SERVO_*_CALIBRATION: TIMED_OUT
Viewing this guide for
Applicable alarms (7)
SERVO_WING_PORT_FWD_CALIBRATION: TIMED_OUTSERVO_WING_STBD_FWD_CALIBRATION: TIMED_OUTSERVO_TAIL_PORT_FWD_CALIBRATION: TIMED_OUTSERVO_TAIL_STBD_FWD_CALIBRATION: TIMED_OUTSERVO_ROLL_CALIBRATION: TIMED_OUTSERVO_TILT_CALIBRATION: TIMED_OUTZIP_EXECUTIVE_V4_TEST_TIMED_OUT
Likely outcomes — click to expand
Based on 0 missions where this alarm fired in the last
90 days
(for SERVO_WING_PORT_FWD_CALIBRATION: TIMED_OUT) as of 2026-10-13
Aggregated from fleet operations and refreshed daily. Individual outcomes may vary by site and configuration.
These troubleshooting steps are applicable to the following alarms:
- SERVO_WING_PORT_FWD_CALIBRATION: TIMED_OUT
- SERVO_WING_STBD_FWD_CALIBRATION: TIMED_OUT
- SERVO_TAIL_PORT_FWD_CALIBRATION: TIMED_OUT
- SERVO_TAIL_STBD_FWD_CALIBRATION: TIMED_OUT
- SERVO_ROLL_CALIBRATION: TIMED_OUT
- SERVO_TILT_CALIBRATION: TIMED_OUT
Background
Section titled “Background”This alarm usually occurs due to a comms drop out between the Ethernet link of the failed servo or power issues. If comms are the issue the failure will most likely be paired with MOTOR_CONTROL_UNAVAILABLE or MOTOR_CONTROL_UNINITIALIZED alarm.
Troubleshooting Steps
Section titled “Troubleshooting Steps”graph TD
can-the-issue-be-reproduced-in-diagnost{"<small><b>Step 1</b></small><br/>Question: Can the issue be reproduced in Diagno..."}
are-any-other-alarms-present{"<small><b>Step 2</b></small><br/>Question: Are any other alarms present?"}
follow-the-relevant-troubleshooting-topi("<small><b>Step 3</b></small><br/>Reference: Follow the relevant troubleshooting t...")
follow-the-steps-below-that-relate-to-t{"<small><b>Step 4</b></small><br/>Question: Follow the steps below that relate to..."}
inspect-the-tail-bridge-board-see-umm-8["<small><b>Step 5</b></small><br/>Action: Inspect the tail bridge board. See UM..."]
are-the-servo-and-m5-connections-seated{"<small><b>Step 6</b></small><br/>Question: Are the servo and m5 connections seat..."}
reseat-the-m5-connector-tail["<small><b>Step 7</b></small><br/>Action: Reseat the M5 connector"]
run-the-motor-calibration-test-in-diagno{"<small><b>Step 8</b></small><br/>Question: Run the Motor calibration test in dia..."}
the-aircraft-may-return-to-service-tail("<small><b>Step 9</b></small><br/>Reference: The Aircraft may return to service.")
inspect-the-outboard-wing-see-umm-57-2["<small><b>Step 10</b></small><br/>Action: Inspect the outboard wing. See UMM: ..."]
are-the-servo-and-m5-connections-seated-2{"<small><b>Step 11</b></small><br/>Question: Are the servo and m5 connections seat..."}
reseat-the-m5-connector-wing["<small><b>Step 12</b></small><br/>Action: Reseat the M5 connector"]
run-the-motor-calibration-test-in-diagno-2{"<small><b>Step 13</b></small><br/>Question: Run the Motor calibration test in dia..."}
the-aircraft-may-return-to-service-wing("<small><b>Step 14</b></small><br/>Reference: The Aircraft may return to service.")
perform-a-zip-maintenance-health-check-i{"<small><b>Step 15</b></small><br/>Question: Perform a Zip maintenance health chec..."}
the-aircraft-may-return-to-service-healt("<small><b>Step 16</b></small><br/>Reference: The Aircraft may return to service.")
