SDR ASAA2020082433050

Service difficulty report · Skin · Boeing 737890

Difficulty date: August 4, 2020
Submitted: August 24, 2020
Operation: Air carrier
Aircraft: N559AS
Make and model: Boeing 737890
Aircraft serial: 35178
Aircraft time: 50,233 hours, 14,846 cycles
System (JASC): 5330 · Fuselage Main, Plate/Skin
Part: Skin
Part number: 147A34004
Condition: Corroded
Location: Bs 907-927
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

AIRCRAFT SKIN CORRODED AROUND LAV EXHAUST VENT. GROUNDED - YES. REMOVED DAMAGE AND CHECKED LIMITS. ORIGINAL THICKNESS IS .125, REMAINING IS .098, .027 WAS REMOVED. FOUND TO BE OUT OF LIMITS, REF B737-800 SRM 53-00-01-1A-1. CUTOUT DAMAGE AND REPAIRED SKIN, REF B737-800 SRM 53-70-01-2R-3. THIS IS A CATEGORY "B" REPAIR WITH AN INSPECTION THRESHOLD OF 50,000 FLIGHT CYCLES.