Contamination led to Qeshm Fokker gear-up accident

Iranian investigators have determined that poor maintenance procedures, allowing contamination of hydraulic lines, led to a gear-up landing by a Qeshm Air Fokker 100 earlier this year. The aircraft had departed Tehran Mehrabad for Mashhad Feb 16 but, some 10nm from touchdown, its crew discovered problems with the left-hand main landing-gear. Several attempts to recycle the undercarriage were not successful. As it landed the aircraft veered off the left side of the runways suffering left wing structure and flap damage from ground contact. The landing-gear was also damaged. Examination of the hydraulic system has concluded that “foreign pollution” entered while C-check maintenance was being carried out on a restrictor valve and hose from the left-hand landing-gear actuator. <br/>