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  • EASA FTL 2016

    A Generic Interpretation

    Understanding EASA FTL 2016

    Flight and Duty Time Limitations and Rest Requirements.

    Version 1.1

  • Disclaimer

    The documentation is provided AS IS and is solely intended to provide a general understanding of the authors interpretation of the new EASA FTL as amended on 29-Jan-2014.

    The author makes no representations and disclaims any and all responsibility for the completeness or accuracy of the documentation.

    The author reserves the right, at his discretion, to change or modify the documentation as deemed appropriate.

    Copyright 2012-2015,

    Understanding EASA FTL 2016 A Generic Interpretation. All rights reserved.

  • Module 6:

    Acclimatisation with practical examples

  • Acclimatisation

    A CM who is in an acclimated state remains in an acclimated state as long as they remain within a zone +/-2 hours either side of the time zone in which the CM is acclimated to.

    State of Acclimatisation:

    (D) Acclimated to Departure - occurs when a CM has spent sufficient time within a time zone to become acclimated to the time zone for departure.

    (B) Acclimated to Previous Acclimated Time Zone occurs when a CM has spent insufficient time within a time zone to begin the acclimatization process.

    (X) Unknown - when a CM has entered a new time zone and has begun the acclimatisation process but has not spent sufficient time to adjust to the local time zone.

  • Acclimatisation

    Example: a CM acclimated to Paris (UTC + 1), remains acclimated as long as they remain within the following time zones: UTC -1, UTC, UTC + 1, UTC + 2, UTC + 3 at the conclusion of the duty period. Jeddah (UTC + 3) is acclimated, while Tehran (UTC + 3:30) will require the crewmember to become acclimated.

  • Acclimatisation

    Acclimatisation process is also known as re-adaptation.

    Flying across time zones exposes the circadian body clock to sudden shifts in the day/night cycle. Because of its sensitivity to light and (to a lesser extent) social time cues, the circadian body clock will eventually adapt to a new time zone.

    The acclimatisation process follows Table 1 defined in ORO.FTL.105 Definitions

    Time difference (h) between

    reference time and local Time elapsed since reporting at reference time

    time where the crew

    < 48 48 71:59 72 95:59 96 119:59 120

    member starts the next duty

    < 4 B D D D D

    4 and 6 B X D D D

    > 6 and 9 B X X D D

    > 9 and 12 B X X X D

    Table 1 is to be applied when a CM has exited the zone +/- 2 hours from the previous reference time.

  • Acclimatisation

    Time difference between reference time zone and local time, is simply the difference between the time zone where the CM was last acclimated to, and the time zone where a crewmember will begin the next duty.

    Example: CM is acclimated to Paris (UTC + 1) (Reference Time) and will begin the next duty period in Chicago (UTC -6), whereby the Time Difference is 7:00.

    The time elapsed since reporting at reference time to the time of report of the next duty. A conversion to UTC date time will be required to calculate the elapsed time.

    A Report in Paris on 15-Feb-2017 at 10:00 (Local) is 15-Feb-2017 at 09:00 (UTC), the next report in Chicago is on 16-Feb-2017 at 20:00 (Local) is 17-Feb-2017 at 02:00 (UTC), whereby the time elapsed is 40:00.

    Case #1: Since the elapsed time is less than 48:00 (Row 3, Column 1) the crewmember remains acclimated to

    Paris time (UTC + 1).

    Case #2: Had the departure in Chicago been postponed 24 hours, the elapsed time would be 64:00, the CM has now moved into an unknown state of acclimatization (x) (Row 3, Column 2).

    Case #3: Had the departure in Chicago been postponed 60 hours, the elapsed time would be 100:00, the CM has now moved into an acclimated state of acclimatization (Row 3, Column 4). The CM is acclimated to Chicago Time (UTC -6),

  • Acclimatisation

    Reference Time for the next departure is defined as follows:

    1. When a CM begins the next duty period in an (B) Acclimated to Previous Acclimated Time Zone state to the reference time is the time zone where that cm was last acclimated to.

    2. When a CM begins the next duty period in an (X) Unknown state there is no reference time. 3. When a CM begins the next duty period in an (D) Acclimated to Departure state the

    reference time is the local time zone where the duty period begins. 4. Should the CM remain within the zone of acclimatisation, the reference time is the local

    time zone where the duty period begins.

