Service difficulty report · Isolator · Boeing 747422

Difficulty date
November 6, 2013
Submitted
November 8, 2013
Operation
Air carrier
Aircraft
N181UA
Make and model
Boeing 747422
Aircraft serial
25278
Aircraft time
92,437 hours, 11,121 cycles
Engine
Pwa PW4056
Part
Isolator
Condition
Deteriorated
Location
Apu Mount
Component
Apu
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

APU RT FWD MOUNT ISOLATOR RUBBER DETERIORATED & CRACKED. REPLACED THE RT FWD MOUNT ISOLATOR. REPLACED THE APUC, NEED TO REPLACE THE APU DUE CHRONIC NO START. REMOVED & INSTALLED APU IAW TOD-49-11-01-401 UP TO TASK-764-102. DURING APU STARTING, APU SURGES & SHUTDOWN WITH BLEED AIR ON.