escalate-to-aircraft-structures-and-mech{{"<small><b>Step 17</b></small><br/>Escalation: Escalate to Aircraft Structures & Mec..."}}
can-the-issue-be-reproduced-in-diagnost -->|Yes| follow-the-steps-below-that-relate-to-t
can-the-issue-be-reproduced-in-diagnost -->|No| are-any-other-alarms-present
are-any-other-alarms-present -->|Yes| follow-the-relevant-troubleshooting-topi
are-any-other-alarms-present -->|No| follow-the-steps-below-that-relate-to-t
follow-the-steps-below-that-relate-to-t -->|Tail, Tilt, or Roll Servo| inspect-the-tail-bridge-board-see-umm-8
follow-the-steps-below-that-relate-to-t -->|Wing Servo| inspect-the-outboard-wing-see-umm-57-2
inspect-the-tail-bridge-board-see-umm-8 --> are-the-servo-and-m5-connections-seated
are-the-servo-and-m5-connections-seated -->|Yes| perform-a-zip-maintenance-health-check-i
are-the-servo-and-m5-connections-seated -->|No| reseat-the-m5-connector-tail
reseat-the-m5-connector-tail --> run-the-motor-calibration-test-in-diagno
run-the-motor-calibration-test-in-diagno -->|YES| the-aircraft-may-return-to-service-tail
run-the-motor-calibration-test-in-diagno -->|NO| perform-a-zip-maintenance-health-check-i
inspect-the-outboard-wing-see-umm-57-2 --> are-the-servo-and-m5-connections-seated-2
are-the-servo-and-m5-connections-seated-2 -->|Yes| perform-a-zip-maintenance-health-check-i
are-the-servo-and-m5-connections-seated-2 -->|No| reseat-the-m5-connector-wing
reseat-the-m5-connector-wing --> run-the-motor-calibration-test-in-diagno-2
run-the-motor-calibration-test-in-diagno-2 -->|YES| the-aircraft-may-return-to-service-wing
run-the-motor-calibration-test-in-diagno-2 -->|NO| perform-a-zip-maintenance-health-check-i
perform-a-zip-maintenance-health-check-i -->|Yes| the-aircraft-may-return-to-service-healt
perform-a-zip-maintenance-health-check-i -->|No| escalate-to-aircraft-structures-and-mech
style can-the-issue-be-reproduced-in-diagnost fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style are-any-other-alarms-present fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style follow-the-relevant-troubleshooting-topi fill:#f3e8ff,stroke:#a855f7,color:#581c87
style follow-the-steps-below-that-relate-to-t fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style inspect-the-tail-bridge-board-see-umm-8 fill:#dcfce7,stroke:#22c55e,color:#14532d
style are-the-servo-and-m5-connections-seated fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style reseat-the-m5-connector-tail fill:#dcfce7,stroke:#22c55e,color:#14532d
style run-the-motor-calibration-test-in-diagno fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style the-aircraft-may-return-to-service-tail fill:#f3e8ff,stroke:#a855f7,color:#581c87
style inspect-the-outboard-wing-see-umm-57-2 fill:#dcfce7,stroke:#22c55e,color:#14532d
style are-the-servo-and-m5-connections-seated-2 fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style reseat-the-m5-connector-wing fill:#dcfce7,stroke:#22c55e,color:#14532d
style run-the-motor-calibration-test-in-diagno-2 fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style the-aircraft-may-return-to-service-wing fill:#f3e8ff,stroke:#a855f7,color:#581c87
style perform-a-zip-maintenance-health-check-i fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style the-aircraft-may-return-to-service-healt fill:#f3e8ff,stroke:#a855f7,color:#581c87
style escalate-to-aircraft-structures-and-mech fill:#fef3c7,stroke:#f59e0b,color:#78350f Hover or focus a block to preview it. Select the block to keep the preview open.
1 question
Can the issue be reproduced in Diagnostic Mode?
2 question
Are any other alarms present?
3 reference
Follow the relevant troubleshooting topic for the alarm(s).
4 question
Follow the steps below that relate to the issue.
5 action
Inspect the tail bridge board. See UMM: 85.1.3.a Inspect Tail - General.
6 question
Are the servo and m5 connections seated correctly?
7 action
Reseat the M5 connector
8 question
Run the Motor calibration test in diagnostics mode. Did the test pass?
9 reference
The Aircraft may return to service.
10 action
Inspect the outboard wing. See UMM: 57.2.2.b Inspect Outboard Wing - General. Inspect the connections at the fwd hover motor on the relevant side.
11 question
Are the servo and m5 connections seated correctly?
12 action
Reseat the M5 connector
13 question
Run the Motor calibration test in diagnostics mode. Did the test pass?
14 reference
The Aircraft may return to service.
15 question
Perform a Zip maintenance health check. Is the issue resolved?
16 reference
The Aircraft may return to service.
17 escalation
Escalate to Aircraft Structures & Mechanisms On Call.
Resolution note
This plaintext block is ready to paste into the Resolution Note field on the ZERP issue you're working. The permalink below gives engineering review access to the full step-by-step timeline including any back-navigation; share it if the case needs a deeper look.
Permalink:
Session is too large to fit in a URL. Use Download session JSON to share the timeline out-of-band.
Did this guide help you get unblocked?
Open suggestions
There are no open suggestions.
Open pull requests
There are no open pull requests.