Line Maintenance — Routine Operating Expense
Recording the daily and transit maintenance costs to keep aircraft airworthy.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Maintenance & Engineering Expense | Expense (+) | 1,200,000.00 | - |
| Accounts Payable (MRO / Engineering) | Liability (+) | - | 1,200,000.00 |
💡 Accountant's Note
Line maintenance (transit checks, daily checks, A-checks) and routine consumable maintenance costs are expensed as incurred. These are the day-to-day costs of keeping the fleet airworthy. Unlike heavy maintenance, line maintenance does not replace a component or extend the aircraft's life — it simply maintains its current condition.
Practitioner & Systems Framework
💻 ERP Architecture
Line maintenance costs are processed through the AP module against maintenance vendor invoices. Third-party MRO providers (Lufthansa Technik, Air France Industries, ST Engineering) invoice monthly for contracted line maintenance services. Internal engineering costs (airline-employed engineers) are allocated to the maintenance cost centre from payroll. Spare parts consumed in line maintenance are expensed from the rotable spares inventory. Line maintenance expense is tracked by fleet type and route in management reporting — high maintenance cost per flight hour indicates ageing fleet or specific technical issues.
⚠️ Audit Flags
Auditors confirm that line maintenance costs are expensed (not capitalised). Test the distinction between capital and revenue maintenance — any maintenance that adds capability or extends life beyond original specification is capital; routine upkeep is expense. Review maintenance vendor contracts — long-term power-by-the-hour (PBH) agreements for engine maintenance have specific accounting treatment (IFRS 16 assessment for fixed commitments). Confirm spare parts consumed are correctly deducted from rotable inventory.
📄 Required Documentation
Maintenance vendor invoices, power-by-the-hour contract (IFRS 16 assessment), maintenance cost per flight hour by fleet type, engineering payroll allocation to maintenance cost centre, rotable spares consumption record, and maintenance planning schedule.
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