Service difficulty report · Crease Beam · Boeing 7572Q8

Difficulty date
September 12, 2015
Submitted
September 15, 2015
Operation
Air carrier
Aircraft
N393BC
Make and model
Boeing 7572Q8
Aircraft serial
33960
Aircraft time
29,601 hours, 17,657 cycles
Part
Crease Beam
Condition
Corroded
Location
Bs 729-740
Stage of operation
IN
How discovered
9
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

MAIN CABIN-CORROSION ON RT INNER CREASE CHORD BETWEEN BS 729.6 AND BS 740, RBL 65. REMOVED CORROSION AT RT INNER CREASE BEAM BETWEEN BS 729-740, RBL 65, MATERIAL ORIGINAL THICKNESS .080", MATERIAL LOSS .051", FOUND OUT OF LIMITS IAW SRM 53-60-13, FIG 101, DETAIL III ALLOWABLE DAMAGE 1, W=0.50", L=0.50", D=0.051". R & R RT INNER CREASE BEAM CHORD FROM BS 664-, BS 756, RBL 65 IAW SRM 51-40-02, FIG 4, PG 20, PG 6. PARA 7.D AND DWG 143N8322.

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