Keep it flying.
Service letters as they issue, manuals under revision control, a warranty written in English, and a service network that quotes from the same public price list you read.
- Service letters
- 5
- Manuals
- 5
- Service centres
- 8
- Charge
- None, ever
Service letters
All current. Subscribe by email in the operator portal.
| Ref | Issued | Subject | Class | Applies to |
|---|---|---|---|---|
| SL-2026-04 | 2026-07-14 | M160T wastegate actuator connector — revised strain relief Field reports of chafed actuator leads under tight cowls. Revised strain-relief boot MA-160-4105-B ships free on request; fit at next inspection. | Recommended | M160T s/n 0001–0088 |
| SL-2026-03 | 2026-05-02 | Coolant blend concentration for sustained OAT below −20 °C Operators in continental winter climates should blend to 55% PG. Tables in Maintenance Manual rev G, §12.4. | Informational | All engines |
| SL-2026-02 | 2026-03-19 | FADEC firmware 4.2.1 — altitude compensation refinement Smooths mixture scheduling through 8,000–11,000 ft. Update via CAN service port; 20 min; no removal required. | Recommended | All engines, firmware < 4.2.1 |
| SL-2026-01 | 2026-01-08 | Torsional damper inspection interval alignment Damper element inspection aligned to 500 h across the range (was 400 h on early M120). Log-book entry only if already inspected. | Mandatory | M120 s/n 0001–0150 |
| SL-2025-07 | 2025-11-21 | Mogas ethanol content — E10 clearance extended to M120H Following 600 h of test-cell and flight validation, 91E10 mogas is cleared for the M120H under the same placards as the M120. | Informational | M120H |
Manuals
Revision-controlled. No login, no charge.
Maintenance Manual
412 pages · issued 2026-06-30
Installation Manual (firewall-forward)
168 pages · issued 2026-04-11
Operator's Manual
96 pages · issued 2026-05-09
Parts Catalog with prices
224 pages · issued 2026-07-01
M120H OEM interface control document
84 pages · issued 2026-02-27
TBO and warranty
3 years / 1,000 hours, whichever comes later.
TBO is 2,000 hours on the M120 and M120H core, 1,800 on the M160T, with on-condition operation permitted for non-certified installations under the published inspection schedule. A factory overhaul is a fixed-price catalog line — you can read what your engine will cost at mid-life before you buy it.
The warranty document is two pages long. We suggest reading the incumbent's first, for contrast.
- COVERAGE
- Complete firewall-forward incl. FADEC & sensors
- TRANSFER
- Follows the engine, not the owner
- OVERHAUL PRICE
- Published: £6,900 (M120) fixed
- CLAIM ROUTE
- Any listed service centre or factory direct
Service centres
Factory service at Filton; 8 centres in all.
| Ref | Location | Scope |
|---|---|---|
| SC-UK-001 | Filton, Bristol, United Kingdom | Factory service, overhaul, test cell |
| SC-UK-004 | Shoreham, United Kingdom | Line + heavy maintenance |
| SC-DE-002 | Leipzig, Germany | Line + heavy maintenance |
| SC-FR-003 | Toulouse, France | Line maintenance |
| SC-SE-005 | Örebro, Sweden | Line maintenance |
| SC-US-006 | Oshkosh, WI, United States | Line + heavy maintenance |
| SC-US-007 | Mojave, CA, United States | Line maintenance, UAV OEM support |
| SC-AU-008 | Bundaberg, QLD, Australia | Line + heavy maintenance |
Fair questions
Asked at every airshow, answered here.
Is the parts catalog really public, with prices?
Yes. Every part number, price and mass is published at /parts and in the PDF catalog. Prices are ex-works Filton and update quarterly. No dealer-only pricing exists.
Can I run supermarket mogas?
M120 and M120H are placarded for 91E10 mogas, UL91 and 100LL. The M160T runs UL91 or 100LL today; an E10 mogas clearance is in flight test. Fuel placards ship with every engine.
What does TBO actually mean here?
2,000 hours (M120/M120H core) or 1,800 hours (M160T) to overhaul, with on-condition operation permitted for non-certified installations under our published inspection schedule. A factory overhaul is a fixed-price line item in the catalog: it is not a surprise.
What is the warranty?
3 years or 1,000 hours, whichever comes later, on the complete firewall-forward package — including FADEC and sensors. Consumables excluded. The warranty text is two pages long and written in English, not legalese.
Is the M120 certified?
The M120 holds a DOA-track design assurance file and is on the certification path for CS-23 installations, with type certification targeted for 2027. All engines ship today for experimental, permit-to-fly, microlight and UAV categories.
What about hybrid batteries for the M120H?
We deliberately don't sell batteries. The M120H exposes a 540 V DC bus and a published ICD; OEMs pair it with the pack that suits their airframe. Two reference pack designs are documented in the ICD.
How long is the current lead time?
M120: 6 weeks. M160T: 9 weeks. M120H: 12 weeks (OEM schedule). A £2,000 refundable deposit holds a build slot; the balance is invoiced at dispatch.
- support@martlet-aero.example
- Phone
- +44 117 496 0219
- Hours
- Mon–Fri 08:00–18:00 UK
- AOG line
- 24 h — number in your operator pack
Customer engineering answers the phone during works hours and answers email inside one working day. No ticket theatre.