How Far in Advance Should You Book a Business Jet Heavy Inspection?
If your aircraft is coming due for a heavy inspection and you have not called a shop yet, you may already be behind. Business aviation maintenance capacity is tight. Technician shortages, aging facilities and shop consolidation are making it harder for MROs to return aircraft to service on the schedule owners expect, and NBAA-BACE 2026 gave the topic its own session, "Navigating the MRO Capacity Crisis."
For owners and flight departments, that turns business jet maintenance scheduling from an administrative task into part of the operating plan. The date you pick, the scope you lock and the records you hand over before induction all affect how long the aircraft sits. This guide covers the booking windows published sources recommend, a suggested planning timeline, the delays shops see most often, and a checklist to finish before the aircraft arrives.
Why shops are booked out
Coverage of the NBAA session cited three pressures: a shortage of experienced technicians, aging facilities, and ownership consolidation among MROs. Of the three, technician retention is the one owners tend to underestimate. In the words of Suresh Narayanan of Coltala Aerospace, as reported by GlobalAir, "retention is the schedule." When a veteran technician leaves, the type knowledge leaves with them, and a newer technician needs supervision, which can pull the shop's best inspector off your aircraft.
If you have worked around heavy checks, that will sound familiar. A well-staffed crew that has opened your model many times finds problems early and keeps the work moving. A crew that is learning as it goes can still do good work, but the schedule has less margin.
What the published guidance says about lead time
Two independent sources give the same range for major work:
GlobalAir's NBAA coverage reports Narayanan recommending that owners book a major inspection on a midsize jet 9 to 12 months ahead, and no less than 6 months.
A 2025 AIN piece from Western Aircraft (sponsored content) says larger work scopes are best planned and scheduled at least nine to 12 months in advance, especially when the customer has date requirements. Smaller scopes can be booked on shorter notice, and some inspections on certain types book even further out.
A separate GlobalAir article on vetting MROs says heavy inspections may need to be scheduled a year or more ahead to secure hangar space.
Treat these as published guidance, not a rule. None of the sources gives a hard wait time, and the real answer depends on your aircraft type, the scope, the season and the shop. Ask your provider what its calendar looks like for your specific inspection before you assume anything.
A planning timeline you can adapt
The following is a suggested process built around the 9 to 12 month window, not a regulatory requirement. Your maintenance program, your aircraft and your shop will move the milestones.
12 to 9 months out: pick the shop and get on the calendar
Pull your maintenance program due list, both calendar-based and hour-based items, and identify the window when the inspection must be done.
Talk to two or three shops about slot availability and experience on your model.
Give the shop access to your due list or tracking system so it can price and schedule accurately.
Involve the DOM, chief pilot and dispatcher now, and tell the shop about non-negotiable trips early.
9 to 6 months out: define scope
Decide what else belongs in the visit: service bulletins, modifications, avionics, interior or paint.
Review upcoming mandates and due items so the aircraft is not grounded twice in a short period.
Sign the proposal promptly and pay deposits on time. The Western Aircraft piece notes that a late signature can cost you your input date.
6 to 3 months out: parts and paperwork
Order long-lead items early. One AvBuyer planning guide advises at least three months of notice for added bulletins, modifications or interior work, because late requests collide with staff already allocated.
Reconcile your maintenance tracking against the logbooks, and document known discrepancies.
Complete a records review so the shop is not waiting on missing entries when the aircraft arrives.
3 months to induction: lock it down
Confirm the scope in writing and treat additions after this point as exceptions.
Name who can approve findings and up to what dollar amount (more on that below).
Arrange backup lift or charter before the aircraft goes down.
Attend the pre-input meeting with the shop and confirm the induction date.
Redelivery: protect the first trip
The Western Aircraft piece quotes its director of operations calling critical flights scheduled immediately after redelivery "a high-risk scenario." Leave a buffer for final checks, squawks and the unexpected before the trip that matters.
What actually delays an inspection
The NBAA coverage lists five causes that come up again and again. Each one is something an owner can influence.
