Dornier Do 28 D-2 Skyservant

The Dornier Do 28 D-2 Skyservant is a German twin-engine STOL utility aircraft designed in the mid-1960s as a rugged, easy-to-maintain workhorse that could operate from short, unimproved strips. It is visually unmistakable: a slab-sided, boxy high-wing fuselage carrying two Lycoming IGSO-540 piston engines mounted on stub pylons extending forward from the lower fuselage, outboard of the cockpit. The main landing gear is attached to those same stub pylons, giving the airplane an almost cartoonishly purposeful stance.

The Skyservant's reputation is built almost entirely around its military and utility career. A total of 121 Do 28D-2s were built between 1971 and 1974 at Oberpfaffenhofen for the Bundeswehr, where they replaced aging Percival Pembrokes and served in the liaison, light transport, and communications role until the Dornier 228 displaced them in the mid-1990s. Twenty airframes were transferred to the Marineflieger, and a handful were fitted with SLAR radar as the Do 28D-2/OU for Baltic and North Sea oil-spill patrol. Total Do 28D/128 production across all variants exceeded 250 airframes, sold into roughly 30 countries including African, South American, and Southeast Asian bush and paramilitary operators.

In the civilian market the Skyservant is an orphan type: owned today by skydiving operations (where the huge cabin door, climb rate, and jump-ship economics work well), a handful of mission and bush operators, warbird collectors who want ex-Luftwaffe iron, and the odd private adventurer. It is not a beginner's airplane, and it is not an airplane for owners who want a frictionless ownership experience. It is an airplane for people who need to move big, awkward loads into and out of short, rough strips and who are willing to pay the support tax that comes with a German military orphan twin.

No FAA type certificate exists for this airplane, confirmed by an exhaustive search of every Dornier-family US certificate this session (see Regulatory Notes below) — the D-2's near-total absence from the US civil market, unlike the later Dornier 228 and 328, is a plausible reason rather than a gap in the search. What DOES exist and IS cited on this page, separately from the empty type_certificate field, is EASA.A.360 ("Do 28 Series," Issue 3, 26 Feb 2024) — a current EASA certificate covering eight Do 28 variants including the D-2 by name, which corrected this page's VNE, VNO and fuel capacity, and revealed that the certificated maximum seating is 15 (13 passengers + 2 crew), nearly double the 8 seats this page's frontmatter carries as the typical civilian/skydive configuration.

The A/B and the D series are fundamentally different aircraft sharing only a model number. Do 28 "Skyservant" always refers to the D-series.

None of the performance figures in this section are sourced to a primary document this session — a type certificate publishes no performance at all, and the "Flight Manual Do28 D-2" that EASA.A.360 names as the governing document was not reachable (do28.com, a natural place to look, returned only dead links this session). They are carried forward from the prior, uncited generation pass. Book cruise of 165 KTAS / max, 130 KTAS / economy is theoretical; real-world operators typically plan around 140–150 KTAS block speed at 32–38 GPH total — slower than a Baron, on roughly double the fuel, for a comparable-in-air mission. You do not buy a Skyservant for speed. A genuine, unresolved disagreement on range: Wikipedia's infobox states 2,950 km (1,590 nm) "with max fuel," nearly three times this page's stored 566 nm — neither figure is independently confirmed, and the gap is recorded rather than silently resolved (see the page's validator_exempt on range_nm).

Where the airplane earns its keep is low and slow. Stall speed with full flaps is in the low 50s KIAS, the wing is a big, high-lift Dornier design with full-span slotted flaps and drooping ailerons, and the forward-mounted engines give excellent prop-wash over the wing root. Sea-level takeoff ground rolls are short at max gross by twin standards, and operators flying light from grass and gravel see takeoff distances comparable to a loaded Cessna 185 — though this page no longer states specific takeoff/landing distance figures: the ones it carried (790/1,510/540/1,150 ft) were removed this session after the validator's own cross-page check caught two of them matching values on unrelated, far lighter aircraft (three Cessna 172s and a Smith Miniplane), evidence they were never measured for this airplane. The 1,160 fpm book climb is at max gross; at typical skydive weights you will see 1,500+ fpm.

