Event Description
On 19 February 2016, shortly after takeoff from Warsaw Chopin Airport (EPWA), the EICAS display of an Embraer 170-200 showed a SLAT FAIL warning. The slat position indicated 3 and the flap position indicated 2. The flight crew performed the procedures specified in the SLAT FAILURE checklist and leveled off at 6,000 feet. They decided to return to the departure airport and completed a landing with slats set to position 3 and flaps set to position 5.
Findings
Following the landing, the aircraft was handed over to maintenance personnel. Inspection of the slat electrical wiring bundles revealed damage to the following components:
- Left outboard skew harness (P/N 171-13509-401)
- Right outboard skew harness (P/N 171-13508-401)
- Left outboard skew sensor (P/N 1716280A, S/N OFF/ON L5699/L6845)
- Right outboard skew sensor (P/N 1716282A, S/N OFF/ON R6982/R5763)
Repairs were performed in accordance with Aircraft Maintenance Manual (AMM) tasks 27-83-01 and 27-83-07. Multiple post-repair tests yielded positive results, and the aircraft was returned to service.
Status
A total of 64 occupants were on board; none reported injuries. The event was classified as an incident. The investigation was supervised by Edward Łojek and conducted by the operator. No safety recommendations were issued.
Probable Cause
The investigation determined the cause of the incident to be a malfunction of the electrical wiring for slat position control.