BLOWER_MOTOR_FAILURE
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Applicable alarms (1)
BLOWER_MOTOR_FAILURE
Likely outcomes — click to expand
Based on 425 missions where this alarm fired in the last 90 days as of 2026-10-13
Grounding vs discrepancy (of 12 ZERP issues filed on these missions)
Frequently replaced parts
| Part | P/N | Removals |
|---|---|---|
| FLIGHT COMPUTER ASSY, ZIP, P2 | 20994 | 24 |
| ASSY, SPOOL AND LINE, DOCKING FIN, AIRCRAFT, P2 | 48477 | 4 |
Frequently co-occurring alarms (% of the 425 missions above)
Aggregated from fleet operations and refreshed daily. Individual outcomes may vary by site and configuration.
Background
Section titled “Background”This alarm is published by the blower motor driver, this driver is responsible for controlling the motor that cools the NVIDIA Orin SOM. The blower motor is plugged into the compute board.
BLOWER_MOTOR_FAILURE means that the driver is unable to effectively commutate the motor. This can mean that there is a hardware issue.
Troubleshooting Steps
Section titled “Troubleshooting Steps”graph TD
is-this-the-first-time-this-alarm-has-o{"<small><b>Step 1</b></small><br/>Question: Is this the first time this alarm has..."}
power-cycle-the-aircraft-power-cycle-ai["<small><b>Step 2</b></small><br/>Action: Power cycle the aircraft: Power Cycl..."]
perform-preflight["<small><b>Step 3</b></small><br/>Action: Perform preflight."]
is-this-issue-resolved{"<small><b>Step 4</b></small><br/>Question: Is this issue resolved?"}
aircraft-can-return-to-service["<small><b>Step 5</b></small><br/>Action: Aircraft can return to service"]
inspect-the-compute-board-for-steps-see-2["<small><b>Step 6</b></small><br/>Action: Inspect the compute board. For steps,..."]
was-any-damage-found-on-the-compute-a-b{"<small><b>Step 7</b></small><br/>Question: Was any damage found on the compute A..."}
replace-the-board-for-steps-see["<small><b>Step 8</b></small><br/>Action: Assign WO 27 - EV2: Replace Flight C..."]
escalate-to-p2-avionics-hardware-on-cal{{"<small><b>Step 9</b></small><br/>Escalation: Escalate to P2 Avionics Hardware On C..."}}
inspect-the-compute-board-for-steps-see["<small><b>Step 10</b></small><br/>Action: Inspect the compute board. For steps,..."]
was-any-damage-found-on-the-compute-a-b-2{"<small><b>Step 11</b></small><br/>Question: Was any damage found on the compute A..."}
replace-the-compute-board-for-steps-see["<small><b>Step 12</b></small><br/>Action: Assign WO 27 - EV2: Replace Flight C..."]
escalate-to-p2-avionics-hardware-on-cal-2{{"<small><b>Step 13</b></small><br/>Escalation: Escalate to P2 Avionics Hardware On C..."}}
is-this-the-first-time-this-alarm-has-o -->|Yes| power-cycle-the-aircraft-power-cycle-ai
is-this-the-first-time-this-alarm-has-o -->|No| inspect-the-compute-board-for-steps-see
power-cycle-the-aircraft-power-cycle-ai --> perform-preflight
perform-preflight --> is-this-issue-resolved
is-this-issue-resolved -->|Yes| aircraft-can-return-to-service
is-this-issue-resolved -->|No| inspect-the-compute-board-for-steps-see-2
inspect-the-compute-board-for-steps-see-2 --> was-any-damage-found-on-the-compute-a-b
was-any-damage-found-on-the-compute-a-b -->|Yes| replace-the-board-for-steps-see
was-any-damage-found-on-the-compute-a-b -->|No| escalate-to-p2-avionics-hardware-on-cal
inspect-the-compute-board-for-steps-see --> was-any-damage-found-on-the-compute-a-b-2
was-any-damage-found-on-the-compute-a-b-2 -->|Yes| replace-the-compute-board-for-steps-see
was-any-damage-found-on-the-compute-a-b-2 -->|No| escalate-to-p2-avionics-hardware-on-cal-2
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style perform-preflight fill:#dcfce7,stroke:#22c55e,color:#14532d
style is-this-issue-resolved fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style aircraft-can-return-to-service fill:#dcfce7,stroke:#22c55e,color:#14532d
style inspect-the-compute-board-for-steps-see-2 fill:#dcfce7,stroke:#22c55e,color:#14532d
style was-any-damage-found-on-the-compute-a-b fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style replace-the-board-for-steps-see fill:#dcfce7,stroke:#22c55e,color:#14532d
style escalate-to-p2-avionics-hardware-on-cal fill:#fef3c7,stroke:#f59e0b,color:#78350f
style inspect-the-compute-board-for-steps-see fill:#dcfce7,stroke:#22c55e,color:#14532d
style was-any-damage-found-on-the-compute-a-b-2 fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style replace-the-compute-board-for-steps-see fill:#dcfce7,stroke:#22c55e,color:#14532d
style escalate-to-p2-avionics-hardware-on-cal-2 fill:#fef3c7,stroke:#f59e0b,color:#78350f Hover or focus a block to preview it. Select the block to keep the preview open.
