Validator servo_rs485_connection
Viewing this guide for
Applicable alarms (4)
MOTOR_CONTROL_FEEDBACK_SERVO_WING_PORT_FWD_UNAVAILABLEMOTOR_CONTROL_FEEDBACK_SERVO_WING_STBD_FWD_UNAVAILABLEWING_PORT_MISSING_FEEDBACKWING_STBD_MISSING_FEEDBACK
Likely outcomes — click to expand
Based on 850,133 missions where this alarm fired in the last
90 days
(for MOTOR_CONTROL_FEEDBACK_SERVO_WING_PORT_FWD_UNAVAILABLE) as of 2026-10-13
Grounding vs discrepancy (of 4,385 ZERP issues filed on these missions)
Top work orders
- EV2: Inspect Aircraft after Droid Left Behind (DLB) · MAINTENANCE_ACTION 228
- EV3: Inspect Aircraft after Droid Left Behind (DLB) · MAINTENANCE_ACTION 214
- Inspect Droid after Droid Left Behind (DLB) · MAINTENANCE_ACTION 184
- Reset Droid after DLB · REPAIR 117
- Troubleshoot Hover Motor Resistance on Aircraft · INSPECTION 77
Frequently replaced parts
| Part | P/N | Removals |
|---|---|---|
| SERVO, ASSY, UNIVERSAL, P2 | 20398 | 1,095 |
| CCW HOVER MOTOR ASSY, EV3 ZIP, P2 | 19607 | 853 |
| ASSY, SPOOL AND LINE, DOCKING FIN | 48477 | 779 |
| PRE-PREG TAIL ASSY STBD(RH), ZIP, P2 | 21840 | 624 |
| TAIL PORT, ZIP, P2 | 31280 | 594 |
Aggregated from fleet operations and refreshed daily. Individual outcomes may vary by site and configuration.
Validators
Section titled “Validators”Use this topic when a maintenance validator result or service workflow points to a servo RS-485 communication issue.
The failed result may appear as one of these checks:
servo_rs485_connection/<servo>/SERVO_MISSINGservo_rs485_connection/<servo>/CONNECTION_UNRELIABLEservo_rs485_connection/<servo>/LINK_INTEGRITY
The <servo> value identifies which servo path to inspect. Match that servo to the work order template in the first troubleshooting step.
Background
Section titled “Background”This validator checks whether each expected servo connection was present and communicating during the maintenance run. A failure usually means one of these issues is present on the affected servo path:
- A servo or connector is disconnected or not fully seated
- A harness or flex is damaged
- The downstream servo or LRU was not powered when expected
- The connection is intermittent or noisy
The failing check name identifies which servo path to inspect:
- servo_tail_stbd_fwd (Suspected LRUs: starboard ruddervator servo, tail node)
- servo_tail_port_fwd (Suspected LRUs: port ruddervator servo, tail node)
- servo_wing_stbd_fwd / servo_wing_stbd_fwd_comms (Suspected LRUs: starboard wing servo, starboard forward hover flex, starboard aft hover motor)
- servo_wing_port_fwd / servo_wing_port_fwd_comms (Suspected LRUs: port wing servo, port forward hover flex, port aft hover motor)
- servo_roll (Suspected LRUs: roll servo, tail node)
- servo_tilt (Suspected LRUs: tilt servo, tail node)
- servo_door (Suspected LRUs: droid door servo, droid aft brain flex, droid aft motor node [AMN])
The validator produces two L1 maintenance checks per configured servo:
servo_rs485_connection/<servo>/SERVO_MISSING: the validator saw no communication from that servo while it was expected to be powered.servo_rs485_connection/<servo>/CONNECTION_UNRELIABLE: the validator saw communication from that servo, but the connection quality was poor.
If SERVO_MISSING fails, treat that as the primary issue for the affected servo.
View Validator Results
Section titled “View Validator Results”Load the failed maintenance validator results for the affected mission and check for servo_rs485_connection failures before starting troubleshooting.
NOTE: Validator results may take a while to show up. If you don’t see them immediately, check back in 15-30 minutes after the flight has ended.
