Engine programs — ESP, JSSI, MSP, TAP — convert lumpy hot-section and overhaul events into predictable hourly reserves. They are also one of the most misunderstood line-items in pre-owned aircraft transactions.
What a program actually does
You pay an hourly rate while operating; the program pays for scheduled and unscheduled engine events covered by the contract. The economics work because the program pools risk across a fleet of similar engines.
The four big programs
- ESP (Honeywell Engine Service Program) — Honeywell engines (HTF7000, TFE731). Manufacturer-backed, well-regarded.
- JSSI (Jet Support Services) — multi-OEM, third-party. Most flexible, broadest fleet coverage.
- MSP (Rolls-Royce CorporateCare) — BR710, BR725, AE3007. OEM program for Rolls-powered jets.
- TAP (Pratt & Whitney Eagle Service Plan / TAP Blue / Elite) — PT6, PW305, PW306. PWC's family of programs.
What they cover — and what they don't
All four cover scheduled hot-section and overhaul events; most cover unscheduled removal up to a defined limit. None cover FOD, neglect, or operator error. APU coverage is usually a separate, optional add-on.
Pro-rated vs no-program
A pro-rated program at sale is worth 4-8% of asking on the right airframe. A no-program engine close to hot-section due is worth a discount — sometimes a deep one. The buyer who knows the gap walks in calmer.
Watch for
Lapsed programs, under-reported hours, and pre-existing exclusions are the three landmines. Pull the program statement directly from the program administrator, not the seller's broker.