Not every Boeing APU sourcing situation calls for the same transaction structure. An exchange and a lease are both widely used in the commercial aviation aftermarket, but they serve different operational needs, carry different financial implications, and suit different maintenance scenarios. Understanding which structure fits a given situation before reaching out to a supplier saves time, reduces cost exposure, and produces better outcomes on both sides of the transaction.
How Each Structure Works
A Boeing auxiliary power unit lease provides a serviceable unit for a defined term. The operator pays a lease rate for the period of use and returns the unit at the end of the term in accordance with redelivery conditions agreed before execution. The lessor retains ownership throughout. A lease does not require the operator to have a core unit available. It is a straightforward access arrangement that gives the operator use of a serviceable APU for as long as the lease term runs.
An exchange works differently. The operator receives a serviceable unit immediately and is required to return a like-for-like core unit within an agreed timeframe. The core unit returned is typically the unit removed from the aircraft, whether serviceable or unserviceable. The exchange structure is built around the assumption that the operator has a removable unit to return. If no core unit is available, an exchange is not the right structure.
When A Lease Is The Better Fit
A lease is the appropriate structure when the operator does not have a core unit to return, when coverage is needed for a defined period, such as a scheduled shop visit, or when the operator wants to maintain aircraft availability while their unit undergoes overhaul. Leases are also better suited to situations where the removal is planned well in advance, and the operator has time to negotiate terms, review documentation, and arrange delivery ahead of the maintenance event.
For Boeing platforms with tighter APU supply pools, such as the 747 and 767 families, securing a lease unit in advance of a planned removal is significantly more manageable than sourcing one reactively under AOG conditions. The planning window that a scheduled maintenance event provides is a commercial advantage that operators should use. A lessor who holds direct inventory can confirm availability, disclose LLP limiter values, and begin documentation review well ahead of the removal date.
When An Exchange Is The Better Fit
An exchange is typically the right structure for AOG situations where the operator needs a serviceable unit on the aircraft as quickly as possible and has a removed core unit to return. The exchange model is built for speed. Because the supplier receives a core unit back, the transaction can often be executed faster and at lower net cost than a lease where no asset is returned.
Exchanges also suit situations where the removed unit is repairable, and the operator intends to return it to service after a shop visit. The exchange covers the aircraft during the repair period, and the repaired unit becomes available for future use or return. For operators managing 737 fleets where shop visit turnaround times are well established and core units are consistently available, exchange programs are often the default structure for unscheduled removals.
What To Confirm Before Committing To Either Structure
Regardless of which structure is selected, the documentation requirements are identical. Every Boeing APU transaction should include FAA/EASA Form 8130-3, full ATA 106 ownership trace, a non-incident statement, AD compliance records, and complete LLP status with current CSN and remaining life. These requirements do not change based on whether the transaction is structured as a lease or an exchange.
Redelivery conditions on a lease should be defined in the agreement before execution, covering the minimum LLP remaining life at return, acceptable condition, and required documentation at redelivery. Operators who leave redelivery conditions undefined until the end of the lease term frequently encounter disputes that could have been avoided with clear language at the outset.
Physical location of the unit should also be confirmed before committing. For Boeing widebody APU models where inventory is limited, geographic positioning affects delivery timelines significantly under AOG conditions. A unit located on the same continent as the AOG event can often be delivered within 24 to 48 hours. A unit requiring intercontinental freight adds days to the timeline regardless of how quickly the commercial terms are agreed.