Troubleshooting Steps
Section titled “Troubleshooting Steps”graph TD
open-failed-maintenance-validators["<small><b>Step 1</b></small><br/>Telemetry: Load the failed maintenance validator..."]
are-you-troubleshooting-ev2-or-ev3{"<small><b>Step 2</b></small><br/>Question: Are you troubleshooting an EV2 or EV3..."}
is-the-affected-servo-wing-forward{"<small><b>Step 3</b></small><br/>Question: Check the value in the failing val..."}
is-this-a-commercial-zip-or-test-zip{"<small><b>Step 4</b></small><br/>Question: Is this a commercial Zip or a test Zip?"}
select-the-ev3-servo-path{"<small><b>Step 5</b></small><br/>Question: Check the value in the failing val..."}
does-the-asset-have-ev2-test-install-m5-bracket{"<small><b>Step 6</b></small><br/>Question: Does this asset have a previous insta..."}
create-work-order-servo-and-associated-flex-swap["<small><b>Step 7</b></small><br/>Action: Based on the alarm, create work order..."]
assign-ev2-test-install-m5-bracket-and-swap["<small><b>Step 8</b></small><br/>Action: Assign and install 1103: EV2 Test I..."]
create-work-order-servo-and-associated-prepped-hover-harness-swap["<small><b>Step 9</b></small><br/>Action: Create a work order to swap the affec..."]
ev3-inspect-servo-path{"<small><b>Step 10</b></small><br/>Question: Inspect the Hirose connector, servo w..."}
ev3-hirose-connector-condition{"<small><b>Step 11</b></small><br/>Question: What issue did you find with the Hiro..."}
ev3-plug-in-hirose-connector["<small><b>Step 12</b></small><br/>Action: Plug in the Hirose connector. Confirm..."]
ev3-swap-servo-or-associated-hardware["<small><b>Step 13</b></small><br/>Action: Swap the servo or associated hardware..."]
ev3-replace-lru-associated-with-damaged-hardware["<small><b>Step 14</b></small><br/>Action: Replace the affected servo. Template:..."]
ev3-swap-flex-and-inform-avionics{"<small><b>Step 15</b></small><br/>Question: Swap the Distro Winch Tail Flex Harn..."}
ev3-samtec-connector-condition{"<small><b>Step 16</b></small><br/>Question: What issue did you find with the SAMT..."}
ev3-install-samtec-spring-clip["<small><b>Step 17</b></small><br/>Action: Install or reconnect the SAMTEC sprin..."]
ev3-swap-flex-and-ship-hardware["<small><b>Step 18</b></small><br/>Action: Swap the flex harness and ship the da..."]
is-there-past-tail-tilt-roll-servo-flex-inspection{"<small><b>Step 19</b></small><br/>Question: Is there a completed instance of EV2..."}
is-there-past-tail-servo-flex-inspection{"<small><b>Step 20</b></small><br/>Question: Is there a completed instance of EV2..."}
assign-ev2-roll-tilt-servo-flex-inspection{"<small><b>Step 21</b></small><br/>Question: Assign EV2 Ops: Tail/Tilt/Roll Servo..."}
assign-ev2-tail-servo-flex-inspection{"<small><b>Step 22</b></small><br/>Question: Assign EV2 Ops: Tail/Tilt/Roll Servo..."}
if-there-is-no-visible-damage-on-the-fl{"<small><b>Step 23</b></small><br/>Question: Is there a previous instance of the f..."}
assign-ev2-commercial-servo-flex-inspection{"<small><b>Step 24</b></small><br/>Question: Assign EV2 Commercial Ops: Wing Serv..."}
inspect-wing-forward-servo-path{"<small><b>Step 25</b></small><br/>Question: Inspect the M5 connector, M5 Servo wi..."}
tighten-the-m5-connector-and-re-apply{"<small><b>Step 26</b></small><br/>Question: Tighten the M5 connector and re-apply..."}
inspect-remaining-wing-forward-servo-path{"<small><b>Step 27</b></small><br/>Question: Inspect the remaining M5 Servo wire h..."}
swap-servo-and-flex-harness-after-retrofit{"<small><b>Step 28</b></small><br/>Question: Swap the servo and flex harness. Perf..."}
swap-the-flex-harness-and-inform-avionic{"<small><b>Step 29</b></small><br/>Question: Swap the flex harness. Use one of the..."}
assign-the-m5-connector-bracket-retrofit["<small><b>Step 30</b></small><br/>Action: Assign 1038: ZCO-2026-06-11 M5 Conn..."]
