# N909HH: 2025 MDM Services AL-18

- Status: Valid registration
- Airframe: [MDM Services AL-18](https://openairdocs.org/model/mdm-services-al-18) (registry code 056427M, 3 seats)
- Engine: [Cont IOX370 series](https://openairdocs.org/engine/cont-iox370-series) (registry code 17501)
- Serial number: AL-398
- Year built: 2025
- Type: Fixed wing single engine
- Engine type: 4 cycle
- Kit: American Legend Aircraft Co AL18
- Airworthiness: Experimental, amateur built
- Airworthiness date: October 20, 2025
- Certificate issued: June 27, 2025
- Expires: June 30, 2032
- Mode S code: AC9152
- Registered owner: [Mdm Services LLC](https://openairdocs.org/faa-owner/MDM%20SERVICES%20LLC)
- Location: [Helena, MT](https://openairdocs.org/faa-place/MT/Helena)
- Owner type: LLC
- Owner's area on the map: 46.5307° N, 112.1994° W: Placed by OpenAirDocs at the center of ZIP code 59601, within about 6 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=909HH
- Page: https://openairdocs.org/aircraft/N909HH

From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. The registry lists only the engine series, so ADs for every Cont IOX370 model are included.

## ADs that may apply (OpenAirDocs): 0 in force

### Matched by airframe (MDM Services AL-18)

None in force.

### Matched by engine (Cont IOX370 series)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N909HH.

## FAA accident and incident reports

None matched to N909HH.

## Service difficulty reports

None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

## Service difficulty reports on N909HH not matched to an aircraft (2)

They name N909HH, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft.

- [SDR 2005FA0000376](https://openairdocs.org/sdr/2005FA0000376), Jan 21, 2005: SHAFT. BROKEN. SHAFT SECURING TORQUE LINK TO RT MLG STRUT FOUND BROKEN DURING INSPECTION. THIS TORQUE LINK IS AT TOP OF STRUT AND ROTATES LOWER STRUT 90 DEGREES DURING RETRACT
- [SDR 62691](https://openairdocs.org/sdr/62691), Jan 16, 2003: TIRE. GROOVED. THIS AIRCRAFT HAS CLEVELAND BRAKES INSTALLED. THE CLEARANCE BETWEEN THE TIRE SIDEWALL AND BRAKE IN MINIMAL. WHEN THE SIDEWALL FLEXES DURING LANDING IT CONTACTS 

## STCs that may be installed (OpenAirDocs)

None matched to this aircraft's models.

## Related

- Other MDM Services AL-18 aircraft: https://openairdocs.org/model/mdm-services-al-18/aircraft.md
- The Cont IOX370 series engine: https://openairdocs.org/engine/cont-iox370-series.md

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