Occurrence
On 11 June 2017, at LEPA (Palma de Mallorca Airport), a Boeing 737-800 (B738) was on final approach. During the landing configuration setup, the crew moved the flap lever from 15 to 30 degrees. However, the actual flap extension only reached 25 degrees as indicated on the gauge. Shortly after, a 'TOO LOW FLAPS' warning message was generated.
Crew Response
The crew responded by setting the FLAP INHIBIT switch to the FLAP INHIBIT position, silencing the warning. They disregarded the alert and continued the approach using an increased VREF (reference speed). The landing was completed without any further incidents and without injuries or damage.
Post-Flight Actions
After landing, the flap system was tested and found to be functioning normally. The training department conducted a disciplinary discussion with the crew, emphasizing that a go-around (G/A) and the appropriate non-normal checklist (NNC) for TRAILING EDGE FLAPS DISAGREE should have been performed.
Probable Cause
The investigation determined that the incident was caused by non-compliance with approach to landing procedures.