What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Narrative: shortly after takeoff power was applied, crew noted smoke in cockpit and smoke alarms in lavatories sounded. Crew selected single pack operation but neither left nor right pack cleared the smoke. Crew depressurized at 500' and returned to Portland. No evacuation. Maintenance identified the APU as source of smoke. Removed and replaced APU. Replaced socks in air conditioning units. Aircraft returned to service. Internal failure in APU unknown until teardown complete. No fire was apparent. This report is closed.
As the FAA filed it
NARRATIVE: SHORTLY AFTER TAKEOFF POWER WAS APPLIED, CREW NOTED SMOKE IN COCKPIT AND SMOKE ALARMS IN LAVATORIES SOUNDED. CREW SELECTED SINGLE PACK OPERATION BUT NEITHER LEFT NOR RIGHT PACK CLEARED THE SMOKE. CREW DEPRESSURIZED AT 500' AND RETURNED TO PORTLAND. NO EVACUATION. MAINTENANCE IDENTIFIED THE APU AS SOURCE OF SMOKE. REMOVED AND REPLACED APU. REPLACED SOCKS IN AIR CONDITIONING UNITS. AIRCRAFT RETURNED TO SERVICE. INTERNAL FAILURE IN APU UNKNOWN UNTIL TEARDOWN COMPLETE. NO FIRE WAS APPARENT. THIS REPORT IS CLOSED.
Other reports on N937AS · 2
Matched to the same aircraft by N-number and date.