1 question
Is this the first time this alarm has occurred?
2 action
Power cycle the aircraft: Power Cycle Aircraft.
3 action
Perform preflight.
4 question
Is this issue resolved?
5 action
Aircraft can return to service
6 action
Inspect the compute board. For steps, see UMM: Inspect Flight Compute Assembly (FCA).
7 question
Was any damage found on the compute A blower assembly, and/or any other area of the compute board?
9 escalation
Escalate to P2 Avionics Hardware On Call.
10 action
Inspect the compute board. For steps, see UMM: Inspect Flight Compute Assembly.
11 question
Was any damage found on the compute A blower assembly, and/or any other area of the compute board?
13 escalation
Escalate to P2 Avionics Hardware On Call.
Resolution note
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Example ZipMissionLog
Section titled “Example ZipMissionLog”{ "status": "ZIP_MISSION_STATUS_ENDED_IN_FAILURE", "asset_id": "p2-zip-371", "dock_ids": [ "p2-dock-84" ], "droid_id": "p2-droid-499", "timestamp": "2025-05-07T19:41:43.781Z", "flight_ids": [ "P2F_65AB1116D7C1594C" ], "mission_id": "P2M_65AB11142DC00000", "ibit_status": [], "capabilities": { "can_dock": "CAPABILITY_STATUS_DISABLED", "can_avoid": "CAPABILITY_STATUS_UNSPECIFIED", "can_hover": "CAPABILITY_STATUS_AVAILABLE", "can_cruise": "CAPABILITY_STATUS_AVAILABLE", "can_launch": "CAPABILITY_STATUS_FAILED", "can_deliver": "CAPABILITY_STATUS_DISABLED", "can_transit": "CAPABILITY_STATUS_AVAILABLE", "has_package": "CAPABILITY_STATUS_DISABLED", "can_failover": "CAPABILITY_STATUS_UNSPECIFIED", "can_paraland": "CAPABILITY_STATUS_DISABLED", "is_on_ground": "CAPABILITY_STATUS_DISABLED", "are_motors_off": "CAPABILITY_STATUS_AVAILABLE", "can_deconflict": "CAPABILITY_STATUS_UNSPECIFIED", "can_spin_motors": "CAPABILITY_STATUS_DISABLED", "is_droid_stowed": "CAPABILITY_STATUS_DISABLED", "can_perform_ibit": "CAPABILITY_STATUS_AVAILABLE", "can_control_droid": "CAPABILITY_STATUS_AVAILABLE", "can_control_winch": "CAPABILITY_STATUS_UNSPECIFIED", "is_droid_lid_open": "CAPABILITY_STATUS_DISABLED", "is_compute_healthy": "CAPABILITY_STATUS_UNSPECIFIED", "is_crossfire_alive": "CAPABILITY_STATUS_DISABLED", "is_droid_in_portal": "CAPABILITY_STATUS_AVAILABLE", "can_gnc_spin_motors": "CAPABILITY_STATUS_DISABLED", "is_in_dock_corridor": "CAPABILITY_STATUS_DISABLED", "is_retained_on_dock": "CAPABILITY_STATUS_AVAILABLE", "has_passed_all_ibits": "CAPABILITY_STATUS_DISABLED", "is_retracted_on_dock": "CAPABILITY_STATUS_AVAILABLE", "is_transit_completed": "CAPABILITY_STATUS_DISABLED", "can_transit_nominally": "CAPABILITY_STATUS_UNSPECIFIED", "is_cut_line_completed": "CAPABILITY_STATUS_UNSPECIFIED", "is_delivery_completed": "CAPABILITY_STATUS_DISABLED", "is_take_off_completed": "CAPABILITY_STATUS_DISABLED", "can_transit_with_droid": "CAPABILITY_STATUS_UNSPECIFIED", "is_call_home_completed": "CAPABILITY_STATUS_UNSPECIFIED", "can_reach_mission_goals": "CAPABILITY_STATUS_AVAILABLE", "is_dock_motion_completed": "CAPABILITY_STATUS_DISABLED", "is_lower_droid_completed": "CAPABILITY_STATUS_DISABLED", "is_raise_droid_completed": "CAPABILITY_STATUS_DISABLED", "can_droid_lower_to_portal": "CAPABILITY_STATUS_DISABLED", "are_diagnostic_ibits_reset": "CAPABILITY_STATUS_DISABLED", "can_droid_raise_from_portal": "CAPABILITY_STATUS_AVAILABLE", "can_receive_delivery_mission": "CAPABILITY_STATUS_AVAILABLE", "has_received_pending_mission