Heavy Maintenance Visit (C-Check / D-Check) — Capitalised
Capitalizing the cost of a scheduled heavy maintenance check on an owned aircraft.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Aircraft — Maintenance Component (Capitalised) | Asset (+) | 8,500,000.00 | - |
| Cash / Accounts Payable (MRO) | Asset/Liability (-) | - | 8,500,000.00 |
💡 Accountant's Note
Heavy maintenance checks (C-checks every 18-24 months, D-checks every 8-12 years) are capitalised under IAS 16's component approach. The maintenance event replaces the old maintenance interval component (derecognised at its NBV) and creates a new asset representing the next interval of maintenance activity. This is distinct from routine maintenance, which is expensed.
Practitioner & Systems Framework
💻 ERP Architecture
The heavy maintenance event cost is tracked in the MRO management system (AMOS, TRAX) by work order. On completion of the check, the MRO invoices are capitalised in the fixed asset module as a new maintenance component for each aircraft. The old component (if not already fully depreciated) is derecognised — its NBV is written off as a replacement cost. The new component is depreciated over the next maintenance interval (24 months for a C-check, 8-10 years for a D-check). For leased aircraft, heavy maintenance may be funded by the maintenance reserve deposits drawn from the lessor.
⚠️ Audit Flags
Auditors test the capitalisation threshold — minor repairs and routine servicing must be expensed; only major overhauls that restore the aircraft's performance beyond its original specification or extend its useful life are capitalised. Test that the old component is derecognised at the time the new component is capitalised. Confirm the new depreciation period is appropriate (next maintenance interval). Review the MRO invoice for any expense items (consumables, labour not related to the heavy check) that should not be capitalised.
📄 Required Documentation
MRO work order and final invoice, component derecognition and write-off record, capitalisation policy for maintenance events, new component depreciation schedule (interval-based), maintenance reserve drawback confirmation (for leased aircraft), and aircraft technical log confirming completion of the heavy check.
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