The Polish State Commission for Investigation of Air Accidents released an initial investigation report detailing the gear-up landing of a LOT Polish Airlines Boeing 767 on November 1.
The airplane operated on a regular passenger flight from Newark (EWR), USA to Warsaw (WAW), Poland. After take off, while retracting the landing gear and flaps hydraulic fluid began to leak from the central hydraulic system (installation “C”), what consequently led to pressure drop in this installation. After completing the QRH procedure and consultation with the operator’s operations centre, the flight crew decided to continue the flight to Warsaw.
During approach for landing at Warsaw the flight crew performed the QRH procedure which was connected with using the alternate landing gear extension system. The landing gear did not come down. A holding pattern was entered while the crew tried to lower the gear in the gravitational way, which was also unsuccessful. A Polish Air Force F-16 fighter flew by and confirmed the gear was up. Because the airplane was getting low on fuel, a safe emergency gear-up landing was carried out.
Initial investigation results indicate that on the P6 panel on the flight deck, the circuit breaker C829 BAT BUS DISTR (on A1 position) was in the position „Off”, while the circuit breaker C4248 LANDING GEAR – ALTN EXT MOTOR (on F6 position) was in the position „On”.
The circuit breaker C829 (BAT BUS DISTR) indicated on Photo 5 protects several airplane systems including the alternate landing gear extension system. The „Off” position of the circuit breaker was not recorded or indicated by the airplane systems (FDR – Flight Data Recorder and EICAS – Engine Indications and Crew Alerting System).
After connecting the ground power unit, setting C829 (A1) BAT BUS DISTR circuit breaker in the position „On” and activation of the alternate landing gear extension system, the landing gear was extended and the airplane was recovered.
- Report SCAAI-1400/2011-EPWA-SP-LPC (rev.1) (PDF)