No loaner engine? How to keep a charter aircraft flying through an engine event
A hot section inspection or major periodic inspection is on the calendar, the engine program covers the shop visit, and the service desk puts you on a waitlist for a rental engine. For a Part 135 aircraft that means weeks of lost revenue while the engines sit in a shop.
High charter utilization has kept OEM rental pools stretched for several years. Calling the standard program desk and waiting is often not enough. The operators who keep flying treat the loaner as its own project, start early, and are willing to look outside the OEM pool.
Where lease engines come from
| Source | What to know |
|---|---|
| Engine program rental pool | Usually the first call and often the cheapest if your program covers loaners. Also the longest waitlist. |
| OEM leasing division | Separate from the program service desk on some engine types. Ask to be escalated to it directly rather than relying on the service center to ask for you. |
| Authorized overhaul and repair facilities | Designated overhaul facilities often keep their own rental engines for customers whose engines they are working on. Ask when you book the shop visit, not after. |
| Independent engine lessors | Specialist lessors hold overhauled engines for short and long-term lease, including older types. Useful when the OEM pool is empty. |
| Brokers and parts traders | Sometimes know of an engine on a stand that is not advertised. Treat their information as a lead, and verify records and program status yourself. |
What you will pay outside the program
- A monthly lease fee, often with a minimum term.
- An hourly usage charge for every hour flown on the lease engine.
- Removal and installation labor, twice: your engine off and the loaner on, then the reverse.
- Freight both ways, engine stands and any transport fixtures.
- Condition return costs if the lease engine comes back with findings.
Put all of it in one number and compare it with the revenue the aircraft earns while it would otherwise be down. For a busy charter aircraft the lease usually wins; for a lightly flown one it may not.
Timing
Start looking for lease engines when the shop visit goes on the forecast, not when the aircraft is scheduled in. Even with an engine found today, freight, stands and an installation slot take a couple of weeks to arrange.
A three-engine aircraft needs three lease engines, and a mid-size twin needs two. Make sure the lease engines match your configuration and are acceptable under your maintenance program, and check their records before they ship.
Before you sign
- Confirm the lease engine's program status and whether its hours will be accepted by your program.
- Check the configuration, service bulletin status and any differences that affect installation or the flight manual.
- Agree return conditions, borescope requirements and who pays for findings.
- Line up the shop, the installation crew and the freight on the same dates.
Bottom line
An engine event is a scheduling problem as much as a maintenance one. The earlier maintenance control starts sourcing the lease engines, the more choices there are, and the fewer revenue days the aircraft loses.
General guidance for orientation only. Your MEL, approved manuals and the regulations govern; confirm against them before acting.