Service difficulty report · Control Unit · Boeing 737890

Difficulty date
May 30, 2020
Submitted
June 2, 2020
Operation
Air carrier
Aircraft
N593AS
Make and model
Boeing 737890
Aircraft serial
35107
Aircraft time
45,981 hours, 13,814 cycles
Part
Control Unit
Part number
8300005604
Part serial
12243D
Condition
Failed
Location
Cockpit
Part time
45,981 hours, 13,814 cycles
Stage of operation
NR
How discovered
O
Nature of condition
B
Precautionary procedure
O

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

What was found

NUMBER 1 RT FWD WINDSCREEN IS CRACKED. WINDOW STARTED ARCING INTERNALLY AT UPPER INTERNAL WINDOW, HEAT POWER BAR OB CONTACT FOLLOWED BY OH. TURNED WINDOW HEAT OFF. WHCU-LRU & WINDOW POWER FAULTS SHOWED ON LAST 3 CYCLES. REPLACED R1 WINDOW HEAT CONTROL UNIT IAW AMM 30-41-11. PERFORMED ELEC RESISTANCE CHECK OF WINDOW FILM IAW AMM 30-41-21. OPS CHECK GOOD. REPLACED RT NR 1 WINDOW IAW AMM 56-11-11. PERFORMED CABIN PRESSURE LEAK CHECK IAW AMM 05-51-91, NO LEAKS.