AN AVRO RJ-85; DURING TAXIING IN TO A GATE; LOST ALL MODES OF BRAKING AND #1 ENG STRUCK THE JETBRIDGE INCURRING MAJOR DAMAGE TO #1 ENG.

Narrative

UPON ARR INTO ZZZ AND BACK ON OCT/TUE/02; FLC SQUAWKED MULTIPLE ENG AIR PROBS ON ACFT. AFTER ARRIVING TO ACFT TO INVESTIGATE; MYSELF AND FELLOW MECH DECIDED IN ORDER TO PROPERLY TEST SYS; IT WOULD REQUIRE ENG RUNS AT DIFFERENT PWR SETTINGS. WE WERE GIVEN CLRNC BY ZZZ GND TO PUSH OUT OF GATE AND PROCEED SBOUND ON TXWY J TO ENG RUN-UP AREA. DURING TAXI TO RUN-UP AREA; NOTED NO DISCREPANCIES WITH ACFT BRAKING SYS. COMPLETED OUT TESTING OF THE #1 AND #2 ENG AIR SYS. ASKED ZZZ GND FOR CLRNC TO REPOS BACK TO GATE. TAXIED ACFT NBOUND ON TXWY J. BEGAN APPLYING BRAKES AT THE INTXN OF TXWY J AND TXWY T. BRAKES WORKED NORMALLY AND ACFT BEGAN TO SLOW DOWN; PWR LEVERS WERE BACK AT IDLE. REAPPLIED BRAKES AT SPOT #1 AND BRAKES FELT NORMAL AT THIS TIME. APCHED GATE; TURNED NOSE IN DIRECTION AT GATE. APPLIED BRAKES WITH INTENT TO STOP. BRAKES DID NOT RESPOND. TOLD CO-WORKER BRAKES WERE NOT RESPONDING. AT THAT POINT; HE APPLIED BRAKES FROM THE R SEAT WITH NO RESPONSE. CHKED YELLOW BRAKE PRESSURE INDICATOR FOR PRESSURE; NONE WAS PRESENT. CHKED OVERHEAD TO ENSURE PUMPS (ENGS #2 AND #3; AC AND PTU) WERE OPERATING NORMALLY. NOTED NO ABNORMALITIES NOR WERE ANY INDICATION FAILURES PRESENT. CYCLED FROM YELLOW TO GREEN; BACK TO YELLOW HYDS WHILE CONTINUING TO APPLY BRAKES. BRAKES WERE STILL NOT RESPONDING; SO I SWITCHED TO EMER YELLOW HYDS. JUST PRIOR TO IMPACT; COULD NOT TELL IF SWITCHING TO EMER YELLOW WAS EFFECTIVE; AS THE IMPACT OF THE ACFT INTO THE JETBRIDGE KNOCKED ME TO THE R SIDE OF THE SEAT INTO THE CTR CONSOLE. IMMEDIATELY AFTER IMPACT; ATTEMPTED TO SHUT OFF ALL ENGS. ENGS #2; #3 AND #4 SHUT DOWN NORMALLY WITH THRUST LEVERS. PWR LEVER ON #1 ENG WAS BINDING DUE TO ENG DAMAGE AND WOULD NOT STOP ENG OP. FIRE HANDLE WAS PULLED AND EVENTUALLY TERMINATED #1 ENG. ACFT SUFFERED EXTENSIVE DAMAGE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED AFTER THE INCIDENT; THE CARRIER SENT SEVERAL ELECTRONICS TECHNICIANS INTO THE STATION TO CHK THE ANTISKID SYS. THE RPTR SAID A CONNECTOR IN THE ANTISKID AND BRAKE SYS WAS FOUND WITH SEVERAL PUSHED BACK PINS AND WAS DETERMINED TO BE THE CAUSE OF THE ANTISKID AND BRAKE FAILURE. THE RPTR STATED THE AIRPLANE #1 ENG AND PYLON WAS JUST ABOUT RIPPED FROM THE WING AND NO DECISION HAS BEEN MADE TO REPAIR OR JUNK THE AIRPLANE. THE RPTR SAID WHEN THE PUSHED BACK PINS WERE DISCOVERED; AN FAA INSPECTOR WAS PRESENT AND OBSERVED THE CONNECTOR. THE RPTR STATED NO HEARING HAS BEEN HELD AND HE IS STILL BEING HELD OTS. THE RPTR SAID THE FAA HAS NOT CONTACTED THE RPTR. THE RPTR STATED A PREVIOUS INCIDENT OF BRAKE FAILURE OCCURRED ON ANOTHER CARRIER OPERATING AN AVRO RJ-85 ACFT ON TAXI IN TO A GATE; STRIKING THE TERMINAL; BUT THE MODE OF BRAKE FAILURE IS UNKNOWN.