Hobbs Meter

SpinAware

Member
I flew with a student on C-172 airplane yesterday.

We completed a x-country flight with exactly 50 nmiles (to & fro) at about 95 Kts. The entire flight was at low altitude enroute and calm wind condition. At the end of the air-exercise, the hobbs meter shows 2.4hrs! o_O This is the first time, I've encountered such a hobbs meter running faster than usual! :ooh:

Side-story...

The flight school is not doing well and has about 3 foreign students pathetically. The school has eight airplanes, six are to be scrapped but only two (one C172 & one C152) are serviceable. The school owner is greedy and tried to scam the students. And there are many stories to share ...

Nonetheless, I have a technical query for the A&P Mechanic/Technician - I highly suspected the hobbs meter is manipulated. Is that possible? :rolleyes:
 
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I flew with a student on C-172 airplane yesterday.

We completed a x-country flight with exactly 50 nmiles (to & fro) at about 95 Kts. The entire flight was at low altitude enroute and calm wind condition. At the end of the air-exercise, the hobbs meter shows 2.4hrs! o_O This is the first time, I've encountered such a hobbs meter running faster than usual! :ooh:

Side-story...

The flight school is not doing well and has about 3 foreign students pathetically. The school has eight airplanes, six are to be scrapped but only two (one C172 & one C152) are serviceable. The school owner is greedy and tried to scam the students. And there are many stories to share ...

Nonetheless, I have a technical query for the A&P Mechanic/Technician - I highly suspected the hobbs meter is manipulated. Is that possible? :rolleyes:

I once worked at a place that had a switch to deactivate the Hobbs, coincidentally it would always be flipped after the owner flew it. So I wouldn't be surprised if the opposite was true.
 
I have never heard of a Hobbs running faster than usual.

I have seen them running when they shouldn’t be for various reasons, and I have seen them accumulate time during maintenance because of how they are designed.
 
I don't know of any way to get the Hobbs to turn faster other than perhaps a 12 v Hobbs in a 24 volt airplane. Was it a new Hobbs?

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I have never heard of a Hobbs running faster than usual.

I have seen them running when they shouldn’t be for various reasons, and I have seen them accumulate time during maintenance because of how they are designed.

One of the airplanes in the fleet I work with had a major disparity between the Hobbs and the tach last summer (like, huge) but I can't remember which one the problem was - I think the tach was the problem.
 
One of the airplanes in the fleet I work with had a major disparity between the Hobbs and the tach last summer (like, huge) but I can't remember which one the problem was - I think the tach was the problem.
Yeah, that would make sense.
 
One of the airplanes in the fleet I work with had a major disparity between the Hobbs and the tach last summer (like, huge) but I can't remember which one the problem was - I think the tach was the problem.
Tach runs faster or slower based on engine RPM

1:1 is usually 2500

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That's what I thought too, couldn't remember.

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I think the ones I’ve installed/replaced have all been. But it’s been a while so I could be wrong.

Side note, whenever I installed an air Hobbs, I would use an in-line fuse behind the panel for circuit protection. Want to disable the Hobbs? Great, hope you enjoy flying with the master off.
 
One of the airplanes in the fleet I work with had a major disparity between the Hobbs and the tach last summer (like, huge) but I can't remember which one the problem was - I think the tach was the problem.
Student pays according to Hobbs time. So, Hobbs meter reading mean alot.
Usually, tach time, we don't care. So long, it it within 100hrs.
 
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