gōng / chéng / shī / tōng / guò / yí / qì / cè / liáng / fēi / jī / háng / xiàng / yǔ / shí / jì / háng / jì / zhī / jiān / de / piān / jiǎo工程师通过仪器测量飞机航向与实际航迹之间的偏角。The engineers used instruments to measure the angle between the aircraft's heading and its actual flight path.