general-inspect-servo-path{"<small><b>Step 31</b></small><br/>Question: Inspect the M5 connector, M5 Servo wi..."}
general-tighten-the-m5-connector-and-re-apply{"<small><b>Step 32</b></small><br/>Question: Tighten the M5 connector and re-apply..."}
general-inspect-remaining-servo-path{"<small><b>Step 33</b></small><br/>Question: Inspect the remaining M5 Servo wire h..."}
general-replace-the-lru-associated-with-the-dam{"<small><b>Step 34</b></small><br/>Question: Replace the LRU associated with the d..."}
general-swap-the-flex-harness-and-inform-avionic{"<small><b>Step 35</b></small><br/>Question: Swap the flex harness. Perform a Main..."}
general-if-there-is-no-visible-damage-on-the-fl{"<small><b>Step 36</b></small><br/>Question: Swap the Distro Winch Tail Flex Harn..."}
escalate-to-p2-avionics-hardware{{"<small><b>Step 37</b></small><br/>Escalation: Escalate to P2 Avionics Hardware On C..."}}
the-aircraft-may-return-to-service("<small><b>Step 38</b></small><br/>Reference: The Aircraft may return to service.")
escalate-to-p2-avionics-hardware-on-cal{{"<small><b>Step 39</b></small><br/>Escalation: Escalate to P2 Avionics Hardware On C..."}}
escalate-to-p2-firmware-platform{{"<small><b>Step 40</b></small><br/>Escalation: Escalate to P2 Firmware Platform On C..."}}
open-failed-maintenance-validators -->|Yes| are-you-troubleshooting-ev2-or-ev3
open-failed-maintenance-validators -->|No| escalate-to-p2-firmware-platform
are-you-troubleshooting-ev2-or-ev3 -->|EV2| is-the-affected-servo-wing-forward
are-you-troubleshooting-ev2-or-ev3 -->|EV3| select-the-ev3-servo-path
is-the-affected-servo-wing-forward -->|Wing-forward| is-this-a-commercial-zip-or-test-zip
is-the-affected-servo-wing-forward -->|Roll/Tilt| is-there-past-tail-tilt-roll-servo-flex-inspection
is-the-affected-servo-wing-forward -->|Tail| is-there-past-tail-servo-flex-inspection
is-this-a-commercial-zip-or-test-zip -->|Commercial| if-there-is-no-visible-damage-on-the-fl
is-this-a-commercial-zip-or-test-zip -->|Test| does-the-asset-have-ev2-test-install-m5-bracket
select-the-ev3-servo-path -->|Wing-forward| create-work-order-servo-and-associated-prepped-hover-harness-swap
select-the-ev3-servo-path -->|Roll or tilt| ev3-inspect-servo-path
select-the-ev3-servo-path -->|Tail| ev3-inspect-servo-path
does-the-asset-have-ev2-test-install-m5-bracket -->|Yes| create-work-order-servo-and-associated-flex-swap
does-the-asset-have-ev2-test-install-m5-bracket -->|No| assign-ev2-test-install-m5-bracket-and-swap
ev3-inspect-servo-path -->|Hirose connector| ev3-hirose-connector-condition
ev3-inspect-servo-path -->|Servo wires| ev3-replace-lru-associated-with-damaged-hardware
ev3-inspect-servo-path -->|Flex harness| ev3-swap-flex-and-inform-avionics
ev3-inspect-servo-path -->|SAMTEC connector| ev3-samtec-connector-condition
ev3-inspect-servo-path -->|None| general-if-there-is-no-visible-damage-on-the-fl
ev3-hirose-connector-condition -->|Not plugged in| ev3-plug-in-hirose-connector
ev3-hirose-connector-condition -->|Broken/other issue| ev3-swap-servo-or-associated-hardware
ev3-swap-flex-and-inform-avionics -->|Yes| the-aircraft-may-return-to-service
ev3-swap-flex-and-inform-avionics -->|No| escalate-to-p2-avionics-hardware-on-cal
ev3-samtec-connector-condition -->|Spring clip missing/not con...| ev3-install-samtec-spring-clip
ev3-samtec-connector-condition -->|Connector damaged| ev3-swap-flex-and-ship-hardware
is-there-past-tail-tilt-roll-servo-flex-inspection -->|Yes| escalate-to-p2-avionics-hardware-on-cal
is-there-past-tail-tilt-roll-servo-flex-inspection -->|No| assign-ev2-roll-tilt-servo-flex-inspection
is-there-past-tail-servo-flex-inspection -->|Yes| escalate-to-p2-avionics-hardware-on-cal
