The emergency procedures listed in this section are the recommended practices for handling the aircraft in the event of an aircraft emergency. This guidance should be considered and applied as necessary.

The risk of an emergency can be reduced substantially through proper aircraft maintenance, by performing thorough inspections before and after all flights, and with careful pre-flight planning.

Emergency situations are dynamic events, and not all conditions or procedures can be anticipated or applied during the event. These procedures are not a substitute for a thorough understanding of aircraft systems and sound pilot judgment.

In general, if an emergency occurs, three basic actions can be applied to most situations:

1. Maintain aircraft control—Small emergencies can quickly escalate if the pilot is distracted attempting to troubleshoot the problem. Always maintain visual contact with the aircraft during an emergency to reduce the likelihood of losing orientation.

2. Analyze the situation—Once the aircraft is stabilized, begin to assess the cause of the emergency if practical.

3. Take appropriate action—In many cases, the appropriate action will be to land the aircraft as soon as possible. Always consider the safety of yourself and others before attempting to save the aircraft in an emergency.

If ALTA Pro behaves unexpectedly, neutralize controls by centering the throttle/yaw and pitch/roll sticks and observe ALTA Pro. If it is still flying in an uncommanded manner in either Altitude or Position Mode, switch to Manual Mode. In most cases, unexpected behavior is due to erroneous sensor readings, degraded GPS signal reception, or compass issues.

If the unexpected behavior occurred while in Manual mode, land as soon as possible and check ALTA Pro QGroundControl for any warnings.

Alarm Indication (Flashing or Solid Red Light)

Alarms are displayed if the flight controller determines there is a condition present that can adversely affect the safety of the flight. Alarms are indicated by the Status Light staying or flashing Red (depending on the flight mode).

Land as soon as possible when the Status Light indicate a warning, and investigate the problem while ALTA Pro is safely on the ground. It is best practice to set the mode switch to Manual when an Alarm is observed to maintain full control authority of ALTA Pro.

Regaining spatial orientation as quickly as possible is most important. If the pilot loses orientation of ALTA Pro, control inputs will not give the expected result, so neutralize controls by centering the throttle/yaw and pitch/roll sticks to stabilize motion. If a good GPS signal is available, enable Position Mode so ALTA Pro will stay in one place.

Use yaw only to reorient ALTA Pro so the nose is pointed away, then use the roll control to verify the orientation of ALTA Pro.

If battery cell voltage is below Alarm Voltage (all flight modes)

If battery cell voltage is below Land Voltage while flying in Manual Mode

If battery cell voltage is below Land Voltage while flying in Altitude or Position Mode

If the battery cell voltage drops below the Alarm Voltage, the Status Light will turn solid red in Manual Mode or flash red if in Altitude Hold or Position Hold. Terminate the flight and land as soon as possible.

If the battery cell voltage drops below the Land Voltage, the Status Light will flash red. The orientation lights will flash as described above. The pilot will remain in full control of the ALTA Pro in all three flight modes and full throttle authority is available to the pilot in a battery exhaustion event

Loss of FPV Signal

If visual contact or FPV signal is not maintained:

An FPV Loss of Signal (LOS) can occur if the aircraft flies out of range or if it flies behind an object that interrupts the signal. Maintaining visual contact is the preferred method to re-establish control of the aircraft, either with the pilot seeing the aircraft, or by the use of a visual observer.

Yawing the aircraft can help signal reception if the body of the aircraft is blocking the line of sight between the transmitter and receiver antennas.

If FPV signal or visual contact cannot be maintained, setting the Mode switch to Position Mode and enabling Return-to-Land can be used to bring the aircraft back to signal reception range.

Radio Loss of Signal (LOS)

Loss of Signal (LOS) can occur if the radio controller stops transmitting a signal, or if ALTA Pro is too far away to receive it. In the event ALTA Pro detects a LOS, it will automatically execute a Return-to-Land or Autoland as configured in ALTA Pro QGroundControl if using an S.Bus/S.Bus2 or DSM2/DSMX radio type. While ALTA Pro includes these emergency control modes, it is always recommended to attempt to regain signal link with ALTA Pro to keep the pilot in control of the aircraft.

Move the antenna orientation for best signal strength. Ensure the radio antenna matches the direction of the receiver antennas. Move the radio away from objects to get a clear line-of-sight to ALTA Pro.

Set the Mode switch to Position and the Home switch to Return-to-Land so ALTA Pro will continue to approach the home point if the signal is momentarily regained, resulting in higher likelihood of regaining full signal reception.