SDR UIEA200700301

Service difficulty report · Threshold · Boeing 747271C

Difficulty date: July 26, 2007
Submitted: August 24, 2007
Operation: Air carrier
Aircraft: N537MC
Make and model: Boeing 747271C
Aircraft serial: 22403
Aircraft time: 97,429 hours, 19,113 cycles
System (JASC): 5320 · Fuselage Miscellaneous Structure
Part: Threshold
Condition: Cracked
Location: Zone 200
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

CRACK NOTED AT SKIN 1.75" IN LENGTH. CRACK NOTED IN BEARSTRAP AT SAME LOCATION 1.75" IN LENGTH. CRACK TERMINATES AT FASTENER HOLE. REMOVED EXISTING DOUBLER AT CRACK TERMINATION HOLE. REAMED HOLE .100 OVERSIZED. FABRICATED AND INSTALLED FREEZE PLUG DRILLED UP AND INSTALLED LARGE STEEL DOUBLER WHICH IS PART OF KIT NR 65B25848-9 ALONG WITH NEW STAINLESS STEEL THRESHOLD THEN REINSTALLED ALL PARTS IAW SB 747-53A2552.