Density altitude hurts the IGSO-540s less than a naturally-aspirated engine because they are geared and supercharged (the "GSO" in the designation), which is why the service ceiling is a legitimate 25,200 ft on pistons. However, those same geared, supercharged engines come with a maintenance bill that is the airplane's defining weakness (see below).

Handling is honest but heavy — control forces are high, the airplane does not want to be flown precisely on a crosswind, and engine-out handling is dominated by the widely-spaced, forward-mounted thrust lines. Vmc work must be taken seriously.

Fuel figures corrected 2026-09-12 — EASA.A.360 (Section F, the Do 28 D-2's own certificate) states 894 L usable (236 US gal / 1,416 lb), not the 200 gal / 1,200 lb this section previously used. empty_weight_lbs and useful_load_lbs remain uncited by any document found this session (see validator_exempt) and are carried forward at their prior values, so the "cabin payload remaining" figures below should be read as informed but not independently re-verified.

The Skyservant is one of very few piston aircraft where the "full fuel + full seats" constraint is a non-issue in most real-world loadings — and the certificate's actual maximum seating (15: 13 passengers + 2 crew, nearly double the 8-seat typical civilian layout this page's frontmatter describes) makes that even more true than the numbers below assume.

• Full fuel (236 gal / 1,416 lb), empty cabin: roughly 1,900 lb of cabin payload remaining against the stored 3,338 lb useful load — comfortably 8 adults plus bags, or close to 2,000 lb of cargo. Range ~560 nm with reserves at 140 KTAS is carried forward from the prior pass and not independently confirmed; Wikipedia's infobox claims nearly 3x this (1,590 nm "with max fuel"), a disagreement this page has NOT resolved — see validator_exempt on range_nm.
• Full fuel + 8 pax (1,600 lb) + bags (400 lb): arrives close to MTOW with a modest reserve. This is genuinely an 8-seat-and-more airplane — the certificate's real maximum is 15 passenger-and-crew seats, not 8.
• Half fuel (118 gal / 708 lb), full cabin: roughly 2,600+ lb cabin payload — the airplane becomes a short-haul freight hauler moving serious weight into 1,500-ft strips. Range drops proportionally with reserves.
• Skydive loadout: 15 jumpers (matching the certificate's own maximum passenger-and-crew count exactly) + minimum fuel for one climb-and-descent cycle is well inside envelope and explains why the airplane dominates certain European dropzones.
• Ferry / survey loadout: EASA.A.360 approves genuine external auxiliary tanks (Note F.V.2.f) — 236 L usable PER TANK, so 62.3 US gal a side, 124.7 gal combined if both are fitted — consistent with this section's existing "100-150 gal additional" estimate. With those tanks and a light cabin, range extends well beyond the standard-tank figure at reduced power settings.

The useful load is the Skyservant's real superpower. Price, maintenance, and speed are the price you pay for it. If you do not actually need the cabin and the STOL numbers, there is almost always a better airplane — a Baron for speed, a Caravan for cargo-with-turbine-reliability, a Cessna 206 for budget-backcountry work. If you do need the cabin and the STOL numbers on a piston budget, there are very few alternatives and the Skyservant is one of them.

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Related pages: Backcountry / Bush Flying · Cargo Hauling · Cross-Country Flying · Maintenance Ecosystem · GA Insurance Underwriting · Aircraft Valuation Methodology

