SDR ASAA2021012233963

Service difficulty report · Transition Panel · Boeing 737990ER

Difficulty date: January 22, 2021
Submitted: January 30, 2021
Operation: Air carrier
Aircraft: N477AS
Make and model: Boeing 737990ER
Aircraft serial: 40716
Aircraft time: 20,166 hours, 6,321 cycles
System (JASC): 5310 · Fuselage Main, Structure
Part: Transition Panel
Part number: 146A750241
Condition: Corroded
Location: Aft Pit Floor
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

AFT PIT FLOOR TRANSITION PANEL LT SIDE BETWEEN STA 727I & J- STA 797 HAVE CORROSION AROUND FASTENER HOLES. GROUNDED-YES. REMOVED CORROSION ORG THICKNESS .040, PER B737-900ER SRM 53-60-53-01-2. REMOVED .008 MATERIAL OUT OF LIMITS, PER B737-900ER SRM 53-00-53-1A-2. REMOVED, FABRICATED, AND INSTALLED, PER B737-900ER SRM 53-00-53-2R-5.