Service difficulty report · Tube · Boeing 777222

Difficulty date
June 19, 2017
Submitted
June 19, 2017
Operation
Air carrier
Aircraft
N229UA
Make and model
Boeing 777222
Aircraft serial
30557
Aircraft time
66,492 hours, 7,805 cycles
Engine
Pwa PW4090
Part
Tube
Part number
50U66701
Condition
Cracked
Location
Nr 1 Engine
Stage of operation
CL
How discovered
O
Nature of condition
M, J
Precautionary procedure
A

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

What was found

LEFT ENGINE EGT AND N1 EXCEEDANCE ON TAKEOFF. FOUND AS126 SENSE TUBE CRACKED. REPLACED THE TUBE IAW FIGURE 604, MM 72-00-00-290-829-N02 FOR 4090 ENGINE N1 WAS AT 105 FOR .4 SECONDS THIS IS IN AREA A IAW E3A NO INSPECTION NEEDED. IAW 72-00-00-290-828-N02, SUBTASK 290-063-N02. COMPLETED HOT SECTION BORESCOPE INSPECTION OF COMBUSTION CHAMBER, FUEL NOZZLES, HPT 1ST-STAGE VANES AND BLADES. HPT 2ND-STAGE BLADES AND 3RD-STAGE BLADES AND VANES. AT THIS TIME FOUND NO LIMITING DEFECTS. IAW TASK 72-00-00-290-835-N02. TASK 72-00-00-290-836-N02. AND TASK 72-00-00-290-837-N02.