Service difficulty report · Strut · Boeing 777222

Difficulty date
March 29, 2011
Submitted
April 27, 2011
Operation
Air carrier
Aircraft
N781UA
Make and model
Boeing 777222
Aircraft serial
26945
Aircraft time
59,978 hours, 10,717 cycles
Engine
Pwa PW4077
Part
Strut
Condition
Cracked
Location
Nr 1 Engine
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

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

What was found

NR 1 ENG REAR TRANSITION AREA OUTER DUCT STRUTS 3 THROUGH 10 HAVE CIRCUMFERENTIAL CRACKS STRUT NR 3-.75, 4-.875,5-.625, 6-1.125, 7-.875, 8-1.125, 9-1.0, 0-.875. REF MM 72-54-01,PG. 605 THROUGH CRACKS ONE MAX PER EACH STRUT PERMITTED. MAX LENGTH 2 IN. REQUEST EG CONCURRENCE OF 600C VISUAL INSP INTERVAL. REF DISPOSITION LIMIT PAR (C) NR 1 SAME MM REF. CRACKS FOUND ON AK INSP. IN THE OUTER DUCT TRANSITION AREA AT THE REAR END OF THE STRUT. STRUTS 3-10 HAVE CIRCUMFERENTIAL CRACKS, STRUT (3) 0.75, (4) -0.875 (5) 0.625, (6)1.125, (7)0.875, (8)1.125,(9)1.0, 08489 (10) 0.875 INCH IN LENGTH. CRACKS ARE IN LIMITS PER MM72-54-01 G 605. THESE CRACKS WERE PREVIOUSLY COVERED BY CF624.