Engine Maintenance — Power-by-the-Hour Contract
Recording monthly accruals under a power-by-the-hour engine maintenance agreement.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Engine Maintenance Expense (PBH) | Expense (+) | 850,000.00 | - |
| Accrued PBH Maintenance Payable | Liability (+) | - | 850,000.00 |
💡 Accountant's Note
Power-by-the-Hour (PBH) agreements with engine OEMs (Rolls-Royce TotalCare, CFM LEAP support, Pratt & Whitney ESP) provide comprehensive engine maintenance at a fixed rate per flight hour. The monthly cost is the actual flight hours flown multiplied by the contracted rate per hour. PBH agreements transfer the uncertainty of unscheduled engine maintenance events to the OEM.
Practitioner & Systems Framework
💻 ERP Architecture
PBH accruals are calculated monthly by multiplying actual engine flight hours (from the maintenance tracking system) by the contracted rate per flight hour. The rate may be escalated annually by an agreed formula (CPI-based or fixed percentage). PBH contracts are assessed under IFRS 16 — if the contract conveys the right to use an identified asset (e.g., a dedicated spare engine pool), it may contain a lease. The maintenance expense is tracked by aircraft registration and engine serial number. Some airlines receive credits under PBH when events are corrected under warranty — warranty credits reduce the maintenance accrual.
⚠️ Audit Flags
Auditors reconcile PBH expense to actual flight hours multiplied by the contracted rate. Test the flight hour data from the maintenance system against operational data (block hours flown). Confirm the rate escalation applied matches the contract formula. For IFRS 16 assessment, review whether the PBH contract identifies specific spare engines — identified spare pools may require lease recognition. Test warranty credit adjustments for propriety.
📄 Required Documentation
PBH contract (rate per hour, escalation formula, covered events), monthly flight hours from maintenance system, PBH accrual calculation, IFRS 16 spare engine assessment, warranty credit records, OEM invoice reconciliation, and engine event history by serial number.
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