Mooney M22 Mustang

The Mooney M22 Mustang holds a singular place in general aviation history: it was the first pressurized piston single ever certified. Designed under Ralph Harmon as Mooney's flagship, it was a wholly new airframe — not a stretched M20 — with a wider, longer fuselage, a taller vertical fin with leading-edge fillet, and a 310 hp turbo-supercharged Lycoming TIO-541-A1A up front. The prototype first flew on 24 September 1964, type certification came on 26 September 1966 under TC A4SW, and deliveries ran from 1967 through 1970.

Only 36 airframes were built before the program was cancelled. The Mustang was a commercial disaster: it was enormously expensive to develop, priced above its contemporaries, and Mooney reportedly lost money on every copy. The program's failure contributed directly to Mooney's 1969 bankruptcy. Today the M22 is an orphan within an orphan — a one-off type from a manufacturer that has itself repeatedly gone dormant. Industry estimates put the airworthy fleet at roughly 3–4 aircraft worldwide as of 2025, down from ~24 on the US registry in 2001. Survivors are flown by dedicated collectors and vintage-Mooney enthusiasts, typically in the US and Europe, and maintained by a handful of specialist shops.

Pilots who have flown the type describe it as fast, stable, and impressively capable in the flight levels for a single-piston design — but burdened by a thirsty, short-TBO engine, a fragile pressurization system, and a parts pipeline that no longer exists.

See also: mooney-m20-early for the contemporaneous M20C that ultimately saved the company, and maintenance-ecosystem for orphan-support context.

There are no meaningful sub-variants — the production run was too short and too small for block changes. Some airframes have been re-engined in field with overhauled TIO-541 cores salvaged from Piper Navajo / Beech Duke sources, but these remain the same certified configuration.

Book numbers (65% power, 24,000 ft): 186 KTAS cruise, max cruise near 200 KTAS at altitude, Vne 225 KIAS. Rate of climb at gross is 1,125 fpm sea level, though this tapers quickly above FL180 where the turbo-supercharger and pressurization system are doing real work.

Real-world owners report:

• Cruise honestly delivers ~180–190 KTAS at FL200 on ~19–21 gph, which is very close to book — genuinely competitive with a Cessna P210 or early Malibu.
• Fuel burn is brutal at low altitude. Below 10,000 ft, the TIO-541 wants 22–25 gph and gives up much of its speed advantage. The aircraft is only economical when flown high.
• Cabin altitude is maintained at ~11,000 ft at FL240 (max differential 4.1 psi), which is adequate but not luxurious — less comfortable than a Malibu's 5.5 psi system.
• Takeoff performance is unremarkable — 1,142 ft ground roll at gross is actually worse than a lighter, less-loaded 182RG. The Mustang is not a short-field airplane.
• Hot/high penalty is smaller than non-turbo Mooneys because of the turbo-supercharger, but engine cooling becomes the limiting factor on climb-out in hot weather; extended full-power climbs cook cylinders.

Useful load of ~1,240 lb on a five-seat airframe with 92 gallons of fuel:

• Full fuel (552 lb) + 2 pax & bags: 688 lb remaining — two 200 lb adults plus 288 lb of baggage. Range ~813 nm at 65% power, roughly 4+ hours with reserves. This is the airplane's sweet spot: two people, full tanks, non-stop east coast to midwest at FL200.
• Full fuel + 4 pax: Only ~88 lb for the fifth seat and all baggage combined. Effectively you fly four average adults with minimal bags and no fuel margin, or three adults plus the fifth seat used for baggage.
• Five adults (850 lb) + bags (100 lb): Requires tankering fuel to ~48 gallons (~288 lb), leaving range around 400 nm no-reserve — cuts the airplane's primary strength in half.
• Max-payload scenario (~1,240 lb of people and cargo) requires minimum fuel (~30 gal / 180 lb) and yields only ~200–250 nm of usable range.

In practice, owners fly the Mustang as a fast 2-place pressurized cruiser with kids or a third adult occasionally in back. It is emphatically not a flying-5-people-across-the-country airplane despite its five seats, and the combination of high fuel burn and modest tank capacity means the turbo-pressurized mission only really works at the 2-POB weight.

