Service difficulty report · Doubler · Boeing 7377H4

Difficulty date
March 16, 2022
Submitted
April 7, 2022
Operation
Air carrier
Aircraft
N240WN
Make and model
Boeing 7377H4
Aircraft serial
32503
Aircraft time
53,442 hours, 31,881 cycles
Part
Doubler
Condition
Cracked
Location
Bulkhead
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

RIGHT WHEEL WELL FWD BULKHEAD WEB BY EXHAUST BETWEEN RBL 15' AND RBL 25' I/B HOLE CRACKED / [01] FABRICATED NEW RIGHT WHEEL WELL FWD BULKHEAD DOUBLER BY EXHAUST BETWEEN RBL 15 - RBL 25. IRW B737-700 SRM 51-30-01-0G-0 AND DWG # 111A1511;[02] LOCATED AND DRILLED NEW HOLES ON DOUBLER IRW B737-700 SRM 51-40-05-0G-0;[03] ADD ON STEP 1: MATERIAL USED 2024-0.040'' CLAD. PO# 1732885. PENDING HEAT TREAT.;[04] PERFORMED FPI ON JOGGLED WEB PRIOR HEAT TREATMENT. IAW BAC 5423 & BSS7039. NO CRACKS FOUND.;[05] PERFORMED FPI ON FABRICATED ANGLE PRIOR HEAT TREATMENT. IAW BAC 5423 & BSS7039. NO CRACKS FOUND.;[06] VERIFIED STEPS 1-3;[07] PERFORMED HEAT TREATMENT TO FABRICATED DOUBLER AS PER BAC 5602; ATTACHED AAR FORM OP 84; CONTROL TAG #400369.;[08] VERIFIED STEP 7. OK TO TREAT AND PRIME;[09] TREATED & PRIMED NEW DOUBLER AS PER B737-7 SRM 51-20-01-0G-0 & AMM 51-21-72-370-804.;[10] NEW DOUBLER WILL BE INSTALLED ON CARD:TTG8Q00B8QLC.;[11] VERIFIED STEPS 9 AND 10;[12] VERIFIED STEPS 9 AND 10

More about the Boeing 737-7H4