Service difficulty report · Housing · Boeing 737

Difficulty date
April 30, 2001
Submitted
June 5, 2001
Operation
Air carrier
Make and model
Boeing 737
Part
Housing
Part number
511531
Condition
Cracked
Location
Shuttle Valve
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

HOUSING IS CRACKED INSIDE THE MOUNTING HOLE ALONG THE CASTING SEAM. PROBABLE CAUSE: FATIGUE, DEFECT IN THE CASTING OF THE HOUSING AND/OR OVER TORQUED BOLTS ON INSTALLATION.