• Flight Training (1/10): Absolutely not. Complex, pressurized, fragile, expensive, and irreplaceable.
• Backcountry (1/10): Low wing, nosewheel only, gross weight of 3,680 lb, and an engine that cannot tolerate grit or unimproved surfaces. Any off-airport use would be malpractice.
• Business Travel (5/10): In principle this is what it was designed for — pressurized, fast, IFR-capable. In practice, orphan parts, short TBO, and the inability to get AOG support anywhere in the country make it a poor choice for anyone who needs to actually be somewhere on a schedule. A collector who happens to take business trips: fine. A working businessperson: no.
• Aerobatics (1/10): Not certified, not suitable, and the pressure vessel makes G-loading catastrophic.
• Cross-Country (6/10): Legitimate strength. Range ~813 nm, pressurized to FL240, 180+ KTAS — this is a real continent-crosser if you can keep it flying. See cross-country.
• Cargo Hauling (2/10): Useful load ~1,240 lb is respectable, but with 92 gallons (552 lb) of fuel aboard the cabin load collapses to ~690 lb. Small cabin door and sloped floor make loading bulky cargo awkward.
• Local Fun Flying (3/10): It's a rare, pedigreed airplane — some collectors love flying it around the pattern. But the fuel burn and engine management cost make $100 hamburgers into $400 ones.
• Surveying (2/10): No suitable camera ports, poor low-altitude economy, and no aftermarket mission integration. Possible but pointless.

See business-travel for mission scoring rubric.

Original M22s came with state-of-the-art (for 1967) King or Narco radios, a full gyro panel, and a basic autopilot. By 2026 every airworthy example has been updated at least once; typical panels seen today include:

• Minimum-modernization: A legacy King KX-155 / KFC-150 stack with a bolted-on Garmin GNS 430W or GTN 650 — roughly $25k–$40k in panel value over a stock airframe.
• Mid-level: Garmin GTN 650Xi + G5/GI-275 attitude and HSI replacements, legacy autopilot retained. Adds $45k–$70k.
• Full glass: At least one M22 is known to have a dual-G3X Touch + GFC 500 retrofit, STC'd under the generic Mooney AML where applicable. Installation is complicated by the pressurized panel area and non-standard instrument cutouts; expect $100k+ in panel work alone.

Panel work is disproportionately expensive on the M22 because any wiring that penetrates the pressure vessel must be properly sealed and re-certified, and because there is no type-specific AML for most modern STCs — everything becomes a field approval.

See avionics-pricing for baseline avionics costs.

The M22 has almost no dedicated STC library — the fleet was too small for any aftermarket company to recoup development cost. Known modifications:

• Engine overhaul upgrades: TIO-541-E1 core swaps from Piper Navajo Chieftain / Beech Duke donor engines. Not an STC per se, but a common field-approved path to keep an airframe flying when the original A1A core is unobtainable.
• GAMIjectors for TIO-541: available and recommended; improves cylinder CHT balance significantly.
• Shadin fuel totalizer installs: common, field-approved.
• Generic Garmin AML-STCs (G5, GI-275, GFC 500) have been applied by field approval on some airframes; not all instrument positions are covered.

There are no speed mods, no gross weight increases, no gap seals, no winglets, and no engine conversion STCs for this airframe. What you buy is what you fly.

This is the Mustang's defining weakness. See also maintenance-ecosystem.

• Parts availability: poor (orphan). Mooney does not support the type. No new airframe parts have been produced in decades. Survivors scavenge each other; a handful of spare parts caches exist in private hands. Pressure-vessel components (door seals, outflow valves, regulators) are particularly hard to source.
• Engine support. The Lycoming TIO-541-A1A is shared with the Piper Navajo Chieftain and Beech Duke, giving the Mustang its only meaningful parts lifeline. Overhaul shops with TIO-541 experience exist but are not numerous, and 2026 overhaul cost is $80,000–$110,000 depending on cylinder and turbo condition. TBO is 1,300 hours — short by modern standards.
• Annual inspection cost routinely runs $8,000–$15,000 when nothing major is found; discovery items can easily push totals past $25,000.
• Total cost of ownership per PlanePHD is roughly $25,000–$35,000/year for a low-utilization operation, before any major repair or engine event.
• Mechanic familiarity: rare. Only a handful of A&P/IAs have ever touched an M22. Remote operation anywhere off the East Coast / Texas corridor is impractical.
• Community support. The Mooneyspace and Mooney Caretakers forums maintain active M22-owner threads where the tiny owner community shares parts leads and repair experience — this is, in practice, the type's support ecosystem.

