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SDR CA150213003

Open the Markdown

Service difficulty report · Hose · Boeing 737

FAA SDR system

Difficulty date
February 12, 2015
Submitted
March 12, 2015
Operation
General aviation
Make and model
Boeing 737
Aircraft time
7,554 hours
Engine
Cfmint CFM567B27E
System (JASC)
3610 · Pneumatic Distribution System
Part
Hose
Part number
242034410150
Condition
Failed
Location
Pneumatic Sys
Stage of operation
DE
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

(CAN) AT TOP OF DESCENT THE PRESSURIZATION AUTO FAIL LIGHT ILLUMINATED FOLLOWED BY THE ALTERNATE LIGHT. THE QRC DIRECTED THE FLIGHT CREW TO SWITCH TO ALTERNATE MODE. APPROXIMATELY 30 SECONDS LATER THE AUTO FAIL LIGHT ILLUMINATED AGAIN. THE CREW HAD TO CONTROL THE CABIN PRESSURE MANUALLY. MAINTENANCE FOUND THAT A WATER LINE HAD BROKEN AND FLOODED THE AREA AROUND THE OUTFLOW VALVE CAUSING A SIGNIFICANT AMOUNT OF ICE TO BUILD UP AND PREVENT NORMAL OPERATION OF THE OUTFLOW VALVE. THE OUTFLOW VALVE AND THE LINE WERE REPLACED. (TC# 20150213003)