Rotable Spare Parts Inventory — Capitalisation
Recording the purchase of high-value rotable aircraft parts held as spare inventory.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Rotable Spare Parts (PPE / Inventory) | Asset (+) | 15,000,000.00 | - |
| Cash / Accounts Payable (Parts Supplier) | Asset/Liability (-) | - | 15,000,000.00 |
💡 Accountant's Note
Rotable parts are expensive, repairable aircraft components (avionics, actuators, landing gear components) that are repaired and reused rather than scrapped. They are classified as PPE (if dedicated to a specific aircraft) or inventory (if held in a pool for multiple aircraft). High-value rotables are depreciated over their useful life; low-value expendable parts are expensed on consumption.
Practitioner & Systems Framework
💻 ERP Architecture
Rotable spare parts are tracked in the material management module of the MRO system (AMOS, TRAX). Each rotable has a part number and serial number. The value accounting depends on classification: parts dedicated to a specific aircraft are PPE (depreciated); pooled spare parts available for any aircraft are inventory (carried at cost/NRV). When a rotable is removed from an aircraft for repair and replaced with a serviceable unit, the accounting involves: (1) removing the unserviceable part from the aircraft, (2) recording the serviceable replacement as an asset reduction, and (3) accruing the repair cost when the unserviceable unit returns from the MRO shop.
⚠️ Audit Flags
Auditors perform physical counts of rotable spare parts in the stores and confirm against the MRO system's stock records. Test the PPE vs. inventory classification — components dedicated to one aircraft are PPE; components used across the fleet are inventory. Confirm NRV testing for rotable inventory — parts for aircraft types being retired may have limited future value. Test that the repair cycle (remove, repair, reinstall) is correctly accounted for, with the repair cost either capitalised (if the repair restores capability beyond original) or expensed (if routine restoration).
📄 Required Documentation
Rotable spare parts inventory listing (part number, serial number, quantity, value), physical count and reconciliation, PPE vs. inventory classification policy, NRV assessment for fleet retirement parts, repair cost accounting treatment (capitalise vs. expense), MRO system stock record, and airworthiness certification for used rotables.
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