What was found
AFTER ENGINE START, LINEMAN ADVISED HE NOTICED SPARKS AND BLACK SMOKE OCCASIONALLY COMING FROM APU EXHAUST. SHUTDOWN APU.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AFTER ENGINE START, LINEMAN ADVISED HE NOTICED SPARKS AND BLACK SMOKE OCCASIONALLY COMING FROM APU EXHAUST. SHUTDOWN APU.