B757-200
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 44; Flight Crew Total 2800; Flight Crew Type 24
Troubleshooting; Human-Machine Interface
Aircraft Equipment Problem Less Severe
Aircraft Aircraft Damaged; Flight Crew Overcame Equipment Problem
Aircraft
Event occurred during descent phase. Captain was the pilot monitoring; First Officer (F/O) was the pilot flying. Aircraft had sat for several days down for maintenance. [The maintenance airport] experienced heavy rainfall for an extended period prior to flight. Flight was uneventful until the descent phase of flight. At approximately FL220; the radar showed 'Weather (WX) FAIL' accompanied by a grinding noise; as if the radar was stuck on one side of the sweep. Radar was secured. At approximately 15;000 MSL and 325 knots in the descent; an additional loud bang and excessive airflow noise occurred; accompanied by multiple EICAS messages; including 'IAS DISAGREE.' Captain's side display was showing approximately 250 knots. F/O's side display was showing approximately 330 knots; which agreed with standby instrumentation. F/O called for 'AIRSPEED UNRELIABLE' checklist. The autopilot and autothrottles (A/T) were disengaged; and the A/T ARM switch was turned off. F/O continued flying manually throughout the remainder of the flight. Captain elected to leave the Flight Directors on; as the lateral guidance was still valid; we were VMC; and at that range we already had the field in sight. It was agreed that the F/O would disregard the pitch guidance until the instrumentation issue could be corrected. Captain continued running through the checklist from the QRH; it was determined that the F/O's instrumentation was valid; and the Captain selected the right side Air Data Compute (ADC). From that point forward; as we slowed to 250 knots; the airplane essentially flew normally. F/O continued to manually hand fly the descent and approach to an uneventful landing. After inspection; the aircraft was taxied back normally. On post-flight inspection; the radome had a large structural failure; which likely caused an asymmetric airflow disruption which affected the Captain's instrumentation.
B757 First Officer reported multiple system anomalies resulted from the inflight structural failure of the radome.