Final answer:
Among the given options, only the IFR rating explicitly requires an instructor rating do teach. While float ratings typically need an endorsement, VFR OTT and night ratings do not specifically require separate instructor ratings.
Step-by-step explanation:
Instructor Ratings Required for Teaching Specific Flight Ratings
When it comes to teaching specific flight ratings, an instructor rating is essential to ensure that the teaching is conducted safely and effectively. Let's look at the options provided and determine which require an instructor rating:
- a) Float rating - Teaching students how to operate aircraft on floats typically requires a specific instructor endorsement due to the unique skills and safety considerations involved.
- b) VFR OTT (Visual Flight Rules Over-The-Top) - This allows pilots to fly over a layer of cloud but does not necessarily require an instructor rating to teach, as it is generally covered under the larger scope of a basic flight instructor certification.
- c) Night rating - Flight instructors who teach night flying must hold a night rating themselves, but a separate instructor rating specifically for night flying is not required.
- d) IFR rating (Instrument Flight Rules) - Teaching IFR requires a specific instructor rating known as an 'Instrument Instructor Rating'. Pilots cannot teach IFR without this additional qualification.
In conclusion, the only rating from the options listed that explicitly requires an instructor rating to teach is the IFR rating.