is-there-past-tail-servo-flex-inspection -->|No| assign-ev2-tail-servo-flex-inspection
assign-ev2-roll-tilt-servo-flex-inspection -->|Yes| the-aircraft-may-return-to-service
assign-ev2-roll-tilt-servo-flex-inspection -->|No| escalate-to-p2-avionics-hardware-on-cal
assign-ev2-tail-servo-flex-inspection -->|Yes| the-aircraft-may-return-to-service
assign-ev2-tail-servo-flex-inspection -->|No| escalate-to-p2-avionics-hardware-on-cal
if-there-is-no-visible-damage-on-the-fl -->|Yes| assign-ev2-commercial-servo-flex-inspection
if-there-is-no-visible-damage-on-the-fl -->|No| assign-the-m5-connector-bracket-retrofit
assign-ev2-commercial-servo-flex-inspection -->|Yes| the-aircraft-may-return-to-service
assign-ev2-commercial-servo-flex-inspection -->|No| escalate-to-p2-avionics-hardware-on-cal
inspect-wing-forward-servo-path -->|M5 connector| tighten-the-m5-connector-and-re-apply
inspect-wing-forward-servo-path -->|M5 servo wire harness| swap-servo-and-flex-harness-after-retrofit
inspect-wing-forward-servo-path -->|Flex harness| swap-the-flex-harness-and-inform-avionic
inspect-wing-forward-servo-path -->|None| general-if-there-is-no-visible-damage-on-the-fl
tighten-the-m5-connector-and-re-apply -->|Yes| the-aircraft-may-return-to-service
tighten-the-m5-connector-and-re-apply -->|No| inspect-remaining-wing-forward-servo-path
inspect-remaining-wing-forward-servo-path -->|M5 servo wire harness| swap-servo-and-flex-harness-after-retrofit
inspect-remaining-wing-forward-servo-path -->|Flex harness| swap-the-flex-harness-and-inform-avionic
inspect-remaining-wing-forward-servo-path -->|None| general-if-there-is-no-visible-damage-on-the-fl
swap-servo-and-flex-harness-after-retrofit -->|Yes| the-aircraft-may-return-to-service
swap-servo-and-flex-harness-after-retrofit -->|No| escalate-to-p2-avionics-hardware
swap-the-flex-harness-and-inform-avionic -->|Yes| the-aircraft-may-return-to-service
swap-the-flex-harness-and-inform-avionic -->|No| escalate-to-p2-avionics-hardware-on-cal
general-inspect-servo-path -->|M5 connector| general-tighten-the-m5-connector-and-re-apply
general-inspect-servo-path -->|M5 servo wire harness| general-replace-the-lru-associated-with-the-dam
general-inspect-servo-path -->|Flex harness| general-swap-the-flex-harness-and-inform-avionic
general-inspect-servo-path -->|None| general-if-there-is-no-visible-damage-on-the-fl
general-tighten-the-m5-connector-and-re-apply -->|Yes| the-aircraft-may-return-to-service
general-tighten-the-m5-connector-and-re-apply -->|No| general-inspect-remaining-servo-path
general-inspect-remaining-servo-path -->|M5 servo wire harness| general-replace-the-lru-associated-with-the-dam
general-inspect-remaining-servo-path -->|Flex harness| general-swap-the-flex-harness-and-inform-avionic
general-inspect-remaining-servo-path -->|None| general-if-there-is-no-visible-damage-on-the-fl
general-replace-the-lru-associated-with-the-dam -->|Yes| the-aircraft-may-return-to-service
general-replace-the-lru-associated-with-the-dam -->|No| escalate-to-p2-avionics-hardware-on-cal
general-swap-the-flex-harness-and-inform-avionic -->|Yes| the-aircraft-may-return-to-service
general-swap-the-flex-harness-and-inform-avionic -->|No| escalate-to-p2-avionics-hardware-on-cal
general-if-there-is-no-visible-damage-on-the-fl -->|Yes| the-aircraft-may-return-to-service
general-if-there-is-no-visible-damage-on-the-fl -->|No| escalate-to-p2-avionics-hardware-on-cal
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style escalate-to-p2-firmware-platform fill:#fef3c7,stroke:#f59e0b,color:#78350f Hover or focus a block to preview it. Select the block to keep the preview open.