": "CAPABILITY_STATUS_DISABLED", "is_take_off_time_window_open": "CAPABILITY_STATUS_AVAILABLE", "can_droid_execute_motion_cmds": "CAPABILITY_STATUS_UNSPECIFIED", "has_received_delivery_mission": "CAPABILITY_STATUS_DISABLED", "is_crossfire_disarm_requested": "CAPABILITY_STATUS_DISABLED", "is_diagnostic_abort_requested": "CAPABILITY_STATUS_DISABLED", "is_performing_partial_takeoff": "CAPABILITY_STATUS_DISABLED", "are_diagnostic_ibits_completed": "CAPABILITY_STATUS_DISABLED", "can_receive_reposition_mission": "CAPABILITY_STATUS_AVAILABLE", "is_software_download_completed": "CAPABILITY_STATUS_DISABLED", "has_received_reposition_mission": "CAPABILITY_STATUS_DISABLED", "is_crossfire_gnc_mode_requested": "CAPABILITY_STATUS_DISABLED", "is_crossfire_paraland_requested": "CAPABILITY_STATUS_DISABLED", "is_delivery_hydration_completed": "CAPABILITY_STATUS_DISABLED", "can_communicate_with_remote_pilot": "CAPABILITY_STATUS_AVAILABLE", "is_winch_emergency_hold_completed": "CAPABILITY_STATUS_UNSPECIFIED", "is_emergency_lower_droid_completed": "CAPABILITY_STATUS_UNSPECIFIED" }, "failure_summaries": [ "gps_timestamp": 1746042167544960000, "error_report": { "primary_unique_error_id": "ERR_123456", "errors": { "ERR_123456": { "code": 0x00010005, "message": "CanLaunch failed", "gps_timestamp": 173651165380000000, "unix_timestamp": 1024658498.45, "unique_id": "ERR_123456", "related_alarm_summaries": [{ "relation_type": RelationType::CAUSED_BY, "alarm": { "alarm_id": 4, "identifier": "/compute_a.som_blower.status", "name": "BLOWER_MOTOR_FAILURE", "alarm_namespace": "alarms", } }] } } }, "executive_task": "RunPreliminaryChecks", "flight_id": "P2F_65AB1116D7C1594C", "droid_status": { "lid_open": false, "behaviors": [], "motion_state": "", "battery_status": { "pack_current": 1.2839198, "pack_voltage": 19.84253, "state_of_charge": 0.7585616, "unsafe_to_charge": false, "unsafe_to_deploy": false, "unsafe_to_operate": false, "ms_since_relaxation": "182098", "requires_maintenance": false }, "capability_map": {}, "droid_asset_id": "p2-droid-499", "is_finger_safe": false, "current_executive_id": { "step_id": "1", "task_id": "8", "mission_id": "P2M_1AA5EDA994800000", "sequence_id": "15475" }, "safety_system_status": "DROID_SAFETY_SYSTEM_STATUS_NOT_READY", "current_command_status": "DROID_COMMAND_STATUS_COMPLETED", "current_command_string": "Portal (\"LOWER_TO_PORTAL\")", "message_injection_state": { "metadata": "", "is_running": false, "config_path": "" }, "droid_parachute_deploy_reason": "DROID_PARACHUTE_DEPLOY_UNSPECIFIED" }, "flight_status": "FLIGHT_STATUS_FAILED", "winch_cutter_state": "WINCH_CUTTER_STATE_UNARMED", "active_alarms": [ { "identifier": "/tail_bridge.comm_status", "alarm_summaries": [ { "name": "RS485_SERVO_TAIL_STBD_FWD_SIGNAL_QUALITY_OFF_NOMINAL", "alarm_id": 0, "severity": "ALARM_INFO", "report_id": "", "visibility": "DEVELOPMENT", "alarm_namespace": "off_nominals" }, { "name": "RS485_SERVO_TAIL_PORT_FWD_SIGNAL_QUALITY_OFF_NOMINAL", "alarm_id": 1, "severity": "ALARM_INFO", "report_id": "", "visibility": "DEVELOPMENT", "alarm_namespace": "off_nominals" }, { "name": "RS485_SERVO_ROLL_SIGNAL_QUALITY_OFF_NOMINAL", "alarm_id": 2, "severity": "ALARM_INFO", "report_id": "", "visibility": "DEVELOPMENT", "alarm_namespace": "off_nominals" }, { "name": "RS485_SERVO_TILT_SIGNAL_QUALITY_OFF_NOMINAL", "alarm_id": 