VSI shows a very slight descent

[rob]

While studying for my instrument written today, I discovered that the VSI is not a required piece of equipment for IFR flight. The practice test question asks what to do if you discover that the VSI reads 100 feet low while at the airport. The given answer was "use 100 feet low as the level flight indication."  Interesting tidbit.

 

Yes, which is what I mentioned in the second post on this thread. 

[Immelman]

Many a time the compass fairy, or VSI gnome have made late night hangar visits and voila, problems like these are resolved.

 

The thing you don't want to do is document the problem and your fix, signing a return to service on something you are not authorized by the FAA man to do.