As a piston pilot I am only familiar with tracking hours for my pilot log book and maintenance log book using the Hobbs and Tach times. Can someone tell me what the equivalent is for a Turbine and for a Jet?

  • 2
    $\begingroup$ We used clock time to track Metroliners and hobbs to track a Turbo Commander. I think hobbs is acceptable if installed. $\endgroup$
    – acpilot
    Jul 6, 2017 at 16:02
  • $\begingroup$ Related $\endgroup$
    – Pondlife
    Jul 6, 2017 at 17:27
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    $\begingroup$ Any installed time tracking system will be acceptable for logging maintenance times. Under FAA regulations, mechanical or electrical time tracking systems in aircraft generally do not keep track of "flight time" which is what is to be logged or kept track of. See 14 CFR 1.1 In the turbine I fly we log time based on block to block time, which is the same as FAA defined flight time in our case. $\endgroup$
    – J W
    Jul 7, 2017 at 2:38

1 Answer 1


In all of our jets, we have two hobbs meters. One is active from left engine start and the other goes active when the weight of the aircraft leaves the wheels. Neither of these are used for logging our flight time. We do that "chock-to-chock", ie as soon as the chocks are pulled and we start moving to when the chocks are put back in the wheels.

The regs say you can log flight time from when "the aircraft moves under it's own power for the purpose of flight":

Flight time means:
(1) Pilot time that commences when an aircraft moves under its own power for the purpose of flight and ends when the aircraft comes to rest after landing; or
(2) For a glider without self-launch capability, pilot time that commences when the glider is towed for the purpose of flight and ends when the glider comes to rest after landing.

  • $\begingroup$ Which of those measures are used to track total time for maintenance purposes (e.g. phase inspections etc.)? $\endgroup$
    – ra9r
    Jun 4, 2018 at 19:16
  • $\begingroup$ We use WOW for all maintenance. $\endgroup$
    – Richard
    Jun 5, 2018 at 20:51
  • $\begingroup$ I'm sorry for my ignorance, what does WOW stand for? $\endgroup$
    – ra9r
    Jun 9, 2018 at 18:03
  • 1
    $\begingroup$ Sorry about that - it stands for Weight on Wheels. $\endgroup$
    – Richard
    Jun 11, 2018 at 15:21

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