Standby Regulations
Standby ends when the crew member reports for duty. This moment is your FDP reference time.
If standby ends within the first 6 hours (8 hours if inflight rest applies), the maximum FDP counts from reporting. There is no reduction of FDP.
If standby ends after the first 6 hours (8 hours if inflight rest applies), the maximum FDP is reduced by the amount of standby time exceeding 6 or 8 hours.
If standby starts between 23:00 and 07:00, the time between 23:00 and 07:00 does not count toward the reduction of the FDP until the crew member is contacted by OCC. In other words, standby while sleeping does not reduce FDP.
The combination of standby and FDP may not result in more than 18 hours awake. However, when inflight rest is planned during the flight duty period, the 18-hour awake limit does not apply. If standby and FDP together exceed 18 hours, and no inflight rest is planned, OCC will verify with the crew member if he or she has been asleep during the standby period and will act accordingly.
Refer to OM-A 7.1.10 for the official policy.
Example: Standby 06:00-12:00.
Called at 11:30 for a two-crew flight. Duty starts at 13:00.
Standby time exceeding 6 hours: 13:00-12:00 = 1:00.
The maximum FDP is reduced by this exceedance.