Used Beechcraft A36 Bonanza Cost of Ownership: Six-Seat Economics, Engines and Upgrades
This page covers the used six-seat, straight-tail Bonanza: the Model 36 (1968–1969) and the A36 (1970–2005). It answers three budget questions: what the A36 costs per seat, what the IO-520 and IO-550 engines cost to keep, and what common upgrades add.
What does a used A36 cost per year at 50, 100 and 200 hours?
Two examples bracket the used market: an early A36 with the original-type IO-520-BA, and a late A36 with the IO-550-B. The prices are illustrative placeholders for the math. Asking prices run from low six figures for tired early airplanes to well above the late example for low-time, upgraded ones. Check current listings and Vref or Aircraft Bluebook for the specific airplane.
| Line item | Early A36, IO-520-BA (1970–1983) | Late A36, IO-550-B (1984–2005) |
|---|---|---|
| Illustrative price | $240,000 | $375,000 |
| Hangar | $4,800 | $4,800 |
| Insurance (assumption, qualified owner) | $3,300 | $3,900 |
| Annual incl. typical squawks | $6,000 | $6,000 |
| Databases, subscriptions, misc. | $1,200 | $1,500 |
| Fixed total / yr | $15,300 | $16,200 |
| Fuel / hr | 14 gal = $101 | 15 gal = $109 |
| Engine reserve / hr | $55,000 ÷ 1,700 = $32.35 | $65,000 ÷ 1,900 = $34.21 |
| Unscheduled maintenance / hr | $32 | $30 |
| Oil + prop reserve / hr | $7 | $7 |
| Variable total / hr | $173 | $180 |
| Operating cost at 50 hrs (per hr) | $23,936 ($479) | $25,191 ($504) |
| Operating cost at 100 hrs (per hr) | $32,571 ($326) | $34,181 ($342) |
| Operating cost at 200 hrs (per hr) | $49,843 ($249) | $52,162 ($261) |
| Loan payment (15% down, 20 yrs, 7.75%) | $1,675/mo on $204,000 | $2,617/mo on $318,750 |
| All-in at 50 hrs (per hr) | $44,032 ($881) | $56,592 ($1,132) |
| All-in at 100 hrs (per hr) | $52,668 ($527) | $65,582 ($656) |
| All-in at 200 hrs (per hr) | $69,939 ($350) | $83,563 ($418) |
Fuel is priced at $7.24/gal, the AirNav national average, September 2026 (AirNav fuel report). Overhaul budgets include removal and reinstallation. Factory-rebuilt or new engines cost more. Insurance and shop figures are assumptions, not quotes. Loan payments include principal.
What does an A36 cost per seat?
The A36 exists for its cabin: club seating behind the pilots and double doors on the right rear side for loading people and cargo. The economics only beat a four-seat Bonanza when you use that space. Per-seat cost for the late A36 example at 100 hours a year:
| Occupants | Operating cost per seat-hour | All-in (with loan) per seat-hour |
|---|---|---|
| 2 | $171 | $328 |
| 4 | $85 | $164 |
| 6 | $57 | $109 |
The payload check behind the six-seat number
Useful load decides how many of those seats you can fill. It varies from airplane to airplane with equipment, so these are assumed weights only. Use your airplane's actual weight and balance.
- Assumed useful load: 1,350 lb. Full fuel of 74 usable gallons weighs 444 lb, leaving 906 lb.
- Four 180-lb adults (720 lb) leave about 186 lb for baggage with full fuel. That is a comfortable family trip.
- Six 170-lb adults (1020 lb) plus 60 lb of bags leave room for about 45 gallons. After a 45-minute reserve at 15 gal/hr, that is roughly 2.3 hours of flying.
So the A36 is a four-adults-with-full-fuel airplane that can carry six on shorter legs. AvWeb's used-aircraft guide puts typical full-fuel payload near 950 lb (AvWeb), which is consistent with this example. If you regularly need six adults and long range, look at twins. The Baron cost comparison shows what that step costs.
IO-520 or IO-550: what does the engine cost?
The Model 36 and early A36s used Continental's 285 hp IO-520 (the IO-520-BA in the A36). The 300 hp IO-550-B became standard in 1984, and converting earlier airplanes is a popular modification (AvWeb). Continental's TBO table (SIL98-9, Rev. E) lists:
| Engine | Continental TBO | Illustrative overhaul budget | Reserve per hour |
|---|---|---|---|
| IO-520-BA (285 hp) | 1,700 hrs / 12 yrs | $55,000 | $32.35 |
| IO-550-B (300 hp), serial 1006000 and later | 1,900 hrs / 12 yrs | $65,000 | $34.21 |
| IO-550-B, earlier serials | 1,700 hrs / 12 yrs | $65,000 | $38.24 |
Adding the extra gallon per hour of fuel, the late example's engine and fuel lines together cost about $9 per hour more than the early example's. In exchange you get 15 more horsepower, and usually a newer airframe and panel.
Should you convert an IO-520 A36 to an IO-550?
