Piper seminole Hobbs meter?

If it runs of the right engine then all you need to do is take off with both and shut one down in flight and be billed for .4

I didn't build it, call piper.
 
bLizZuE said:
If it runs of the right engine then all you need to do is take off with both and shut one down in flight and be billed for .4

I didn't build it, call piper.
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I know our frasca sims here at UND run off the battery master but im pretty sure the planes do not. We fly 2000-2006 seminoles and I have been told by a mechanic and by several instructors now that it runs off right engine oil pressure. Its probably different for each operator. Im going to test it on monday to find out for sure.
 
Cessnaflyer said:
Most hobbs meters start when you flip the battery switch. All they do is count when electricity is flowing.
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Wrong.

The seminoles hobbs are powered by oil pressure from either engine (at least in both of the ones I fly.)

There aren't any hobbs that I am aware of that use the master switch. Imagine how much 'time' would be on a plane after a visit to the shot to trouble shoot a mx problem.

There are a few twins that have 'air hobbs'. these start counting when the gear goes up. now that is cool stuff.
 
If I recall correctly the ATP seminoles have 2 hobbs meters -- one that shows off/on and one that shows "block" (for lack of a better word.) The off/on hobbs is for maintenance purposes and is operated by a squat switch. The block/billing hobbs is operated anytime the master switch is on. However, this is a modification ATP does to their seminoles and they dont come from the factory like this.
 
I tested this out yesterday and for our seminoles it runs off of right engine oil pressure. We shut down the right engine and I started my stopwatch, we flew for about 8:30 and hobbs didnt click over. Once I started the engine, not more than a minute later it clicked over and I was 30 dollars poorer.:mad:
 
Nice to know you did the test.

For ATP, how do you log the time? Do you use the time from the 'air' hobbs or from the one power by the master switch?
 
ppragman said:
You can install off of a little hole in the wing. It starts to click away when you reach 60kts or what ever its calibrated at. This is good for maintenance because it essentially cuts .1 - .2 off of every flight if you're at a big airport.
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Maintenance runs off of Tach time. Because it's only accurate in cruise flight, the Hobbs meter was added to track flight time.

Codyjp said:
There aren't any hobbs that I am aware of that use the master switch. Imagine how much 'time' would be on a plane after a visit to the shot to trouble shoot a mx problem.
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My Seneca had a Hobbs meter tied to the master. A renter left the master on all night and the time meter counting. That was one heck of a 12 hr flight!

Before you ask, no, I didn't charge him for 12 hrs.
 
JulietBravo said:
In the seminole I flew (1989), it was off the oil pressure. I believe it was the right system. On the other hand, the Aztec I'm flying starts the hobbs when the gear doors close.
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Its actually (most likely) a squat switch that starts the time as soon as the wheels are unweighted. I could be wrong, but Ive seen that a lot.
 
Regardless if the hobbs is connected to the battery master or not, (like it is on the 1979 seminole I fly) there are tachometers on each engine. With the Tachs are Tach time meters. I think your flight school would notice a ton of tach time used and no hobbs.
 
ATP's Seminoles (and Cessna's) Hobbs in/out time run off battery master that I'm aware of. Every instance that a student leaves on a master switch by accident, not only is the battery dead, but we have to account for the 8 hours (or so) of time on the meter thats unaccounted for while the switch was on until the battery went dead. And the fact that I have seen them flip several times during the before start checklist before the first engine start. The two Hobbs setup in ATP's Seminoles are not factory installed, we have recieved new planes that had to have the two Hobbs meters installed after we recieved them so we could log on/off times.
 
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