output/range

Type of signal processing

Datalink margin in terms of the overall link bandwidth at the maximum anticipated distance from the CU.

Operational C2 link management:

Frequency switchovers

Contingency situations

Third party link service provider

Radio signal:

Determination of the signal strength and health value

Threshold values which represent a critically degraded signal.

Minimum and average assured data rates

Minimum and average assured latencies

Design features and procedures to maintain availability, continuity, and integrity of the datalink:

RF or other interference

Flight beyond communications range

Antenna masking

Loss of CU functionality

Loss of UA functionality

Atmospheric attenuation

Safety features to mitigate the risk of loss of C2 link:

C2 links redundancy

Automatic triggering of an emergency recovery function

Automatic return to home

Safety features to mitigate the risk of harmful interference.

HMI:

Information indicated to the remote pilot.

Radio signal strength and/or health indication to the remote pilot.

Alert messages indicated to the remote pilot.

Any other relevant information

Antennas:

Type, model and manufacturer

Locations on the UAS

Communication method:

VHF

GSM network

Satellite

Safety features to mitigate the loss of communication function:

Primary communication means

Secondary / back-up communication means

HMI:

Information indicated to the remote pilot.

Radio signal strength and/or health indication to the remote pilot.

Alert messages indicated to the remote pilot.

Any other relevant information

Wheels, skids, rails, launchers, etc.

If various mechanisms can be fitted:

Primary mechanism

Secondary mechanisms

Operational conditions/requirements for each mechanism.

Any other relevant information

Mode of operation

Safety features which mitigate the risk of loss of control or situational awareness.

Means to verify normal system operation.

HMI:

Information indicated to the remote pilot.

Alert messages indicated to the remote pilot.

Any other relevant information

Type, model and manufacturer

Orientation Lights:
Boom tip mounted lights

Orientation Light Color Options:
Colors can be set in software - red, orange, yellow, green, blue, purple, white, off

Locations on the UA

Colour

Operation

Operating modes

Purpose

HMI:

Information indicated to the remote pilot.

Alert messages indicated to the remote pilot.

Any other relevant information

Types

Integrated Payloads:
Gimbaled a7R IV Mapping Camera

Mass

Maximum Gross for Takeoff:
6,665 g (conditional on altitude)

Maximum Payload:
1,500 g

Interfaces with the UA:

Mechanical interface

Payload Mounts:
Vibration Isolated Gimbal Quick Release, Vibration Isolated Cheese Plate, Toad in the Hole

Electrical interface

Data interface

Release mechanism

Gimbal Quick Release Connections:
Power, MAVLink Communication Protocol

Any other interface

Procedures to install the payload onto the UA.

Effects of the payload on the UA

Sensors

Safety features to mitigate the risk of the payload affecting the flight of the UA:

Effects on aerodynamics

Effects of electro-magnetic interference.

Effects of electrical power and / or data connection failures on the UAS.

Effects of complete detachment of the payload from the UA (either caused by a failure or through intentional lowering / dropping of the payload).

Effects of partial detachment of the payload from the UA.

Distraction of the remote pilot generated by the payload during flight.

Procedures to verify the attachment points to the UA.

Procedures to verify the UA MTOM and CG location.

Procedures to detect and mitigate any failure of the payload in flight.

Safety provisions with regards to hazards inherent to the payload

Procedures in place for safe handling of the payload.

Means of identifying hazards.

HMI:

Information indicated to the remote pilot.

Alert messages indicated to the remote pilot.

Any other relevant information

UAS launch and recovery systems

Power sources

Transportation equipment

Backup or emergency equipment

Procedures to transport UA, CU, battery/fuel, and other equipment between operation sites and from the loading/off-loading area to the take-off/landing area.

Storage of ground support equipment.

Suitability of the ground support equipment and transportation method with regards to the UAS components’ fragility, sensitivity or inherent hazards.

Ground support equipment standards

Ground support equipment manufacturer's recommendations.

Any other relevant information

Maintenance manual:

Structure

Maintenance procedures:

Inspections

Overhaul

Repairs

Assurance of repair procedures

Batteries maintenance during storage periods

Origin of each procedure

Maintenance schedules

Procedures to record maintenance that has been carried out.

Storage of maintenance records

Staff qualification and levels of approval.

Procedures to use the manual by the Maintenance staff

Configuration control

Any other relevant information

Sources of procurement

Process to confirm the suitability of the part.

Any other relevant information

Hardware, software, and firmware version control

Modification standards

Modification records storage

Safety assessment associated with the modification

Any other relevant information

Step 1 – Identify the main functions of the UAS.

Step 2 – Identify the sub-functions.

Step 3 – Consider the ways each function may fail.

Step 4 – Identify the failure conditions.

Step 5 – Select those failure conditions that may lead to mid-air collision or harm to uninvolved people on the ground. (Identified Hazard)

Step 6 – Assurance

Step 7 – Describe the consequence of the failure condition.

Step 8 – Describe the failure modes. (Unmitigated Failures)

Step 9 – Identify the single points of failure.

Step 10 – Describe the risk mitigation means.

Dimensions

Motors and Propellers

Battery

Payloads and Weight

Flight Controller

MISC.