Validator: winch/winding_temperature
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Applicable to all software versions.
Background
Section titled “Background”This critical maintenance validator indicates abnormal winch winding temperature which should correspond to hardware damage. However, historically the thresholds to fail this validator have been too conservative, causing unnecessary false positives.
Applicable Validator Checks
winch/winding_temperature_abwinch/winding_temperature_acwinch/winding_temperature_bc
Troubleshooting Steps
Section titled “Troubleshooting Steps”graph TD
check-the-winding-temperatures{"<small><b>Step 1</b></small><br/>Question: Verify the winding temperatures for e..."}
the-aircraft-may-return-to-service["<small><b>Step 2</b></small><br/>Action: The Aircraft may return to service wi..."]
replace-the-winch["<small><b>Step 3</b></small><br/>Action: Replace the winch. **WORK ORDER TEMPL..."]
perform-a-lowerdroid-and-raisedroid-mi{"<small><b>Step 4</b></small><br/>Question: Perform a LowerDroid and RaiseDroid m..."}
escalate-to-p2-firmware-motors{{"<small><b>Step 5</b></small><br/>Escalation: Escalate to P2 Firmware Motors On Call."}}
follow-the-appropriate-guide-to-conti["<small><b>Step 6</b></small><br/>Action: Follow the appropriate troubleshootin..."]
the-aircraft-may-return-to-service-after-verification["<small><b>Step 7</b></small><br/>Action: The Aircraft may return to service."]
check-the-winding-temperatures -->|At least one of the winding...| replace-the-winch
check-the-winding-temperatures -->|All of the winding temperat...| the-aircraft-may-return-to-service
replace-the-winch --> perform-a-lowerdroid-and-raisedroid-mi
perform-a-lowerdroid-and-raisedroid-mi -->|Yes| escalate-to-p2-firmware-motors
perform-a-lowerdroid-and-raisedroid-mi -->|No, but there are other ala...| follow-the-appropriate-guide-to-conti
perform-a-lowerdroid-and-raisedroid-mi -->|No, and there are no other ...| the-aircraft-may-return-to-service-after-verification
style check-the-winding-temperatures fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style the-aircraft-may-return-to-service fill:#dcfce7,stroke:#22c55e,color:#14532d
style replace-the-winch fill:#dcfce7,stroke:#22c55e,color:#14532d
style perform-a-lowerdroid-and-raisedroid-mi fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style escalate-to-p2-firmware-motors fill:#fef3c7,stroke:#f59e0b,color:#78350f
style follow-the-appropriate-guide-to-conti fill:#dcfce7,stroke:#22c55e,color:#14532d
style the-aircraft-may-return-to-service-after-verification fill:#dcfce7,stroke:#22c55e,color:#14532d Hover or focus a block to preview it. Select the block to keep the preview open.
1 question
Verify the winding temperatures for each failing check using the middle plot on the
Are the failing windings hotter than 210C?
Example of the template view showing a maximum temperature of 165C on the hottest winding (BC).
WINCH OVERTEMPERATURE - Check for phase imbalance template. If you can't see the whole mission in zip view, add 400 seconds of padding before the default start time.Are the failing windings hotter than 210C?
Example of the template view showing a maximum temperature of 165C on the hottest winding (BC).
2 action
The Aircraft may return to service with no further action. This is a false positive due to excessively conservative thresholds.
3 action
Replace the winch.
WORK ORDER TEMPLATE: Use the work order template that matches the hardware version:
- Work Order Template #70 - EV2: Replace Winch on Aircraft Docking Fin/Winch Assembly
- Work Order Template #1067 - EV3: Replace Winch on Aircraft Docking Fin Winch LRU
WORK ORDER TEMPLATE: Use the work order template that matches the hardware version:
- Work Order Template #70 - EV2: Replace Winch on Aircraft Docking Fin/Winch Assembly
- Work Order Template #1067 - EV3: Replace Winch on Aircraft Docking Fin Winch LRU
4 question
Perform a LowerDroid and RaiseDroid mission and wait for the validators to run. Is the validator failure persisting after winch replacement?
5 escalation
Escalate to P2 Firmware Motors On Call.
6 action
Follow the appropriate troubleshooting guide to continue triaging.
7 action
The Aircraft may return to service.
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