Questions tagged [far-121]

Questions about 14 CFR part 121, the set of regulations governing U.S. scheduled air carriers.

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What is the difference between a US Part 121 Supplemental Air Carrier, and a US Part 135 Air Carrier?

I am a little confused after knowing the concept of Part 121 Supplemental Air Carriers in the US. What is the difference with Part 135 Air Carriers? My understanding is that both operate in a non-...
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When is a runway considered to be wet or slippery for 135 or 121 landing performance considerations?

For the purposes of following FAA regulations, when is a runway considered to be wet or slippery in the context of landing performance calculations? Specifically, what definitions or guidance on ...
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Does burning fuel to get to your max landing weight violate any regulations?

Consider a hypothetical situation where where an unexpected tailwind will cause a flight to arrive at its destination above maximum landing weight. After reviewing all reasonable changes to altitude ...
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Are cargo aircraft ever ferried empty?

If the amount of cargo is not evenly distributed across a network a freighter will sometimes have to fly a route not loaded to capacity. Do cargo freighters ever have to be ferried empty to alleviate ...
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Does it violate any regulations for a bag to sit on the flight deck floor?

Pilots who fly the Canadair Bombardier Regional Jet or CRJ aircraft know first-hand how cramped the space on the flight deck is. It's really a business jet cockpit, not the flight deck you'd expect on ...
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Does FAR Part 121 require at least 45 minutes of fuel remaining upon landing?

Assuming the reported weather does not require an alternate airport, if an aircraft being operated under FAR Part 121 domestic IFR lands at its planned destination airport and does not have at least ...
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Is the time pilots are commuting considered rest time?

Pilots operating under FAR Part 121 assigned to domestic routes are required to have a certain amount of "rest" time before beginning a flight. Further, the maximum "flight time," (where the pilot ...
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Would a "fuel leak" at the gate be a reportable incident?

This news story shows video of fuel being expelled from a wingtip of a 767, while at the gate. The engines were apparently running during this event. After the cockpit crew learned of what was going ...
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Is GPS considered to be a navigational facility for the purposes of Ops Spec C055?

For 14 CFR 119 certificate holders, Alternate Airport IFR Weather Minimums are prescribed by Operations Specification (Ops Spec) C055, specifically Table 1 of that specification. Below is a generic ...
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What is "Operational Control"?

14 CFR 121 and 135 certificate holders are required to maintain operational control of their flight operations: §135.77 Responsibility for operational control. Each certificate holder is ...
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Who authorizes low visibility takeoff operations for airlines, and what is required?

A previous question pondered the legality and safety of low visibility Part 91 takeoffs. I am wondering about the requirements for low visibility takeoff for commercial airline operators (e.g. Part-...
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What are airline "flag" and "supplemental" operations?

I constantly see regulations which refer to "flag" and "supplemental" operations. For example: 14 CFR 121 — OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS Subpart Q—...
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