Service difficulty report · Rib · Boeing 747238B

Difficulty date
October 24, 1999
Submitted
March 26, 2000
Operation
Air carrier
Aircraft
N158UA
Make and model
Boeing 747238B
Aircraft serial
21054
Engine
Pwa JT9D7J
Part
Rib
Condition
Cracked
Location
Nr 4 Strut
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

DURING INSPECTION OF THE OUTBOARD STRUTS RIBS (OUTBOARD AND INBOARD) AT NAC STA 236.5, THE OUTBOARD RIB ON STRUT NR 4 WAS FOUND CRACKED UNDERNEATH THE 65B90150-3 BRACKET. THE APPROXIMATE LENGTH OF THE CRACK IS 6 INCHES. ALSO, THE BRACKET WAS FOUND CRACKED. (P/N 65B90308-3) RIB. ALSO, ON THE NR 1 AND NR 4 STRUTS INBOARD RIBS, THE BRACKETS WERE FOUND CRACKED.