Aircraft Depreciation — Component Method
Monthly depreciation of an owned aircraft across its major components.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Depreciation — Aircraft Airframe | Expense (+) | 500,000.00 | - |
| Depreciation — Aircraft Engines | Expense (+) | 200,000.00 | - |
| Depreciation — Cabin Interior | Expense (+) | 80,000.00 | - |
| Accumulated Depreciation — Aircraft | Contra-Asset (+) | - | 780,000.00 |
💡 Accountant's Note
Under IAS 16's component method, each significant part of the aircraft with a different useful life is depreciated separately. The airframe (longest life), engines (medium life — often measured by flight cycles or hours), and cabin interior (shortest life — typically replaced mid-life) are the primary components. This matching of depreciation to actual usage and replacement cycles is the defining feature of airline PPE accounting.
Practitioner & Systems Framework
💻 ERP Architecture
Component depreciation is configured in the fixed asset module with separate asset IDs for each component of each aircraft. The depreciation method differs by component: straight-line for airframes and cabins (time-based); units-of-production for engines and LLPs (life-limited parts) where depreciation is based on flight cycles or hours flown. The fleet management system (AMOS/TRAX) tracks engine cycles and hours, feeding the depreciation system with actual utilisation data monthly. Aircraft with high utilisation depreciate faster under the cycle-based method — this aligns the depreciation charge with actual consumption.
⚠️ Audit Flags
Auditors test the component accounting split at acquisition and confirm that subsequent replacements (new cabin, engine overhaul) are treated as replacements of the existing component (derecognise the old component, capitalise the new one). Test engine cycle counts from the maintenance system against cycle-based depreciation. Confirm the residual value assumptions — airlines typically assume a 5-15% residual value based on secondary market estimates. Review whether fleet retirement decisions require accelerated depreciation on aircraft with shorter remaining economic lives.
📄 Required Documentation
Aircraft asset register with component breakdown, depreciation schedule by component, engine cycle/hour log from maintenance system, cabin refurbishment records, residual value assessment by aircraft type, fleet retirement plan, and component replacement accounting for major overhauls.
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