Incident Overview
On January 20, 2020, a Boeing 737-800 aircraft, registration SP-ESD, experienced a landing gear indication anomaly during approach to Larnaca Airport (LCLK), Cyprus. The crew performed a go-around and subsequently landed without further incident. The investigation did not identify a cause.
Sequence of Events
During the approach to Larnaca, the flight crew selected the landing gear lever to the DOWN position, initiating gear extension. At that moment, the aircraft was at an altitude of 2,981 feet above airfield level (AAL). While reading the landing checklist, the crew observed that the landing gear position indicator lights were illuminated red.
Due to the low altitude and aircraft position relative to the runway, the crew discontinued the descent at 855 feet AAL and executed a missed approach procedure. The captain informed air traffic control (ATC) of the reason for the abort and requested a visual inspection of the landing gear. ATC reported that the gear appeared to be extended.
During the go-around, the crew performed the “GEAR DISAGREE” procedure and conducted TODAR (Time, Options, Diagnosis, Assign/Decide, Review) and NITS (Nature of the problem, Intentions of the Flight Crew, Time available, Special circumstances/Signals/Suggestions) briefings with the cabin crew leader (CC1). The crew then advised ATC of their readiness for another approach and landing.
The second approach and landing were completed without any issues. During subsequent flights (16 flights up to the report date) the landing gear indications functioned normally. No fault information was found in the proximity switch electronic unit (PSEU) memory.
Outcome
The aircraft landed safely on the second approach. No injuries or damage were reported. The investigation did not establish a cause for the transient red gear indication.
Investigation
The Polish State Commission on Aircraft Accident Investigation (Państwowa Komisja Badania Wypadków Lotniczych) reviewed the final report submitted by the aircraft operator. The Commission concluded that the cause of the incident was not determined. No contributing circumstances or safety recommendations were identified.