Service difficulty report · Nut Plate · Boeing 737990ER

Difficulty date
June 19, 2019
Submitted
July 5, 2019
Operation
Air carrier
Aircraft
N479AS
Make and model
Boeing 737990ER
Aircraft serial
60576
Aircraft time
15,817 hours, 5,131 cycles
Engine
Cfmint CFM567B27E
Part
Nut Plate
Part number
9116M64P05
Condition
Corroded
Location
Nr 2 Engine
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

#2 ENG INLET AND FANBLADES - DETAILED INSPT. S/N 862264. FOUND 5 EACH NUT PLATES THAT HAVE CORROSION UNDER THEM ON R/H SIDE AFT END OF FAN FRAME. 1 EACH #3 ACOUSTICAL PANEL FWD MIDDLE NUT PLATE, 1 EACH #4 FWD R/H NUT PLATE ON #4 ACOUSTICAL PANEL, 2 EACH #5 ACOUSTICAL PANEL FWD MIDDLE AND FWD R/H NUT PLATES, 1 EACH #5 START FWD END OF PLASTIC PANEL. (M) ALF. ALL CORROSION IS ON FAN FRAME CASE. GROUNDED - YES. REMOVED 2 EA NUT PLATES @ #5 ACOUSTICAL PANEL REF B737-900 SRM 51-40-02 REMOVED 3 NUTPLATES 1 AT #3 ACOUSTICAL PANEL FWD MIDDLE NUT PLATE 1 AT #4 FWD R/H NUTPLATE AND 1 AT 5 START FWD END OF PLASTIC PANEL BLENDED CORROSION ALL NUT PLATE LOCATIONS #3 ACOUSTICAL PANEL FWD MIDDLE NUTPLATE HAS .148 #4 FWD R/H NUTPLATE .148 #5 PANEL FWD MIDDLE .156 #5 R/H .148 AND #5 START FWD END OF PLASTIC PANEL .158 REMAINING THICKNESS REF B737-900 AMM 72-23-05-300-805-F00.