3.1. Alta Maintenance Schedule
Preventative maintenance shall be performed at intervals in accordance with the chart below:
|Prior to every project
|POH Aircraft Checks
|Once Per Day - Visual
|Technical Manual - 3.2 Visual Inspection
|Once Per Day - GPS Care
|Technical Manual - 3.3 GPS Care Procedure
|Every 60 flights or every
Technical Manual - 3.4 Alta Routine
|Every 60 flights or every
|Technical Manual - 3.5 SR Routine
|Every 300 Flights
|*Depot maintenance only - Placard marking
date of last maintenance
Unscheduled Maintenance (Common)
|Technical Manual - 4.1 Propeller Replacement
|Drone and GCS
|Contact Tech Support
|As Required after airframe
|Technical Manual - 4.2 Field Evaluation
|As Prescribed by Tech Support
|Contact Tech Support
Daily Field Inspection
A comprehensive physical inspection of the aircraft is required on a daily basis in addition to the
pre-flight inspections prescribed in section 4.c. of this document.
a. Toad Mount
b. FPV System
2. Landing Gear
3. Landing Gear
6. Arm Clips
7. GPS Care
8. Check that the battery cage and landing gear assembly is properly assembled and secured to the aircraft.
a. Use a 2.0 mm hex driver to check that the 8 screws in the upper rectangular plate, 2 in
each corner, are secure and in good condition.
b. Use a 2.5 mm hex driver and 5.5 mm to secure the 3 landing gear legs in the tube clamps. When secure, all 12 nuts should be tight and the landing gear legs should not rotate.
c. With the landing gear tripod assembly resting on a flat surface, press down on the
female toad of the landing. The landing gear should feel secure and no cracking should
d. Mount the aircraft on the landing gear so that the FPV camera is directly between the
two font landing gear legs. The battery stop of the battery cage should be below the FPV
camera. Ensure that the toad latch engages fully and the aircraft does not rotate.
Use a 2.5 mm hex driver to adjust the set screw of the toad latch as necessary.
e. If necessary, a 2.5 mm hex driver can be used to adjust the smaller outer legs of the
landing gear to provide proper clearance below the underside of the aircraft and above
the ground. Ensure that these screws are fully tightened.
9. Check all Alta arm clips for proper engagement per the Normal Operating Checklist. Check that the Alta arm clips properly and fully engage so that the arms cannot fold. The sliding mechanism should move smoothly and readily spring back when released. Most importantly, visually confirm that the sliding tab engages with the metal retaining sleeve.
10. Check the Alta propeller sets and motors for integrity and security per Normal Operating
a. Check for nicks, dings, cracks, or delamination of each blade by carefully running a hand along the leading edge out to the tip. If a propeller blade is found to be damaged, replace the entire two-blade assembly.
b. Check that the pivot bolt of each blade is appropriately tight. The blades should be free to rotate into a deployed position but should not be able to twist about its long axis.
c. Check that the bells of the motors are secure by pulling upward on the propeller hub of each motor.
d. Spin each motor by hand and look, listen, and feel for signs of damage or debris within the motors. If motors are damaged or do not spin freely for any reason, report to SkySpecs Tech Support.
11. Install batteries in the Alta, but do not connect them yet.
12. TBS ONLY: Verify the transmitter frequency.
Power on the TBS RC transmitter and verify the frequency is correct. Access Menu > Device > XF Micro TX > General > Frequency and select the appropriate frequency based on region:
Europe: 868 MHz
North America: 915MHZ
13. Complete the RC Receiver Binding Procedure found in a separate document for Futaba and TBS RC systems
14. Leave the RC transmitter on while the Alta is on and connect to the aircraft using
the Alta app.
15. Access the Monitor screen of the Freefly Alta app and check for any red errors.
16. Attempt to resolve any compass errors by performing a compass calibration:
a. In the app, access Configurations > More > Compass.
b. Under Calibration, select Manual Start on the bottom right.
c. Follow the prompts in the app.
d. Once the process is complete, check that the app reports “Calibration
17. If able to place the aircraft outdoors, check the Monitor menu of the Alta app to confirm that the Alta GPS is reporting satellites (usually 6-9).
