Definitions to be applied to FAR Part 117

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Introductory Overview Concept Model

FAR 117.3 Definitions:

Term Definition
Acclimated means a condition in which a crewmember has been in a theater for 72 hours or has been given at least 36 consecutive hours free from duty.
Airport/standby reserve (ASB) means a defined duty period during which a crewmember is required by a certificate holder to be at, or in close proximity to, an airport for a possible assignment.
Calendar day means a 24-hour period from 0000 through 2359 using Coordinated Universal Time (UTC) or local time.
Duty means any task that a flightcrew member performs as required by the certificate holder, including but not limited to flight duty period, flight duty, pre- and post-flight duties, administrative work, training, deadhead transportation, aircraft positioning on the ground, aircraft loading, and aircraft servicing
Duty period means a period that begins when a certificate holder requires a crewmember to report for duty and ends when that crew member is free from all duties.
Fatigue means a physiological state of reduced mental or physical performance capability resulting from lack of sleep or increased physical activity that can reduce a crewmember’s alertness and ability to safely operate an aircraft or perform safety-related duties.
Fatigue risk management system (FRMS) means a management system for an operator to use to mitigate the effects of fatigue in its particular operations. It is a data driven process and a systematic method used to continuously monitor and manage safety risks associated with fatigue-related error.
Fit for duty means physiologically and mentally prepared and capable of performing assigned duties in flight with the highest degree of safety.
Flight duty period (FDP) means a period that begins when a flightcrew member is required to report for duty with the intention of conducting a flight, a series of flights, or positioning or ferrying flights, and ends when the aircraft is parked after the last flight and there is no intention for further aircraft movement by the same flightcrew member. A flight duty period includes the duties performed by the flightcrew member on behalf of the certificate holder that occur before a flight segment or between flight segments without a required intervening rest period. Examples of tasks that are part of the flight duty period include deadhead transportation, training conducted in an aircraft or flight simulator, and airport/standby reserve, if the above tasks occur before a flight segment or between flight segments without an intervening required rest period.
Home base means the location designated by a certificate holder where a crew member normally begins and ends his or her duty periods.
Long-call reserve (LCR) means a reserve period in which a crewmember receives a required rest period following notification by the certificate holder to report for duty.
Night Duty (NFDP) means any part of a FDP that falls within the period 0200 to 0459 hours local time.
Physiological night’s rest means the rest that encompasses the hours of 0100 and 0700 at the crewmember’s home base, unless the individual has Acclimated to a different theater. If the crewmember has Acclimated, the rest must encompass the hours of 0100 and 0700 at the Acclimated location.
Report time means the time that the certificate holder requires a crewmember to report for a duty period.
Reserve availability period (RAP) means a duty period during which a certificate holder requires a reserve crewmember on short call reserve to be available to receive an assignment for a flight duty period.
Reserve duty period (RDP) means the time from the beginning of the reserve availability period to the end of an assigned flight duty period, and is applicable only to short call reserve.
Reserve flightcrew member means a flightcrew member who a certificate holder requires to be available to receive an assignment for duty.
Rest facility means a bunk, seat, room, or other accommodation that provides a crewmember with a sleep opportunity onboard the aircraft.
:Class 1 rest facility means a bunk or other surface that allows for a flat sleeping position and is located separate from both the flight deck and passenger cabin in an area that is temperature-controlled, allows the crewmember to control light, and provides isolation from noise and disturbance.
:Class 2 rest facility means a seat in an aircraft cabin that allows for a flat or near flat sleeping position; is separated from passengers by a minimum of a curtain to provide darkness and some sound mitigation; and is reasonably free from disturbance by passengers or crewmembers.
:Class 3 rest facility means a seat in an aircraft cabin or flight deck that reclines at least 40 degrees and provides leg and foot support.
Rest period means a continuous period determined prospectively during which the crewmember is free from all restraint by the certificate holder, including freedom from present responsibility for work should the occasion arise.
Rest opportunity means a period of time when a crewmember is provided a suitable accomodation.
Scheduled means to appoint, assign, or designate for a fixed time.
Short-call reserve (SCR) means a period of time in which a crewmember does not receive a required rest period following notification by the certificate holder to report for a flight duty period.
Split duty means a flight duty period that has a scheduled break in duty that is less than a required rest period.
Suitable accommodation means a temperature-controlled facility with sound mitigation and the ability to control light that provides a flightcrew member with the ability to sleep either in a bed, bunk or in a chair that allows for flat or near flat sleeping position.Suitable accommodation only applies to ground facilities and does not apply to aircraft onboard rest facilities.
Theater means a geographical area in which the distance between the flightcrew member’s flight duty period departure point and arrival point differs by no more than 60 degrees longitude.
Unforeseen operational circumstance means an unplanned event of insufficient duration to allow for adjustments to schedules, including unforecast weather, equipment malfunction, or air traffic delay that is not reasonably expected.
Window of circadian low (WOCL) means a period of maximum sleepiness that occurs between 0200 and 0559 during a physiological night.
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Introductory Overview Concept Model

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