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Parts 119,121,125,135

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Bernoulli

Well-known member
Joined
Jan 4, 2003
Posts
227
I've been checking out the different parts for all the Fars and I am a little confused about the commercial parts. I understand that part 119 regards the certification of air carriers and commercial operators...But parts 121, 125, and 135 I don't quite understand. What is confusing me is that I work for a small airline that flys Dash 8's and we can carry up to 37 passengers not including crew, yet the company says we operate under part 121, and the regs says that part 125 is for aircraft that have a seating capacity of 20 or more... So why isn't my company a 125 operation, or for that matter a 135. If anyone is familliar with these parts and has experience with them I sure would appreciate you bringing me up to speed.
 
The key to your question is not so much in the size of the aircraft but the type of operations to be conducted.

Part 121 concerns Domestic, Flag and Supplemental Operations
Part 135 concerns Commuter and On-Demand Operations and Rules Governing Persons on Board such Aircraft
Part 129 concerns Foreign Air Carriers and Foreign Operator of U.S. Registered Aircraft Engaged in Common Carriage

Some aspects of some 121 operations are conducted under Part 135 because of capacity, seating, and propulsion, but this is the exception rather than the rule.

Since your employer is involved in common carriage as a US company, Part 121 does in fact apply.
 
part 125

Part 125 companies are private and can not hold out to the public to provide transportation. Travel clubs, corp operaters
 
Bernoulii,

the key to understanding how Part 125 fits into the the equation is to understand that Part 125 is for operators of large aircraft where "common carriage" is not involved. Examples of this might be; Hauling auto parts on exclusive contracts to the auto company (exclusive contract is not common carriage), delivery of fuel to remote locations where the point of sale of the fuel is the destination (company is carrying it's own fuel, not the customer's) All of these operations would be conducted under Part 91 only, and no certificate would be needed if it were not for the size of the airplane. To put it more plainly, A part 125 operator is a part 91 operator who operates large (part 119 definition of large) aircraft.

Now, Part 121 and Part 135 are for "common carriers", in other words if anyone can walk through the door and buy a ticket, charter an airplane, or ship cargo, than that is common carriage, and either a 135 or a 121 certificate is requred.

As far as why your comapny is operating under a 121 certificate rather than a 135, I'm not sure, the regs are complex and the FAA is in the process of transitioning certain passenger operations which formerly were part 135 to now be under part 121. That's an area of the regs which I'm not too familiar with. Maybe someone else who is more up on that can fill in the rest of the details.

regards
 
Hi...

Sounds like the operation which Bernoulli describes is a scheduled air carrier and not an on demand or commuter operation and therefore would have to be operating under Part 121 rather than Part 135.

Regards
 
Now, Part 121 and Part 135 are for "common carriers", in other words if anyone can walk through the door and buy a ticket, charter an airplane, or ship cargo, than that is common carriage, and either a 135 or a 121 certificate is requred.

As far as why your comapny is operating under a 121 certificate rather than a 135, I'm not sure, the regs are complex and the FAA is in the process of transitioning certain passenger operations which formerly were part 135 to now be under part 121. That's an area of the regs which I'm not too familiar with. Maybe someone else who is more up on that can fill in the rest of the details.

regards [/B]

Scheduled passenger operations in an a/c with 10 or more installed pax seats are conducted under Part 121. Scheduled pax ops with less than 10 installed pax seats may be conducted under Part 135.
 
Hi!

There are a lot of companies that fly 125 for the public. You call them up, tell them you want to charter them (for pax or cargo) and they come pick you up in their 125 plane.

ALso, a number of 125 operators have letters of exception that let them operate their 757, for example, under part 91.

The FAA is going to eliminate 125 completely, and the above part 91 example is one reason.

Cliff
DTW
 

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