18. Check the Alta motion boot settings under Configuration > Safety per the following standard:
Motion Boot OFF for Onshore Operations
Motion Boot ON for Offshore Operations
If the settings must be changed, reboot the Alta on land to ensure that the change persists and the Alta boots properly.
19. Report any abnormal errors in the Alta app to SkySpecs Technical Support.
20. Use the Configuration > LEDs sub-menu of the Alta app to adjust the color of the orientation
LEDs to the preferred colors based on pilot preference.
21. Check that the Alta status LED is flashing white.
22. Check the FPV monitor:
a. Check the quality of the image from the fixed camera on the aircraft. Adjust the channel on the monitor as necessary.
b. Verify the ! symbol does not appear.
c. Check that the RC signal lost symbol does not appear.
23. At this point, a check flight of the Alta without the Sensor Rig may be performed, but only if it can be done safely. This check should absolutely be performed before embarking on far offshore operations.
a. Begin with a pitch and roll check on the ground with the motors at idle. Using minimal
inputs, pitch forward, pitch back, roll left, roll right. Ensure that the aircraft responds
appropriately. Be prepared to disarm the motors if it appears that the aircraft is about to
b. When satisfied, throttle up into a low hover at about 5 meters and check that the aircraft
is flying normally. Perform a pitch and roll check in the air and ensure that the aircraft
responds appropriately. Start with small inputs and gradually increase the magnitude of
the inputs to check that the aircraft is assembled properly.
c. Switch the aircraft into Position mode and check for proper position and altitude hold.
d. Monitor the FPV and OSD for clarity of signal and for alerts.
e. Upon landing, check for excessive heat on any of the motors or the battery leads.
Sensor Rig Checks
It is more beneficial to conduct these checks outdoors but they are still of value if conducted indoors.
1. Remove the rear panel and check that the 2 shock stickers are still white and have not
a. External shock sticker on top of the upper carbon fiber plate.
b. Internal shock sticker on top of the Spatial Dual INS unit.
If either of these stickers are tripped, report the findings to SkySpecs Tech Support.
Continue the assembly of the SR in order to complete an evaluation of the Spatial Dual.
2. Check that the Sensor Rig can be securely mounted to the Alta. Mount the SR on the Alta so that the camera gimbal is facing forward, directly above the FPV camera. Ensure that the toad latch engages fully and the SR does not rotate. Use a 2.5 mm hex driver to adjust the set screw of the toad latch as necessary.
3. Check that the 2 GPS arms of the Sensor Rig are securely mounted per the Normal Operating Checklist.
a. Use a 2.0 mm hex driver to loosen the 4 GPS arm tube clamp screws on either side of the LIDAR. It is important to loosen these screws no more than one full turn.
b. Insert a GPS arm into the left side of the SR, Noting the natural twist of the GPS cable can make it easier to connect the cables later. With the rear panel removed, it is easier to guide the horizontal tube of the arm through the 2 tube clamps on that side.
c. With one hand, hold the GPS arm so that the end of the horizontal tube is directly under the LIDAR bolt in the center of the underside of the upper carbon fiber plate.
Simultaneously, orient the vertical arm tube and attached antenna directly upward.
With the other hand, use the 2.0 mm hex driver to re-tighten the 4 GPS arm tube clamp screws on the left side. Make small adjustments to the orientation of the arm to keep it in the correct position until all 4 screws are tight. Once tightened, the GPS arm should not twist.
d. Use the SMA torque wrench to check the tightness of the inner nuts on the Spatial Dual.
Then hand thread the GPS cable onto the Primary Spatial Dual antenna port
on the left. Use the SMA torque wrench to tighten the captive nut on the end
of the cable until the torque wrench clicks.
e. Repeat the previous steps to install the right GPS arm, connecting the cable to the Secondary Spatial Dual antenna port on the right, Never cross the GPS cables.