1 telemetry
Load the failed maintenance validator results for the affected mission. Review whether any
NOTE: Validator results may take 15-30 minutes after the flight ends to appear.
servo_rs485_connection check failed.NOTE: Validator results may take 15-30 minutes after the flight ends to appear.
Enter the mission identifier above to load failed maintenance validator results.
Did any servo_rs485_connection validator checks fail?
2 question
Are you troubleshooting an EV2 or EV3 aircraft?
3 question
Check the
Wing-forward values:
Roll/Tilt values:
Tail values:
Which servo value failed?
<servo> value in the failing validator result.Wing-forward values:
servo_wing_port_fwd, servo_wing_port_fwd_comms, servo_wing_stbd_fwd, or servo_wing_stbd_fwd_commsRoll/Tilt values:
servo_roll or servo_tiltTail values:
servo_tail_port_fwd or servo_tail_stbd_fwdWhich servo value failed?
4 question
Is this a commercial Zip or a test Zip?
5 question
Check the
Wing-forward values:
Roll, tilt, and tail values:
Which value matches the failing servo?
<servo> value in the failing validator result.Wing-forward values:
servo_wing_port_fwd, servo_wing_port_fwd_comms, servo_wing_stbd_fwd, or servo_wing_stbd_fwd_commsRoll, tilt, and tail values:
servo_roll, servo_tilt, servo_tail_port_fwd, or servo_tail_stbd_fwdWhich value matches the failing servo?
6 question
Does this asset have a previous instance of EV2 Test: Install M5 Bracket?
7 action
Based on the alarm, create work orders to swap the servo and flex harness on the affected side: Port FWD or STBD FWD.
Templates:
- Servo: #852: EV2 Replace Servo/Linkage Assembly on Aircraft Wing
- Port FWD flex harness: #1029: EV2 Replace Port FWD Hover Flex Harness on Aircraft
- STBD FWD flex harness: #1031: EV2 Replace STBD FWD Hover Flex Harness on Aircraft
Templates:
- Servo: #852: EV2 Replace Servo/Linkage Assembly on Aircraft Wing
- Port FWD flex harness: #1029: EV2 Replace Port FWD Hover Flex Harness on Aircraft
- STBD FWD flex harness: #1031: EV2 Replace STBD FWD Hover Flex Harness on Aircraft
8 action
Assign and install #1103: EV2 Test Install M5 Bracket.
Based on the alarm, create work orders to swap the servo and flex harness on the affected side: Port FWD or STBD FWD.
Templates:
- Servo: #852: EV2 Replace Servo/Linkage Assembly on Aircraft Wing
- Port FWD flex harness: #1029: EV2 Replace Port FWD Hover Flex Harness on Aircraft
- STBD FWD flex harness: #1031: EV2 Replace STBD FWD Hover Flex Harness on Aircraft
Based on the alarm, create work orders to swap the servo and flex harness on the affected side: Port FWD or STBD FWD.