  • Acclimatisation

    Examples: Duty 1:

    A CM starts a series of duty periods in an Acclimated state in Paris (UTC+1). The CM will be considered Acclimated to the next Duty period as long as it is within the following time zones

    (UTC-1, UTC, UTC+1, UTC+2,UTC+3). The Duty ends in Helsinki (UTC+2). The Reference time is Paris (UTC+1).

    Duty 2: The CM is considered acclimate at the start of the duty period (UTC+2). The CM will be considered Acclimated to the next Duty period as long as it is within the following time zones

    (UTC, UTC+1, UTC+2,UTC+3, UTC+4). The Duty ends in the duty ends in London (UTC). The Reference time is now considered to be Helsinki (UTC+2).

    Duty 3: The CM is considered acclimate at the start of the duty period (UTC). The CM will be considered Acclimated to the next Duty period as long as it is within the following time zones

    (UTC-2, UTC-1, UTC, UTC+1,UTC+2). The duty ends in New York (UTC-5). The Reference time is now considered to be London (UTC).

    Duty 4: Since the CM ended Duty 3 more than 2 hours from the previous Reference time Table 1 must be used to

    determine the CMs state of acclimatization: 1. What is the time zone difference from the previous time zone (UTC (UTC-5)) = 5 2. Time elapsed since reporting at reference time = Report Time Duty 4 Report Time Duty 3.

  • Acclimatisation

    Duty 4: Since the CM ended Duty 3 more than 2 hours from the previous Reference time Table 1 must be used to determine the

    CMs state of acclimatisation: 1. What is the time zone difference from the previous time zone (UTC (UTC-5)) = 5 (Use Row 2) 2. Time elapsed since reporting at reference time = Report Time Duty 4 Report Time Duty 3.

  • Acclimatisation

    Duty 4 (Case B): The CM is considered acclimate at the start of the duty period. The CM will be considered Acclimated to the next Duty period as long as it is within the following time zones

    (UTC-2, UTC-1, UTC, UTC+1,UTC+2). The duty ends in London(UTC). The Reference time is Still considered to be London (UTC). Duty 5 will be considered acclimated.

    Duty 4 (Case D): The CM is considered acclimate at the start of the duty period (UTC-5. The CM will be considered Acclimated to the next Duty period as long as it is within the following time zones

    (UTC-7, UTC-6, UTC-5, UTC-4,UTC-3). The duty ends in London(UTC). The Reference time is Now considered to be New York(UTC-5). Duty 5 will need to follow the same process as duty 4.

    Duty 4 (Case X): The CM is considered to be in an Unknown state of acclimatisation at the start of the duty period . The duty ends in London(UTC). The Reference time is Still considered to be London (UTC). Duty 5 will need to follow the same process as duty 4.

  • Acclimatisation

    Duty 5 (Case B): The CM is considered acclimate at the start of the duty period. The CM will be considered Acclimated to the next Duty period as long as it is within the following time zones (UTC-2, UTC-

    1, UTC, UTC+1,UTC+2). The duty ends in Helsinki(UTC+2). The Reference time is Still considered to be London (UTC). Duty 6 will be considered acclimated.

    Duty 5 (Case D): The CM is considered acclimate at the start of the duty period (UTC-5. The CM will be considered Acclimated to the next Duty period as long as it is within the following time zones (UTC-2, UTC-

    1, UTC, UTC+1,UTC+2). The duty ends in Helsinki(UTC+2). The Reference time is Now considered to be London (UTC). Duty 6 will be considered acclimated.

    Duty 5 (Case X): The CM is considered to be in an Unknown state of acclimatisation at the start of the duty period . The duty ends in Helsinki(UTC+2). The Reference time is Still considered to be same reference time as Duty 4. Duty 6 will need to follow the same process as duty 4.

  • Acclimatisation

    Duty 6 (Acclimated): The CM is considered acclimated at the start of the duty period (UTC+2). The CM will be considered Acclimated to the next Duty period as long as it is within the following time zones

    (UTC, UTC+1, UTC+2,UTC+3, UTC+4). The Duty ends in Paris(UTC+1). The Reference time is now considered to be Helsinki (UTC+2).

    Duty 6 (Case X): The CM is considered to be in an Unknown state of acclimatisation at the start of the duty period . The Reference time is Still considered to be same reference time as Duty 5. The Duty ends in Paris(UTC+1).

    Required Rest upon return to base: Examine the entire series of duty periods and find the greatest of:

    Find the greatest time zone difference with any duty period start time when compared to the base time. (6 hours) Find the greatest time zone difference with any duty compared to its respective reference time (5 hours)

    Determine the elapsed tim

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