4. Check that the camera is mounted to the gimbal properly per the Normal Operating
a. Mount the camera on the gimbal so that the camera is pointing straight forward, the camera bolt is hand tight and the gimbal is balanced. If the rear of the camera overhangs the rear edge of the gimbal mounting plate by about 5 mm the camera should be close to balancing. This will also allow the camera battery hatch to open.
b. Fully insert the right angle camera micro USB cable into the port on the side of the camera. Ensure that it is fully inserted and secure.
c. Lower the curved clamping plate so that it applies pressure on the top of the camera to keep it secure and oriented straight. Use a 2.0 mm hex driver to secure the screws on either side.
5. Check that the gimbal and associated cables are in good condition and free to move per the Normal Operating Checklist. Look for nicks or other damage to the cable shielding. Rotate the gimbal 90 degrees
back and forth in both pitch and roll, checking that the gimbal is free to move, neither snagged by cables or hindered by debris in the motors.
6. Connect the SR Pass Blocks USB-C cable to the port in the top of the Pass Blocks on the front of the Alta. Ensure that the connector clicks into place and is fully inserted.
7. Power on the GCS tablet and check the battery level. Begin charging as appropriate.
8. Connect the GCS radio module to GCS tablet via USB cable. Ensure that the USB icon on the USB-A connector is facing toward the screen. Check that the GCS Statham screen reports “Ground Radio Active” in green in the lower left.
9. Ensure that the SR telemetry antenna is installed, secure, and oriented correctly. It may be necessary to use the SMA torque wrench to tighten the inner nut which presses against the carbon fiber panel before re-installing the antenna. The antenna should be pointed straight out from the side panel, parallel to the
10. Power on the Sensor Rig using Sensor Rig power adapter and allow the SR to boot up as indicated by the gimbal turning on. This may take up to 5 minutes. Check that the GCS connects to the Sensor Rig and the Tower Info page appears.
11. Check that the gimbal initializes properly, holding a straight and level orientation.
12. Check the firmware version on the Inspection Setup screen and coordinate a Firmware. Update with Tech Support. Even if a new version has not been released, it may be necessary to perform an update to a different firmware modifier based on the type of turbine being inspected and scenario. Common firmware modifiers include:
a. Standard Turbines (Clean)
b. Direct Drive Turbines
c. Offshore Turbines
d. Short Turbines
e. Stall Tip Turbines
f. Trailing-Edge Out Turbines
g. Areas with Tall Obstacles
h. Combinations Thereof
13. After updating firmware and rebooting as necessary, select 1 flight and press the Submit button on the Inspection Setup screen.
14. Execute the Gimbal Pointing Test under the Advanced button on the top right. The gimbal should move smoothly, pointing down first and then rolling left. When successful, all of the green circles on the pointing test pop-up should be green. Adjust the gimbal cables and camera balance and repeat the test until it completes successfully.
15. Confirm the following messages in the debug section of the GCS on the right. It may take up to 5 minutes for all to appear:
a. Sensors: Active
b. Pilot: Active
c. Primary Receiver: Active
d. Backup Receiver: Active
e. GPS Status: Nominal
f. Lidar: Active
g. Camera: Active
h. Gimbal: Active
i. Power Board: Active
16. Connect the SR power cable to the power splitter harness on the rear right side of the aircraft.
17. If able take the SR outdoors to an open area. Power on the aircraft and check that the GNSS begins to count down to convergence. This may take some time, up to 20 minutes, especially if the SR has not been powered for an extended period of time. Make sure that the bound RC transmitter is powered on with
switches in safe positions whenever the aircraft is powered on.If properly functioning, all of the debug statuses on the right side of the GCS should be white once the GNSS converges, including Pass Blocks: Active, Pilot: Active, and both RC receivers.
18. When satisfied that no further maintenance is required, secure the rear panel of the SR with 4 thumb screws.
19. At this point, an optional manual check flight of the Alta with the Sensor Rig may be performed but only if it can be done safely.
a. An idle only takeoff may be used to test the GCS but the system should not be switched into Auton.
b. Perform a pitch and roll check to ensure that the aircraft responds appropriately. Start with small inputs and gradually increase the magnitude of the inputs to check that the aircraft is assembled properly and the SR is secure. This is also an opportunity to check for excessive dual headings or camera inactive.