Service difficulty report · Turbine Exh · Boeing 747124

Difficulty date
May 27, 1996
Submitted
March 26, 2000
Operation
Air carrier
Aircraft
N855FT
Make and model
Boeing 747124
Aircraft serial
19733
Engine
Pwa JT9D7A
Part
Turbine Exh
Condition
Cracked
Location
Nr 3 Engine
Stage of operation
IN
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

NR 3 ENGINE 'R' AND 'S' RAILS CRACKED IN PREVIOUS WELDED AREAS AT 12 O'CLOCK POSITION. THE 'S' FLANGE CLEVIS PIN HAS PINHOLE CRACK, THE 'R' FLANGE 12 O'CLOCK RACETRACK SLOT RADIAL CRACK TO RAIL. INSPECTED TURBINE EXHAUST CASE AT 1,000 HR INTERVALS FOLLOWING DISCOVERY OF INITIAL CRACK INDICATION TO ENSURE ABOVE LIMITS HAVE NOT BEEN EXCEEDED.