flight test requierment after maintenance& or repair on A/c weighing upto 5700 kg on both single &twin engine?

Question

with reference.

Answer 1

That would depend on what country you're in, and what their regulations state.

For the United States, FAR Part 91.407 states (in part):

"(b) No person may carry any person (other than crewmembers) in an aircraft that has been maintained, rebuilt, or altered in a manner that may have appreciably changed its flight characteristics or substantially affected its operation in flight until an appropriately rated pilot with at least a private pilot certificate flies the aircraft, makes an operational check of the maintenance performed or alteration made, and logs the flight in the aircraft records.

(c) The aircraft does not have to be flown as required by paragraph (b) of this section if, prior to flight, ground tests, inspection, or both show conclusively that the maintenance, preventive maintenance, rebuilding, or alteration has not appreciably changed the flight characteristics or substantially affected the flight operation of the aircraft."

There is no difference between singles or twins in this requirement.

Answer 2

After maintenance or repair any pilot rated in the aircraft can flight test the aircraft and sign the logbook to return it to service. I have done it several times for minor repairs, but when the engine was overhauled, I left that to the mechanic who worked on it.