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135 Duty day

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We operate under the following reg.

I don't think it really says a 14 hr duty day. It just limits flying to no more than 10 hours in a 24 hour period with a 10 hour rest period.

Sec. 135.267

Flight time limitations and rest requirements: Unscheduled one- and

(a) No certificate holder may assign any flight crewmember, and no flight crewmember may accept an assignment, for flight time as a member of a one- or two-pilot crew if that crewmember's total flight time in all commercial flying will exceed--
(1) 500 hours in any calendar quarter.
(2) 800 hours in any two consecutive calendar quarters.
(3) 1,400 hours in any calendar year.
(b) Except as provided in paragraph (c) of this section, during any 24 consecutive hours the total flight time of the assigned flight when added to any other commercial flying by that flight crewmember may not exceed--
(1) 8 hours for a flight crew consisting of one pilot; or
(2) 10 hours for a flight crew consisting of two pilots qualified under this Part for the operation being conducted.
(c) A flight crewmember's flight time may exceed the flight time limits of paragraph (b) of this section if the assigned flight time occurs during a regularly assigned duty period of no more than 14 hours and--
(1) If this duty period is immediately preceded by and followed by a required rest period of at least 10 consecutive hours of rest;
(2) If flight time is assigned during this period, that total flight time when added to any other commercial flying by the flight crewmember may not exceed--
(i) 8 hours for a flight crew consisting of one pilot; or
(ii) 10 hours for a flight crew consisting of two pilots; and
(3) If the combined duty and rest periods equal 24 hours.
(d) Each assignment under paragraph (b) of this section must provide for at least 10 consecutive hours of rest during the 24-hour period that precedes the planned completion time of the assignment.
(e) When a flight crewmember has exceeded the daily flight time limitations in this section, because of circumstances beyond the control of the certificate holder or flight crewmember (such as adverse weather conditions), that flight crewmember must have a rest period before being assigned or accepting an assignment for flight time of at least--
(1) 11 consecutive hours of rest if the flight time limitation is exceeded by not more than 30 minutes;
(2) 12 consecutive hours of rest if the flight time limitation is exceeded by more than 30 minutes, but not more than 60 minutes; and
(3) 16 consecutive hours of rest if the flight time limitation is exceeded by more than 60 minutes.
(f) The certificate holder must provide each flight crewmember at least 13 rest periods of at least 24 consecutive hours each in each calendar quarter.
 
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(d) Each assignment under paragraph (b) of this section must provide for at least 10 consecutive hours of rest during the 24-hour period that precedes the planned completion time of the assignment.
 
That's the reg. "Technically" there is no such thing as a 14-hour duty day, but the requirement for having 10 hours rest in a 24 hour period creates it.
 
14 hours of duty can be extended for circumstances unforeseen when the flight was started, i.e weather, ATC delays, etc.
 
mike1mc said:
That's the reg. "Technically" there is no such thing as a 14-hour duty day, but the requirement for having 10 hours rest in a 24 hour period creates it.

The reg does specifically reference a 14 hour duty period.

135.267(c)
if the assigned flight time occurs during a regularly assigned duty period of no more than 14 hours and--
 
I know its splitting hairs, but that part of reg merely states that you cn exceed your flight time limitations if they occur within a 14 hour duty day, IMO it doesn't state that there is a max 14 hour duty period.
 

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