3, "severity": "ALARM_INFO", "report_id": "", "visibility": "DEVELOPMENT", "alarm_namespace": "off_nominals" }, { "name": "RS485_SERVO_TAIL_STBD_FWD_LINK_FAULT", "alarm_id": 0, "severity": "ALARM_INFO", "report_id": "", "visibility": "DEVELOPMENT", "alarm_namespace": "alarms" }, { "name": "RS485_SERVO_TAIL_PORT_FWD_LINK_FAULT", "alarm_id": 1, "severity": "ALARM_INFO", "report_id": "", "visibility": "DEVELOPMENT", "alarm_namespace": "alarms" }, { "name": "RS485_SERVO_ROLL_LINK_FAULT", "alarm_id": 2, "severity": "ALARM_INFO", "report_id": "", "visibility": "DEVELOPMENT", "alarm_namespace": "alarms" }, { "name": "RS485_SERVO_TILT_LINK_FAULT", "alarm_id": 3, "severity": "ALARM_INFO", "report_id": "", "visibility": "DEVELOPMENT", "alarm_namespace": "alarms" } ] }, { "identifier": "zip_executive.executive_status", "alarm_summaries": [ { "name": "ZIP_MOTOR_CONTROL_UNINITIALIZED", "alarm_id": 18, "severity": "ALARM_WARNING", "report_id": "", "visibility": "MAINTENANCE", "alarm_namespace": "alarms" } ] }, { "identifier": "mic_array_summary", "alarm_summaries": [ { "name": "ACOUSTIC_PROBES_DEGRADED", "alarm_id": 0, "severity": "ALARM_INFO", "report_id": "", "visibility": "DEVELOPMENT", "alarm_namespace": "alarms" } ] }, { "identifier": "service_health_monitor.health", "alarm_summaries": [ { "name": "SERVICE_RESTARTED", "alarm_id": 0, "severity": "ALARM_INFO", "report_id": "p2-zip-371-service_health_monitor.alarm_report-1746646143.29986-0", "visibility": "DEVELOPMENT", "alarm_namespace": "alarms" }, { "name": "SERVICE_NOT_ACTIVE", "alarm_id": 1, "severity": "ALARM_INFO", "report_id": "p2-zip-371-service_health_monitor.alarm_report-1746643615.5932901-1", "visibility": "DEVELOPMENT", "alarm_namespace": "alarms" } ] } ], "occupied_bay_ids": [ "bay_8550db1c-76d5-46b4-bea8-47fec5924a0b" ], "proto_build_info": { "winch": { "app": { "git_sha": "d9d5887fdf9c6947aa861274e3421b349976915e", "has_uncommitted_changes": true }, "boot": { "git_sha": "bbb73bacd0e169086df33ac252b119556d265b8e", "has_uncommitted_changes": false } }, "distro_a": { "app": { "git_sha": "d9d5887fdf9c6947aa861274e3421b349976915e", "has_uncommitted_changes": true }, "boot": { "git_sha": "bbb73bacd0e169086df33ac252b119556d265b8e", "has_uncommitted_changes": false } }, "distro_b": { "app": { "git_sha": "d9d5887fdf9c6947aa861274e3421b349976915e", "has_uncommitted_changes": true }, "boot": { "git_sha": "bbb73bacd0e169086df33ac252b119556d265b8e", "has_uncommitted_changes": false } }, "zip_linux_sha": "3e736e17027ed2bd2917470568247e3f2a0aae7e", "flight_systems_sha": "d9d5887fdf9c6947aa861274e3421b349976915e", "compute_b_zip_linux_sha": "3e736e17027ed2bd2917470568247e3f2a0aae7e", "compute_b_flight_systems_sha": "d9d5887fdf9c6947aa861274e3421b349976915e" }, "software_config_status": { "config_state": "CONFIG_STATE_UNSPECIFIED", "release_name": "fsw-2025.15.rc15", "configuration_id": "46d69824-fd0d-4d49-8364-f43133e66776" }, "message_injection_state": { "is_running": false }, "parachute_deploy_reason": "PARACHUTE_DEPLOY_UNSPECIFIED", "winch_cutter_deploy_reason": "WINCH_CUT_UNSPECIFIED", "droid_parachute_deploy_reason": "DROID_PARACHUTE_DEPLOY_UNSPECIFIED", "mission_status_unix_timestamps": { "ZIP_MISSION_STATUS_FAILED": 1746646903.53002, "ZIP_MISSION_STATUS_ACCEPTED": 1746646883.17058, "ZIP_MISSION_STATUS_ENDED_IN_FAILURE": 1746646903.53017 }}Did this guide help you get unblocked?
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