SDR ASAA2014012312478

Service difficulty report · Control Unit · Boeing 737890

Difficulty date: January 23, 2014
Submitted: January 27, 2014
Operation: Air carrier
Aircraft: N592AS
Make and model: Boeing 737890
Aircraft serial: 35190
Aircraft time: 23,227 hours, 7,239 cycles
System (JASC): 3040 · Windshield/Door Rain/Ice Removal
Part: Control Unit
Condition: Malfunctioned
Location: Window Heat
Stage of operation: TX
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

OVERHEAT INDICATION CAME ON FOR R2 WINDOW. ACFT GROUNDED. CONFIRMED. WINDOW VERY HOT. R2 WINDSHIELD HEAT CONTROL UNIT SHOWS SENSOR FAULT. SENSOR TESTED GOOD IAW MM 30-41-21. REPLACED WHCU AS A PRECAUTION. OPS CHECKED GOOD IAW MM 30-41-11. OPS CHECK R2 WINDOW HEAT GOOD IAW MM 30-41-00. REGULATES AROUND 108 DEG F. FAULT REPEATED. SWAPPED TO SECONDARY R2 WINDOW TEMP SENSOR AT WINDOW, IAW MM 30-41-21. OPS CHECK R2 WINDOW HEAT GOOD IAW MM 30-41-00. SYS TEST SAME GOOD REF MM 30-41-11.