The report, published last Thursday, May 6, states in part
that "According to the FAA licensed A & P mechanic who oversaw
and supervised the engine change, he did not sign off any
maintenance records to return the airplane to an airworthy status."
The engine being swapped was an Avon 122 made by Rolls-Royce. It
continues to say that the mechanic "...conducted the engine change
in accordance with maintenance manuals for the airplane. He
supplied a copy of the documentation used during the engine change
and subsequent engine runs which showed what was conducted."
"He also reported that
during engine runs, the engine was found to not meet two specific
tests. The first test was engine acceleration from approach power
(4,500 rpm) to maximum governed rpm (8,100 rpm). The specified time
for the acceleration was 5 seconds, and he reported that it took
the engine 9 seconds to complete the acceleration. The second test
was engine acceleration from ground idle to the maximum governed
rpm. The specified time for the acceleration was 7 to 9 seconds,
and he reported that it took 14 seconds to complete the
Additionally, the investigation found that there was no record
of an application on the part of the pilot/owner for a special
permit to fly the aircraft.
The NTSB has not yet issued a final report for this