Slow approval of over-and-above findings. Prevent it by naming a decision-maker and an approval threshold before induction.
Parts and repair turn times. Share your records early so the shop can anticipate likely replacements, and ask about repair or engineering partners and swap or rental options.
Late scope additions. Paint, interior and avionics requests that arrive after planning is complete compete with work already scheduled.
Missing records or a late induction. If the aircraft arrives late or its documentation is incomplete, the slot you reserved may not be there when you are ready.
A shop or vendor that does not have the technicians it quoted. Ask how long the crew has worked together and on your type.
One more observation from the AIN piece: in a long inspection, adding an item such as a connectivity install may add little or no time, while interior woodwork can set the pace. The only way to know is to ask the shop how the added work fits into the critical path. If you are weighing an upgrade, our guide to a business jet Wi-Fi retrofit covers how to plan one alongside an inspection.
Approve findings fast
Over-and-above findings are discoveries outside the agreed scope, found once panels are open and components are inspected. They are normal. What hurts is the wait for approval.
Here is a hypothetical example, not a real customer case. An aircraft is opened for a heavy inspection and the crew finds corrosion that needs repair. The shop sends an estimate that afternoon, but the only person authorized to approve it is traveling and unreachable for several days. The aircraft sits, the crew is reassigned to other jobs, and the delay is no longer caused by the finding itself.
The fix is simple. Before induction, name a primary and backup decision-maker, agree on a dollar threshold under which the shop can proceed, and agree on how fast you will respond to anything above it.
Questions to ask before you book
Part 145 approval confirms a shop can legally perform the work. It does not tell you whether the crew has experience on your model. Before you commit, ask:
How many technicians on the crew are factory trained on my type, and how long have they been with the shop?
Which work is done in-house, and which is sent out (reversers, landing gear, interior, avionics, paint)?
Is the model-specific tooling owned or rented, and is it reserved for my inspection?
How many projects does the project manager handle at once, and who backs them up?
How will you communicate, how often, and how are new discrepancies reported?
How are consumables, overtime and billing increments defined in writing?
How have recent ownership changes affected slot priority?
Our post on choosing the right maintenance provider goes deeper on evaluating a shop, and the power of communication in aircraft maintenance covers what good updates look like.
Pre-induction checklist
Inspection window and tolerances confirmed against your maintenance program
Shop slot, induction date and signed proposal in hand
Scope defined in writing, including optional bulletins and modifications
Long-lead parts identified and ordered
Logbooks and tracking reconciled; known discrepancies documented
Decision-maker, backup and approval threshold named
Backup lift arranged
Pre-input meeting scheduled
No critical trip planned immediately after redelivery
For a worked example of scoping a major event, see our guide to the Challenger 604 48-month inspection.
Frequently asked questions
How far in advance should I book a business jet heavy inspection?
Published guidance for a major inspection on a midsize jet is 9 to 12 months ahead, and no less than 6. Confirm the actual lead time for your aircraft and scope with your maintenance provider.
Can I get a shorter-notice slot?
Sometimes. Smaller scopes generally need less notice, and flexibility on dates makes it easier to find an opening. Do not count on it for a major inspection.
What causes the most delays during an inspection?
The most common causes reported are slow approval of findings, parts and repair turn times, late scope additions, missing records or late induction, and shops short of the technicians they quoted.
Should I add upgrades to the inspection?
It can make sense, because the aircraft is already out of service. Decide early, put the scope in writing, and ask the shop how the work affects the critical path.
What is an over-and-above finding?
A discrepancy found during the inspection that was not part of the agreed scope. The owner or operator typically approves the additional work before the shop proceeds.
The bottom line
The inspection is won or lost before the aircraft arrives. Book early, give the shop your due list and records, lock the scope, and decide in advance who approves findings and how fast. None of it is complicated, and all of it shortens downtime.
If you have an inspection coming due in the next 12 to 18 months, talk to the EJS team about your schedule, scope and records before you commit to a date. Contact EJS.
Question for you: What is the longest an inspection has run past its quoted date on your aircraft, and what caused it?
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