N90XR

ATA 2710

Part: SEAL — FROZEN (AILERON) · airframe 5,210 hrs · 4,424 cycles

FLEW TO KLUK ABOUT 0700. A/C SAT ON THE RAMP UNTIL ABOUT 1530, ABOUT WHICH TIME WE DEPARTED FOR KGRR. APPROX 10 MINUTES INTO OUR FLIGHT APPROACHING FL250 WITH A CLEARANCE TO CLIMB HIGHER. ABOUT THIS TIME AND ALTITUDE, WE RECEIVED AN AMBER AP AIL MISTRIM EICAS MESSAGE TO WHICH THE 1ST OFFICER RESPONDED TO BY HOLDING THE CONTROLS AND DISCONNECTING THE AUTO PILOT. AT THAT TIME, HE SAID THAT HE WAS UNABLE TO CONTROL AIRCRAFT ROLL NORMALLY, DUE TO THE AILERONS BEING JAMMED OR FROZEN. CAPTAIN THEN TOOK CONTROL OF THE AIRCRAFT, CONTROLLED IT WITH RUDDER AND THRUST INITIALLY (MOSTLY RUDDER, WHICH WORKED GREAT), AND THEN PULLED THE ROLL DISC LEVER PER THE AFM. FOR SEVERAL REASONS, WE DECLARED AN EMERGENCY, RAN ALL THE APPROPRIATE CHECKLISTS FOR THIS CONDITION AND LANDED UNEVENTFULLY IN KGRR. THE WEATHER CONDITIONS IN KLUK FOR AT LEAST THE PREVIOUS FEW HOURS BEFORE OUR DEPARTURE INCLUDED LOW CEILINGS, NON-FROZEN PRECIPITATE AND TEMPERATURES APPROXIMATELY IN THE HIGH 40’S TO LOW 50’S FAHRENHEIT. OUR CLIMB OUT WAS ALMOST ALL IN IMC CONDITIONS AND IN LIGHT, NON-CONVECTIVE PRECIPITATION AND THE TEMPERATURES AT 25,000’ MSL WERE ABOUT -30 C.STS FOR THIS CONDITION AND LANDED UNEVENTFULLY IN KGRR.

ATA 2710

Part: SEAL — LACK OF LUBE (AILERON) · airframe 4,768 hrs · 4,029 cycles

AIRCRAFT WAS CLIMBING THROUGH FL380, THE CREW GOT AN AMBER AP AIL MISTRIM CAS MSG. AUTOPILOT WAS DISENGAGED TO FIND THAT THEY HAD NO AILERON CONTROL. CONTROL WHEEL WOULD NOT MOVE FROM THE CTR POSITION. PERFORMED ROLL DISCONNECT, WAS ABLE TO CONTROL ACFT & LANDED. AFTER ACFT SHUTDOWN, THE CREW LET ABOUT 10 MIN GO BY, AT WHICH POINT THEY RE-ENGAGED ROLL DISCONNECT & THE CONTROL WHEEL & AILERON CONTROL OPERATED NORMALLY. INSPECTED AILERON SYS WITH NO CABLE OR TRAVEL DEFECTS NOTED. THEY NOTED AILERON BRUSH SEALS WERE DRY & SHOULD BE LUBED. DRY BRUSHES ALONG WITH THE RAIN STORM FROM THE PREVIOUS DAY CAUSED THE BRUSHES TO HOLD WATER & UPON CLIMB OUT THEY FROZE TO THE AILERON. THE FREQUENCY OF BRUSH SEAL LUBE IS NOW AT 12MTHS. THEY WERE BEING LUBED EVERY 300HRS.

ATA 2910

Part: LINE — CHAFED (HYDRAULIC SYS) · airframe 342 hrs · 290 cycles

DURING CRUSE FLIGHT THE PILOTS NOTED THAT MAIN HYDRAULIC SYSTEM LOST PRESSURE. INITIATED AN UNSCHEDULED LANDING. AFTER INSPECTION, THE LT ENGINE DRIVEN HYDRAULIC PRESSURE PUMP LINE WAS LEAKING. THE PRESSURE LINE AND BOTH HYDRAULIC PUMPS WERE REPLACED, WITH NEW PARTS, IAW THE MM.