| GENERAL CHARACTERISTICS ITEM DESCRIPTION | BRAZE ASSEMBLY: BRAZE AND SOLUTION TREAT AT 1875 DEGREES FAHRENHEIT (+ OR - 25 DEGREES) FOR 8 HOURS; AGE IN VACUUM OR AIR ATMOSPHERE FURNACE AT 1325F (+ OR - 25) FOR 8 HOURS; FURNACE COOL TO 1150F (+ OR - 15) AT 100 F/HOUR; HOLD AT 1150F, (+ OR - 15F) FOR 8 HOURS; COOL AT A RATE EQUAL TO AIR COOL OR FASTER |
| SPECIAL FEATURES | HARDNESS TO BE ROCKWELL COLLINS 35-48 ON AIRFOILS AND TO BE CHECKED BY SAMPLE VANE PROCESSED ALONG WITH ASSEMBLY THROUGH BRAZING AND HEAT TREAT CYCLE |
| SPECIAL TEST FEATURES | FLOURESCENT PENETRANT INSPECT PER P3T52 CL-C IMPERFECTIONS AS CRACKS, VOIDS, POROSITY ARE ACCEPTABLE WITHIN THE FOLLOWING LIMITS: (1) NO CRACKS OR FOLDS ALLOWED, (2) NO OTHER IMPERFECTIONS ALLOWED EXCEPT THOSE PERMITTED IN PART SPECIFICATION C50T1063; BRAZED JOINTS RAILS AND VANES: INDIVIDUAL IMPERFECTIONS .020 OR SMALL SHALL NOT BE CONSIDERED; MAXIMUM LENGTH OF IMPERFECTINOS: .03"; CUMULATIVE LENGTH OF IMPERFECTIONS IN ANY .25" SHALL NOT EXCEED .045"; (3)CUMULATIVE LENGTH OF IMPERFECTIONS IN ANY JOINT SHALL NOT EXCEED 5% OF JOINT LENGTH; (4) MINIMUM DISTANCE BETWEEN IMPERFECTIONS: .03" |
| SUPPLEMENTARY FEATURES | SURFACES BETWEEN AIRFOIL SECTIONS MUST BLEND TO FORM A SMOOTH CONTOUR THROUGHOUT THE FULL LENGTH OF THE VANE; RAII AT LEADING AND TRAILING EDGES MUST BLEND SMOOTHLY WITH AIRFOIL CONTOURS |