Service difficulty report · Relay · Boeing 777222

Difficulty date
February 4, 2013
Submitted
February 15, 2013
Operation
Air carrier
Aircraft
N777UA
Make and model
Boeing 777222
Aircraft serial
26916
Aircraft time
72,243 hours, 12,967 cycles
Engine
Pwa PW4077
Part
Relay
Part serial
K30315
Condition
Failed
Location
Pitot Heat
Stage of operation
CL
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

AFTER TAKE OFF, FOUND PROBE HEATER RELAY K30315-K30316 AND SENSOR HEATER K30223 AT FAULT IN PITOT PROBE HEATER SYS CONTROLLER. SWAPPED RELAYS FROM RT PROBE HEATER SYS WITH RELAYS FROM CONTROLLER SYS. RT PROBE HEATER SYS INOPERATIVE. REPLACED RELAYS K30313, K30314 AND K30220 REF WDM 30-31-12. RIGHT AOA AND PROBE HEAT SYSTEMS, OPS CHECKED GOOD.