What are the contents of the NOx Technical File?
Short answer
| Item | Description |
|---|---|
| NOx-critical components | Injectors/nozzles, fuel cam/timing, injection pump, turbocharger, charge-air cooler, piston crown, cylinder head, valve timing |
| Allowable ranges | Full range of adjustments or alternatives for those components |
| Engine performance | Rated speed and rated power |
| Verification procedures | On-board NOx verification (parameter check, simplified measurement, direct measurement) |
- Definition: record of all parameters, components and settings of an engine that influence NOx emissions
- Mandatory items: identification of NOx-critical components/settings; allowable adjustment ranges; engine rated speed and power; on-board NOx verification procedures
- Instrument: NOx Technical Code 2008, Chapter 2 §2.4.1
- Indian law: Merchant Shipping Act 2025, section 147 (MARPOL Annex VI)
- Purpose: enables parameter check and direct measurement to verify NOx compliance
Full answer
The full answer explains each point step by step, with the regulations and figures behind it and the discussion from other candidates. It is in the MEO Class I section of the Marine One forum, open to members enrolled for the MEO Class I exam.