Service difficulty report · Intercostal · Boeing 747422

Difficulty date
March 6, 1999
Submitted
March 26, 2000
Operation
Air carrier
Aircraft
N171UA
Make and model
Boeing 747422
Aircraft serial
24322
Engine
Pwa PW4056
Part
Intercostal
Part number
141U8007502
Condition
Cracked
Location
Bs 322
Stage of operation
IN
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

AT APPROXIMATELY BODY STATION 322, THERE EXISTS A CRACK IN THE 141U8007-502 INTERCOSTAL. THE CRACK EXISTS IN THE LOWER HORIZONTAL FLANGE AND EXTENDS TO THE SECOND FASTENER HOLE COMMON TO THE 141U8007-501 SPLICE. *S/D* 141U8007-502 TRIMMED OUT AROUND CRACKED AREA. 141U8007-501 SPLICE STRAP EXTENDED TO PICK UP ADDITIONAL FASTENERS BEYOND CRACKED AREA. PART ROUTED TO BAC FOR ANALYSIS.