SDR UALA2011030401062

Service difficulty report · Wire · Boeing 767322

Difficulty date: March 3, 2011
Submitted: March 17, 2011
Operation: Air carrier
Aircraft: N669UA
Make and model: Boeing 767322
Aircraft serial: 30025
Aircraft time: 42,542 hours, 11,245 cycles
Engine: Pwa PW4056
System (JASC): 7697 · Engine Control System Wiring
Part: Wire
Condition: Faulty
Location: Throttle
Stage of operation: DE
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

ON DESCENT AS THROTTLES RETARDED TO IDLE, WITH AUTO PILOT & AT OFF. SUPPLEMENTAL DATA UPDATE F/O FELT VIBRATION IN YOKE & RUDDER PEDALS SIMILAR TO STICK SHAKER. WHEN POWER ADVANCE VIB'S SUBSIDED, SAMC TEXT: PREVIOUS HISTORY INDICATES LEFT HPSOV CAUSING CONTROL COLUMN YOKE VIBRATIONS. INOP LEFT HPSOV PER MEL 3611Q. DEF LEFT ENGINE HIGH STAGE BLD VALVE IN THE CLOSED POSITION PER MEL 3611Q. WIRING CHANGE PER MEL PARAGRAPH B(1)-(4) NOT REQ'D. NOT AN INDICATION FAULT. NO VIBS NOTED ENROUTE LIM REPORTED.