SDR ASAA2020112833667

Service difficulty report · Skin · Boeing 737990

Difficulty date: November 28, 2020
Submitted: December 17, 2020
Operation: Air carrier
Aircraft: N317AS
Make and model: Boeing 737990
Aircraft serial: 30856
Aircraft time: 58,936 hours, 23,590 cycles
System (JASC): 5512 · Horizontal Stabilizer, Plate/Skin
Part: Skin
Part number: 182A40011
Condition: Cracked
Location: Horizontal Stab
Stage of operation: IN
How discovered: E
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

LT HORIZONTAL LOWER SKIN HAS A CRACK AT STA 125 AT REAR SPAR, DOT A-154-002. GROUNDED-YES. REPAIRED LOWER STAB SKIN, IAW 737-900 SRM 55-10-01-2R-11. THIS IS A CAT B REPAIR WITH AN INSPECTION THRESHOLD OF 56,000 TOTAL FLT CYCLES & INSPECTION INTERVAL OF 9,000 FLR CYCLES TOTAL A/C FLT CYCLES AT TIME OF REPAIR 23,590.