What does Part 91 mean in aviation?

Part 91 of Title 14 of the Code of Federal Regulations is a regulation created by the FAA to oversee the operation of a private aircraft. When you own a private jet, you probably need to make sure that your plane, pilot, and flight crew are maintaining the standards set forth in Part 91.



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In Part 91 operations, a pilot can fly an aircraft for days without breaks. In Part 135 operations, pilots follow strict rest requirements between flight sessions as an added safety measure. Pilot qualifications: Part 135 operations regulations impose higher standards for pilot qualifications than Part 91 operations.

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§ 121.481 Flight time limitations: One or two pilot crews. (a) A certificate holder conducting flag operations may schedule a pilot to fly in an airplane that has a crew of one or two pilots for eight hours or less during any 24 consecutive hours without a rest period during these eight hours.

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Crew members who are 65 and older may act as PIC of an aircraft conducting Part 91 operations on international flights. For commercial operations (i.e., those conducted for renumeration or hire, including Part 135 flying), an aviator in a single-pilot operation may not be 60 years or older.

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Pilots operating under 14 CFR Part 91 are strongly encouraged to file and fly a DP at night, during marginal Visual Meteorological Conditions (VMC) and Instrument Meteorological Conditions (IMC), when one is available.

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§ 135.265 Flight time limitations and rest requirements: Scheduled operations. (1) 1,200 hours in any calendar year. (2) 120 hours in any calendar month. (3) 34 hours in any 7 consecutive days.

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Flight times within the duty periods are restricted to a maximum of 8 hours for flight crews consisting of one pilot and 10 hours for flight crews consisting of two pilots. The 8-hour and 10-hour flight time limitations include any additional commercial flying performed by the flight crew during the period.

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The rules limit pilots to a maximum of 60 hours of flight duty per week, defined as 168 consecutive hours. In any consecutive 28-day period, a pilot cannot exceed 290 hours, of which no more than 100 can be flight time.

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