SDR UALA2011081904421

Service difficulty report · Control Valve · Boeing 757222

Difficulty date: August 18, 2011
Submitted: September 6, 2011
Operation: Air carrier
Aircraft: N548UA
Make and model: Boeing 757222
Aircraft serial: 25396
Aircraft time: 74,829 hours, 21,637 cycles
Engine: Pwa PW2037
System (JASC): 2750 · Trailing Edge Flap Control System
Part: Control Valve
Part number: 340545
Part serial: 6180
Condition: Faulty
Location: Te Flap
Stage of operation: NR
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

T/E FLAP VIBRATION. VIBRATES FROM 5 TO 1 DEG. REPLACED TRAILING EDGE PDU CONTROL VALVE (P/N S251N404-2; S/N 88), BYPASS VALVE, SHUTOFF VALVE, NO HELP. TE FLAP POWER DRIVE UNIT REPLACED (P/N S251N404-2 - DASH# 88) AND TE PDU CONTROL VLV, BYPASS VLV SHUTOFF VLV REPLACED, FLAPS OPERATE NORMAL WITH NO VIBRATION OR HUM.