Templates:
- Servo: #852: EV2 Replace Servo/Linkage Assembly on Aircraft Wing
- Port FWD flex harness: #1029: EV2 Replace Port FWD Hover Flex Harness on Aircraft
- STBD FWD flex harness: #1031: EV2 Replace STBD FWD Hover Flex Harness on Aircraft
9 action
Create a work order to swap the affected prepped hover harness.
Use the matching template for the affected side:
- STBD prepped hover harness: EV3: Replace Stbd Prepped Hover Harness on Aircraft
- Port prepped hover harness: EV3: Replace Port Prepped Hover Harness on Aircraft
Use the matching template for the affected side:
- STBD prepped hover harness: EV3: Replace Stbd Prepped Hover Harness on Aircraft
- Port prepped hover harness: EV3: Replace Port Prepped Hover Harness on Aircraft
10 actionquestion
Inspect the Hirose connector, servo wires, flex harness, and SAMTEC connector.
- Hirose connector: Ensure the connector is seated properly and not backing out. Follow guide: 20.2.5.a Inspect HIROSE Connection.
- Servo wires: Look for abrasion or damage. For steps, see UMM: 20.4.2.a Inspect Wire Harness.
- Flex harness: Look for abrasion or damage. Follow guide: 20.2.2.e Inspect Flex Harness.
- SAMTEC connector: Check whether the connector has the spring clip. Ensure it is seated properly and not backing out. Follow guide: 20.2.4.a Inspect SAMTEC Connectors.
Which item failed visual inspection?
- Hirose connector: Ensure the connector is seated properly and not backing out. Follow guide: 20.2.5.a Inspect HIROSE Connection.
- Servo wires: Look for abrasion or damage. For steps, see UMM: 20.4.2.a Inspect Wire Harness.
- Flex harness: Look for abrasion or damage. Follow guide: 20.2.2.e Inspect Flex Harness.
- SAMTEC connector: Check whether the connector has the spring clip. Ensure it is seated properly and not backing out. Follow guide: 20.2.4.a Inspect SAMTEC Connectors.
Which item failed visual inspection?
11 question
What issue did you find with the Hirose connector?
12 action
Plug in the Hirose connector. Confirm it is seated properly and not backing out.
13 action
Swap the servo or associated hardware. Inform P2 Avionics Hardware On Call and use the EV3 Zip Interface-Critical Components Ownership page to determine where to ship the hardware for analysis.
14 action
15 actionquestion
16 question
What issue did you find with the SAMTEC connector?
17 action
Install or reconnect the SAMTEC spring clip and properly seat the connector.
18 action
Swap the flex harness and ship the damaged hardware to Avionics for analysis.
19 question
Is there a completed instance of EV2 Ops: Tail/Tilt/Roll Servo and Flex Inspection in the last 100 flights?
Did that instance include AMA and tail node removal?
Did that instance include AMA and tail node removal?
20 question
Is there a completed instance of EV2 Ops: Tail/Tilt/Roll Servo and Flex Inspection in the last 100 flights?
Did that instance include AMA and tail node removal?
Did that instance include AMA and tail node removal?
21 actionquestion
Assign EV2 Ops: Tail/Tilt/Roll Servo and Flex Inspection to inspect the affected roll or tilt servo and flex harness.
Perform a Maintenance Check Flight after work completion.
Is the issue resolved?
Perform a Maintenance Check Flight after work completion.
Is the issue resolved?
22 actionquestion
Assign EV2 Ops: Tail/Tilt/Roll Servo and Flex Inspection to inspect the affected tail servo and flex harness.
Perform a Maintenance Check Flight after work completion.
Is the issue resolved?
Perform a Maintenance Check Flight after work completion.
Is the issue resolved?
23 question
Is there a previous instance of the following work order along with all completed steps #1038: ZCO-2026-06-11 M5 Connector Bracket Retrofit (FRCO-252 / SB-2026-020 / HIT-171) on this asset?
24 actionquestion
Assign EV2 Commercial Ops: Wing Servo and Flex Inspection for inspection and next steps.
