SDR ASAA2013070295451

Service difficulty report · Counterweight · Boeing 737890

Difficulty date: July 2, 2013
Submitted: July 5, 2013
Operation: Air carrier
Aircraft: N570AS
Make and model: Boeing 737890
Aircraft serial: 35185
Aircraft time: 24,498 hours, 7,300 cycles
System (JASC): 7200 · Engine (Turbine/Turboprop)
Part: Counterweight
Part number: 3013156250
Condition: Failed
Location: Nr1 Engine
Stage of operation: CR
How discovered: O
Nature of condition: E
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

LT ENGINE VIBRATION AT CRUISE 1.1, N,86.1 LT & RT. ACFT GROUNDED. ACCOMPLISHED TEST 14B FAN TRIM BALANCE NR 1 ENGINE SOULTION POS 13, REMOVE P-14 INSTALLED P09, POS 15, REMOVED P-14 INSTALLED P09, POS 21. REMOVED P-08, INSTALLED P-14, POS 28. REMOVED P08 INSTALLED P-14, AND PERFORMED ENGINE VIBRATION SURVAY (TEST 7) IAW AMM 71-00-00, AMM 71-00-00-700-814 F00. ENGINE CHECKS WITHIN OPERATING LIMITS AND VIRBRATION LIMITS.