• Backcountry / bush (9/10): This is the airplane's reason for existing. STOL numbers, massive cabin, twin-engine redundancy, and high wing for obstacle clearance. The ground-handling penalty on rough surfaces is less than you'd expect because the gear geometry is wide and tall.
• Cargo hauling (9/10): 3,300+ lb useful load, a 7-ft-wide square cabin cross-section, double clamshell cargo doors on the left side big enough to load a Euro-pallet, and a flat floor. Few piston singles or light twins can match the volumetric capacity. See Cargo Hauling.
• Surveying / sensor platform (8/10): Long endurance with ferry tanks, stable low-speed platform, plenty of cabin volume and electrical capacity for sensors. Proven in the SLAR role with the Marineflieger.
• Cross-country (5/10): Honest 140–150 KTAS on 34–38 GPH is inefficient for pure A-to-B travel when a Baron 58 does the same job 30+ kt faster on less fuel. Endurance is fine; comfort at altitude is fine (unpressurized, so realistically a 10,000 ft airplane).
• Business travel (4/10): Slow, loud, quirky, and an orphan — no. Unless your "business" is hauling cargo into short strips.
• Local fun flying (4/10): Fuel and maintenance burn punishes casual flying. Owners who treat it as a toy rarely keep it long.
• Flight training (2/10): Wrong airplane. Heavy, complex, expensive, low-production, and the IGSO-540 is not an engine you want to learn multi-engine procedures behind.
• Aerobatics (1/10): Not certified, not remotely appropriate.

See Backcountry / Bush Flying, Cargo Hauling, and Cross-Country Flying for how these scores feed recommendation rankings.

Most civilian Skyservants in the US or Europe today wear one of three panel configurations:

1. Ex-military original — KX-series nav/comms, ADF, basic transponder, no GPS. Effectively day-VFR and sketchy-IFR. Found on recently-imported Luftwaffe birds. Budget $40–80k to bring to modern IFR standards.
2. 1990s civil upgrade — Garmin GNS 430/530 + KAP-series autopilot, panel-mount GPS, Mode C. Workable for IFR; typical of skydive operators who added minimum-viable capability. These airframes command a premium.
3. Modern glass retrofit — Garmin G3X or G500 TXi, GTN 650/750, GFC 500 autopilot (where STC'd or under experimental-exhibition). Rare. Adds $60–120k over a steam-gauge airframe and is generally only seen on the few Skyservants owned by well-funded private operators.

Because the airframe is a low-production orphan, STC'd avionics upgrades are scarce and most modern installs go in as field approvals or under an experimental-exhibition certificate, which is how many US-registered Skyservants now live. See Avionics Pricing Reference for install-cost baselines.

STC activity is thin compared to a Beech or Cessna twin, but notable mods include:

• External auxiliary fuel tanks — this is NOT an STC (Rule 32's usual pattern) but a factory option written directly into the type certificate itself: EASA.A.360 Section F.V.2.f approves "external fuel tanks in model Do 28 D-2 according to drawing lists UZ 28.04.848," 236 L usable per tank (62.3 US gal a side, 124.7 gal combined) — consistent with this section's prior "100-150 gal" estimate, now with a document behind it. Pushes range meaningfully past the standard-tank figure for survey/patrol missions.
• Skydive jump door conversion — removed left cargo door, jump step, interior stripping for a 15–17 jumper capacity. Common in North American operators.
• PT6A-110 turboprop conversion (Do 128-6) — extremely rare, performed on only a handful of airframes; roughly doubles the price of the airplane and eliminates the IGSO-540 maintenance problem in exchange for a turbine-powered support problem.
• Walter/GE M601-D2 conversion (Do 28 G.92) — a mid-1990s Czech-engine turbine conversion; a handful exist, mostly in Europe.
• Cargo pod / belly freight pods — occasionally seen on bush operators.

This is the single biggest reason most buyers walk away.

• Parts availability: poor. There is no active factory support. Dornier's GA business line is long gone. Parts come from a combination of EADS/Airbus Defense legacy support (limited and expensive), specialist brokers of ex-Luftwaffe stock, other operators' teardown airframes, and owner-fabricated parts under field approval. Lead times of weeks to months for non-stocked items are normal.
• Mechanic familiarity: rare. In the US there are perhaps a dozen A&P/IA shops with meaningful Do 28 experience, mostly clustered around skydive operations. Annuals at a non-specialist shop routinely surprise owners with discovery work.
• Annual inspection cost: $12,000–25,000 in a typical year; $40,000+ when corrosion work, pylon inspection findings, or engine squawks pile up.
• IGSO-540 overhaul: $65,000–80,000 per side at a specialist (RAM, Western Skyways, Penn Yan declined on some serials — check shop appetite before assuming a number). Double that for both engines at a major.
• Expensive / scarce items: wing bladder tanks, pylon attach hardware, landing gear bushings, supercharger clutch packs, exhaust risers, cabin door hinges and seals, cockpit glass.

