Service difficulty report · Stringer · Bombdr DHC8402

Difficulty date
June 26, 2016
Submitted
June 29, 2016
Operation
Air carrier
Aircraft
N423QX
Make and model
Bombdr DHC8402
Aircraft serial
4153
Aircraft time
22,224 hours, 23,703 cycles
Part
Stringer
Condition
Corroded
Location
Fuselage
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

FRAME STA X401.0 TO STA X428.5, STR 24 EVIDENCE OF CORROSION. CORROSION REMOVAL FROM STR 24P IAW STRUCTURAL ID-02, PAR 2A BETWEEN FSX 401.0 TO FSX 428.5 HAS OVER HALF OF STR MATERIAL LOSS WITH CORROSION STILL PRESENT. REMOVED REMAINING CORROSION FROM STR 24P BETWEEN FSX 423.50 TO FSX 416.50 CORROSION REMOVAL WAS FROM VERTICAL LEG INSIDE LOWER RADIUS AND LOWER HORIZONTAL LEG OF STR 24P IAW SRM 51-21-00, STRUCTURAL ID-02, PAR 4A, ITEM 5A THRU 5D. USING DEPTH GAGE TUC-4745 AT DEEPEST POINT OF CORROSION REMOVAL ON STR 24P AT 125. X 421.50, .065 MATERIAL LOSS ORIGINAL MATERIAL THICKNESS AT STR 24P, VERTICAL LEG .080 LOWER HORIZONTAL LEG .110 IAW DWG: 85360021, REV H, SHT 19. REMOVE CORROSION FOUND BETWEEN FS X428.50 TO 423.50 AT STR 24P. BLENDED OUT CORROSION AT STR 24P FROM FSX 425.50-FSX 422.00 IAW SRM 51-21-00-00-02, BLENDED INTO RADIUS, HORIZONTAL AND VERTICAL LEG. C/W INSP, REF NDTM 51-00-06 + 51-00-04, NO DEFECTS NOTED MIN THICK=.046" ON LOWER HORIZONTAL SURFACE + .067" ON VERTICAL SURFACE. TREATED, PRIMED AND PAINTED REWORKED AREA, REF SRM 51-21-10-02-01, 51-25-10-02-01 AND 51-25-15-02-01.