ACFT EQUIP PROB --JAMMED STABILIZER.

Narrative

WHILE ON DSCNT INTO CDG THE STABILIZER JAMMED AT 0 DEGS; CRUISE SETTING. ALL CHKLISTS WERE COMPLETED; ALL METHODS OF MOVING THE STABILIZER; MAIN AND CRUISE ELECTRIC AND MANUAL WOULD NOT BUDGE THE STABILIZER. THE PULLING OF THE BRAKE RELEASE WITH APPLICATION OF STABILIZER TRIM HAD NO EFFECT. AN EMER WAS DECLARED; EQUIP REQUESTED AND A LNDG ACCOMPLISHED. THIS ACFT HAS A HISTORY OF STABILIZER PROBS AND A SIMILAR PROB WAS DESCRIBED IN FEB/XX/95 WITH A NASA RPT. THE PROB; AS PER MAINT; IS THE AUX BRAKE; A NEW JACK SCREW ASSEMBLY WAS INSTALLED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: ACFT HAD PREVIOUS WRITE-UPS ON THE JAMMED STABILIZER AND THE RPTR HAD EVEN SENT AN ASRS RPT ABOUT IT PREVIOUSLY. IN THE PAST INSTANCES THE PLTS WERE ABLE TO RELEASE THE STABILIZER BRAKE; BUT NOT THIS TIME. THERE ARE 2 STABILIZER BRAKES; ONE CAN BE RELEASED WITH THE STABILIZER BRAKE RELEASE KNOB AND THE OTHER; WHICH IS ON THE JACK SCREW ASSEMBLY OPERATES DIFFERENTLY. THAT BRAKE IS APPLIED WHEN A RUNAWAY STABILIZER DEVELOPS AND THE CENTRIFUGAL SENSING MECHANISM APPLIES THE BRAKE. APPARENTLY; THE CENTRIFUGAL SENSING MALFUNCTIONED AND THE JACK SCREW ASSEMBLY BRAKE WAS APPLIED AND COULD NOT BE RELEASED BY THE FLC. SINCE THE MALFUNCTION OCCURRED IN CRUISE; THE STABILIZER JAMMED AT 0 DEGS. THE STABILIZER SETTING NORMALLY IS APPROX 5 DEGS NOSE UP FOR TKOF AND LNDG. CONSEQUENTLY; THE NOSE WAS VERY NOSE HVY FOR APCH AND LNDG AND; IN FACT; IN ORDER TO AID THE CAPT IN HOLDING THE NOSE UP; THE FO HAD HIS ARMS AROUND THE YOKE AND PULLING TO HELP KEEP IT UP. THE CAPT ALSO CARRIED EXTRA AIRSPD ON THE APCH TO ALSO HELP WITH THE NOSE POS. ON APCH TO CHARLES DE GAUL ARPT IN PARIS; THE RPTR DECLARED AN EMER AND ON APCH AT 1000 FT THE TWR CLRED AN ACFT ONTO THE RWY FOR TKOF. WHEN THE RPTR NOTIFIED THE TWR THAT THEY WERE AN EMER; THE TWR SAID; 'BE ADVISED WINDSHEAR RPTED.'