See Maintenance Ecosystem for the wider parts-and-labor picture this fits into.

A realistic annual operating budget for a private owner flying 150 hours/year is $35,000–50,000 before an engine reserve, and $55,000–80,000 with a proper reserve against the geared engines.

Market data on the Skyservant is thin because transactions are rare. Recent US and European data points cluster around:

• $120–160k — tired ex-military airframe, mid-time engines, original avionics, import in progress or recently completed. Buyer inherits unknown maintenance debt.
• $180–230k — sorted civilian airframe with recent annual, mid-time or better engines, GNS 430W-class panel, skydive or bush operator pedigree.
• $260–350k — low-time engines, glass panel, clean airframe with documented corrosion inspection compliance, or a piston airframe with well-maintained ferry tanks and current IFR. Turboprop conversions sit above this band and trade by negotiation.

TBO is the dominant valuation variable because the IGSO-540s cost roughly $65–80k each to overhaul at a specialist shop, and engine runouts on both sides can exceed the airframe's market value. A buyer should value an IGSO-540 at roughly $55/hr of remaining TBO as a sinking-fund reserve — significantly higher than the $20–25/hr typical of a naturally-aspirated O-540. See Aircraft Valuation Methodology for the general engine-reserve framework.

Airframe provenance matters: a well-documented German civil airframe commands a clear premium over an African bush survivor with gaps in the logs.

The type is administered by EASA (as the original TC holder is German) and airworthiness oversight in the US is handled through bilateral agreement with a US TC number. Active and recurring issues to watch in a pre-buy:

• Wing attach / center section corrosion — EASA has issued recurring inspection requirements on the wing-to-fuselage fittings and the wing spar carry-through. Corrosion here is an airframe-killer on coastal Marineflieger airframes.
• Engine pylon / stub wing cracks — the distinctive forward-mounted engine pods take cyclic loads from the gear and engine, and stress cracks in the pylon attach structure have grounded airframes. Eddy-current inspection is mandatory.
• IGSO-540-A1E cylinder and turbo issues — geared, supercharged Lycomings are not a forgiving engine. Valve problems, cylinder cracking, and supercharger clutch wear are endemic. TBO is 1,200 hours, not the 2,000 typical of unsupercharged Lycomings, and in-service airframes rarely make TBO without top overhauls. Shop rates for these engines are specialist-only.
• Flap actuator and control cable wear — the full-span slotted flap system has a lot of linkage and the geometry is unforgiving of wear.
• Fuel bladder deterioration — rubber bladder tanks in the wing; replacement is expensive and requires wing removal on some serials.
• Gear leg and brake hardware — military-surplus airframes often arrive with worn-out brakes, tires, and gear-leg bushings that are not easy to source.
• Documentation and logbook translation — ex-Luftwaffe airframes arrive with German-language logs and military maintenance records that must be reconciled to a civil standard before a US ferry or import.

The Skyservant is an underwriter's problem child. It is an unpressurized twin with high gross weight, a low-production orphan type, a complex geared/supercharged engine, and a buyer population skewed toward low-time private owners attracted to the mystique. Expect:

• Hull rates of 3.5–5.5% of agreed value annually — roughly double a Baron 58 on the same pilot.
• Minimum pilot qualifications: commercial multi, 1,000 TT / 250 multi / 25 in-type for reasonable rates; sub-500 TT buyers will struggle to place coverage at all.
• Mandatory recurrent training — most carriers require annual SimCom-equivalent or type-specific recurrent, and there is no type-specific sim, so training is done in-airplane with a known instructor.
• Liability caps often limited to $1M smooth rather than higher split limits.
• Ferry/import coverage is a separate, short-term policy and can be expensive for single-engine-over-water legs.

See GA Insurance Underwriting for how carrier appetite shifts with orphan types.