SDR DALA2026050702909

Service difficulty report · Intercostal · Boeing 757351

Difficulty date: May 6, 2026
Submitted: May 7, 2026
Operation: Air carrier
Aircraft: N585NW
Make and model: Boeing 757351
Aircraft serial: 32985
Aircraft time: 78,886 hours, 26,159 cycles
System (JASC): 5320 · Fuselage Miscellaneous Structure
Part: Intercostal
Condition: Out Of Limits
Location: Zone 100
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

IN REFERENCE NRC 00185: CORROSION OUT OF LIMITS, THICKNESS MEASURE WAS ACOMPLISHED ON INTERCOSTALS BTW STA 1500 TO STA 1521 AND S30-S29L PER B757-300 SRM 53-00-04-1A PROCEDURE 1, NOTE F, DETAIL II. COROSION LEVEL 2. INTERCOSTALS BTW STA 1500 TO STA 1521 AND S30-S29L WAS REPLACED PER B757-300 SRM 51- 40-02-0G PAR 7, D.(1580815) AIRCRAFT WAS GROUNDED