Props and the N reg

[Flyboy-F33]

Some clarification needed here.

Can anyone confirm whether manufacturers recommended overhaul periods for props (either 5 or 6 years depending on make) are mandatory?

I thought I had read somewhere that they can be run 'on condition'.

This is not to debate the sensibility of running 'on condition' but the legality

[Genghis the Engineer]

It'll depend upon what is actually stated in the maintenance manual for that aircraft / prop.

G

[Flyboy-F33]

Surely the manual would contain the manufacturers recommendations?, but that isnt necessarily the legal requirement? That would be somewhere if FAR part 91 or part 43. trouble is, I cant find it

[Genghis the Engineer]

The manual is approved by the FAA, they decide what is mandatory, not the manufacturer ultimately.

G

[javelin]

Which brings up an interesting point for aeroplanes on the UK register.

I understand that you can either opt for a Notice 75 schedule or operate to the manufacturers schedule, then overhaul.

I once looked at a Zlin that hadn't had a Notice 75 for 5 years, it's C of A had been renewed because it was operating to the manufacturers overhaul schedule.

Comments welcome because I detest the thought of doing Notice 75's on a perfectly serviceable prop.

[Onan the Clumsy]

It may...depend on how the a/c is used. For instance in the US, engine TBO is mandatory for commercial use, but optional for private only use.


What do you mean by N reg btw?

[Flyboy1976]

According to the FAA it is mandatory to comply with the maintenance manual.

BUT as a rule prop and engine overhaul lives are stated in a service bullitins which are not considered mandatory by the FAA.

Therefore if you are operating on the N-Reg under Part 91 (private) you do not have to carry out prop or engine overhauls if you dont want to.

[Keef]

I thought Notice 75 was extinct now, and G aircraft fly to the manufacturer's recommended service intervals?

We had ours done at 5 years after the Notice 75 (and needed a new prop).