PlanePHD's PAPI estimate (as of January 2026) is $191,687 for a typical 1968 M22. Public listings over the past several years have ranged from $139,000 (project/engine-timed-out) to $249,000 (recently overhauled, glass panel, fresh pressurization inspection). There is effectively no liquid market — an M22 may sit for 12–24 months even when priced reasonably.

Major valuation drivers:

• Engine time since major overhaul. An airframe with a fresh TIO-541 is worth $70k–$90k more than one approaching TBO, because the overhaul itself now costs $80k–$100k when a qualified shop can be found and core is available.
• Pressurization currency. A Mustang that holds pressure to book differential at its last inspection commands a significant premium; one that doesn't is essentially an unpressurized airplane with a broken feature.
• Airframe total time is almost irrelevant compared to condition, records, and corrosion state. Most survivors have low total time (under 4,000 hours) because they haven't been flown much.
• Avionics premium caps out lower than on a common type — the limited buyer pool will not pay for a $150k panel in a $200k airframe.
• Collector premium. As the airworthy fleet drops toward single digits, individual examples may appreciate purely on scarcity, similar to the Bellanca Skyrocket or Piper Twin Comanche C/R. This is speculative.

See valuation-methodology for the base framework.

Airworthiness Directives. A handful of ADs apply, most inherited from the TIO-541 engine and Lycoming-wide issues:

• AD 75-08-09 and related — TIO-541 crankshaft inspection.
• AD 79-12-07 — Lycoming connecting rod bolts (fleet-wide 540-series).
• Airframe-specific ADs from the late 1960s and 1970s addressing the pressurization bulkhead, fuel selector, and rudder control system.
• Bendix magneto ADs apply as they do to all TIO-541 installations.

Because the fleet is so small, no recent AD activity is tracked actively.

Common problems and pre-buy red flags:

• Pressurization system leaks. Door seals, pressure bulkhead penetrations, and the outflow valve are all failure points. Any M22 that will not hold pressure is a very expensive fix — replacement door seals are not being manufactured and must be shop-made.
• Cracked engine cylinders and turbo-supercharger failures. The TIO-541 runs hot and has a 1,300-hour TBO that is rarely reached without a top overhaul.
• Fuel cell leaks. Bladder-style cells, long out of production, and patching them is a specialty operation.
• Corrosion at the main spar and wing attach points — same Mooney steel-tube cage as the M20 but carrying a much heavier airframe.
• Undocumented or improperly field-approved repairs. The small fleet means many repairs have been one-offs; pre-buy should include an airworthiness records review by a Mooney-vintage specialist.
• Pilot records. Insurance companies heavily scrutinize time-in-type, which is nearly impossible to accumulate legitimately because the type doesn't exist in rental or training markets.

Getting an M22 insured in 2026 is genuinely difficult. Key underwriting facts:

• No standard hull market. Most major GA underwriters will not quote the type at all. Specialty vintage/warbird markets (Starr, USAIG, certain Lloyd's syndicates) will quote it case by case.
• Hull insurance runs $5,500–$8,500/year on a $200k agreed value — reflecting both the orphan repair cost and the near-impossibility of replacement if totalled.
• Liability limits are often capped at $1M smooth or $100k/$100k per-seat; the usual $1M/$100k structure can be hard to find.
• Pilot requirements are onerous: typically ATP or commercial with instrument rating, 1,500+ TT, 500+ retract, 100+ multi or turbo experience, and documented dual from an experienced Mooney CFI. First-year pilots may be required to fly with a mentor pilot for 25–50 hours.
• Annual inspection by a Mooney-experienced shop is usually a policy condition.

See insurance-underwriting for category definitions.