Perform a Maintenance Check Flight after work completion.
Is the issue resolved?
Perform a Maintenance Check Flight after work completion.
Is the issue resolved?
25 actionquestion
Inspect the M5 connector, M5 Servo wire harness, and flex harness.
- M5 connector: Ensure the connector is tight and not backing out. Check that the torque stripe is aligned and the connector is seated properly.
- M5 Servo wire harness: Look for abrasion or damage. For steps, see UMM: Inspect Wire Harness.
- Flex harness: Look for abrasion or damage. Follow the guide here: EV2 Flex Harness Inspection.
Which item failed visual inspection?
- M5 connector: Ensure the connector is tight and not backing out. Check that the torque stripe is aligned and the connector is seated properly.
- M5 Servo wire harness: Look for abrasion or damage. For steps, see UMM: Inspect Wire Harness.
- Flex harness: Look for abrasion or damage. Follow the guide here: EV2 Flex Harness Inspection.
Which item failed visual inspection?
26 actionquestion
Tighten the M5 connector and re-apply the torque stripe. Perform a Maintenance Check Flight.
Is the issue resolved?
Is the issue resolved?
27 actionquestion
Inspect the remaining M5 Servo wire harness and flex harness.
- M5 Servo wire harness: Look for abrasion or damage. For steps, see UMM: Inspect Wire Harness.
- Flex harness: Look for abrasion or damage. Follow the guide here: EV2 Flex Harness Inspection.
Which item failed visual inspection?
- M5 Servo wire harness: Look for abrasion or damage. For steps, see UMM: Inspect Wire Harness.
- Flex harness: Look for abrasion or damage. Follow the guide here: EV2 Flex Harness Inspection.
Which item failed visual inspection?
28 actionquestion
Swap the servo and flex harness. Perform a Maintenance Check Flight.
Is the issue resolved?
Is the issue resolved?
29 actionquestion
30 action
31 actionquestion
Inspect the M5 connector, M5 Servo wire harness, and flex harness.
- M5 connector: Ensure the connector is tight and not backing out. Check that the torque stripe is aligned and the connector is seated properly.
- M5 Servo wire harness: Look for abrasion or damage. For steps, see UMM: Inspect Wire Harness.
- Flex harness: Look for abrasion or damage. Follow the guide here: EV2 Flex Harness Inspection.
Which item failed visual inspection?
- M5 connector: Ensure the connector is tight and not backing out. Check that the torque stripe is aligned and the connector is seated properly.
- M5 Servo wire harness: Look for abrasion or damage. For steps, see UMM: Inspect Wire Harness.
- Flex harness: Look for abrasion or damage. Follow the guide here: EV2 Flex Harness Inspection.
Which item failed visual inspection?
32 actionquestion
Tighten the M5 connector and re-apply the torque stripe. Perform a Maintenance Check Flight.
Is the issue resolved?
Is the issue resolved?
33 actionquestion
Inspect the remaining M5 Servo wire harness and flex harness.
- M5 Servo wire harness: Look for abrasion or damage. For steps, see UMM: Inspect Wire Harness.
- Flex harness: Look for abrasion or damage. Follow the guide here: EV2 Flex Harness Inspection.
Which item failed visual inspection?
- M5 Servo wire harness: Look for abrasion or damage. For steps, see UMM: Inspect Wire Harness.
- Flex harness: Look for abrasion or damage. Follow the guide here: EV2 Flex Harness Inspection.
Which item failed visual inspection?
34 actionquestion
Replace the LRU associated with the damaged harness. Perform a Maintenance Check Flight.
Is the issue resolved?
Is the issue resolved?
35 actionquestion
Swap the flex harness. Perform a Maintenance Check Flight.
Is the issue resolved?
Is the issue resolved?
36 actionquestion
37 escalation
Escalate to P2 Avionics Hardware On Call.
38 reference
The Aircraft may return to service.
39 escalation
Escalate to P2 Avionics Hardware On Call.
40 escalation
Escalate to P2 Firmware Platform On Call.
Resolution note
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