The decision usually comes up when the IO-520 reaches TBO. Compare the two quotes, not the list price of the conversion. With hypothetical quotes of $55,000 to overhaul the IO-520 and $85,000 for an IO-550 conversion, the real cost of the upgrade is the $30,000 difference. Weigh that against climb performance, resale appeal and any change in reserves. Make sure the STC covers your serial number, and that the conversion paperwork (logbooks, weight and balance, flight manual supplement) is complete, because a buyer's pre-buy will check it. For paying for the work, see engine overhaul financing.
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What do common A36 upgrades cost?
Many A36s on the market still have legacy panels. The ranges below are rough installed prices of the kind shops quoted in 2025–2026. They vary widely by shop, equipment choice and how much wiring the panel needs, so treat them as a starting point for quotes, not prices.
| Upgrade | Rough installed range | Budget note |
|---|---|---|
| Engine monitor (all cylinders, fuel flow) | $3,000–$8,000 | Pays for itself in engine care. Many insurers and buyers expect one |
| IFR GPS navigator | $15,000–$35,000 | Depends on the unit and whether an old navigator is replaced |
| Electronic flight displays | $15,000–$40,000 | Often done together with an autopilot to share labor |
| Digital autopilot | $25,000–$60,000 | Check STC eligibility for your serial number |
| Strip and repaint | $25,000–$45,000 | Quality and prep vary a lot. Get references |
| Interior | $15,000–$40,000 | Club-seat interiors cost more than four-seat cabins |
| IO-550 conversion (IO-520 airplanes) | Quote-based | Compare against the IO-520 overhaul quote |
Buyers pay more for a modern panel, but upgrades often don't return their full installed cost at resale. Do them because you'll use them, and plan to keep the airplane long enough to benefit. If you finance a $60,000 package separately over 10 years at 7.75%, the payment is about $720 a month. Some lenders will instead roll planned upgrades into the purchase loan when the appraisal supports the upgraded value. See how appraisals set loan terms.
Financing a used A36
- Down payment and term: AOPA Aviation Finance lists a 15% minimum down for post-1960 singles and terms up to 20 years on loans of $75,000 or more (AOPA).
- Rates: As of September 2026, major aviation lenders quote piston rates from about 7% for well-qualified borrowers to roughly 10%. Rates depend on credit, aircraft age, loan size and down payment. The 7.75% here is illustrative.
- Credit: Most aviation lenders look for 680+, and the best pricing typically starts around 720–730+. See credit score tiers.
- Engine time and the appraisal: A run-out engine lowers the appraised value, and lenders lend against that value. See how engine time affects value.
How this page differs from related Bonanza pages
This page covers the used A36's budget. For all four Bonanza variants side by side, see the Bonanza family cost comparison. For specs, typical prices and payment examples, see the A36 model page. The glass-cockpit successor has two budget pages: the pre-owned G36 and the new or late-production G36. Choosing between Bonanzas is covered in the Bonanza buyer's guide. Moving to a twin is covered in the Bonanza-to-Baron upgrade guide. Other Bonanza model pages: V35B, F33A and G36. If a twin is on your list, see the Baron 58 model page and the Baron buyer's guide.
Frequently asked questions
How much does a used A36 Bonanza cost to own per year?
Using this page's planning assumptions, an early IO-520 A36 costs about $32,571 a year to operate at 100 hours, and a late IO-550 A36 about $34,181, before any loan. With 15% down over 20 years at an illustrative 7.75%, the loan adds $1,675 to $2,617 a month on the example prices.
What is the cost per seat of an A36 Bonanza?
At 100 hours a year, the late A36 example costs about $342 per hour to operate. Spread over four occupants that is about $85 per seat-hour, and over six about $57. You can't usually fill six seats with full fuel, so the six-seat figure applies to shorter legs with reduced fuel.
Which engine does the A36 have, IO-520 or IO-550?
The Model 36 and early A36s used Continental's 285 hp IO-520 (IO-520-BA in the A36). The 300 hp IO-550-B became standard in 1984, and converting earlier airplanes to the IO-550 is a popular modification. Continental lists a 1,700-hour TBO for the IO-520-BA. For the IO-550-B it lists 1,700 or 1,900 hours depending on engine serial number. Both have a 12-year calendar limit.
How many people can an A36 really carry?
It depends on the individual airplane's empty weight. With an assumed 1,350 lb useful load and 74 gallons of fuel, the example leaves about 906 lb for people and bags: four 180-lb adults plus about 186 lb of baggage. Six adults means leaving fuel behind. Always run the numbers from your airplane's actual weight and balance.
Can I finance avionics or engine upgrades on an A36?
Often, yes. Some lenders will fold upgrades into the purchase loan when the appraisal supports the value, and others offer separate avionics or engine loans with shorter terms. As an illustration, a $60,000 upgrade financed over 10 years at 7.75% costs about $720 a month. Terms vary by lender.
Is the A36 more expensive to insure than the F33A?
Not inherently. Both are six-cylinder retractable Bonanzas, and BWI's 2026 Bonanza renewal data found that pilot experience and hull value matter more than the model. An A36 often carries a higher hull value, which raises the hull premium. Retractable-gear time, Bonanza time and an instrument rating move the quote the most.
All cost figures are illustrative planning numbers as of September 2026, not quotes or appraisals. Weights in the payload example are assumptions. Use your airplane's weight and balance.