SDR 2007UALA00458

Service difficulty report · Ram Air Turb · Boeing 757222

Difficulty date: February 13, 2007
Submitted: February 21, 2007
Operation: Air carrier
Aircraft: N508UA
Make and model: Boeing 757222
Aircraft serial: 24744
Aircraft time: 55,851 hours, 19,318 cycles
Engine: Pwa PW2037
System (JASC): 2920 · Hydraulic System, Auxiliary
Part: Ram Air Turb
Condition: Unwanted Extend
Stage of operation: IN
How discovered: V
Nature of condition: O
Precautionary procedure: O

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

What was found

DURING WALK AROUND NOTICED RAT IN THE FULLY EXTENDED POSITION. STILL WIRED SHUT IN COCKPIT. REPLACED RAM AIR TURBINE AIRSPEED SWITCH, SYSTEM 1 AIR GRND RELAY, AND RAT TIME DELAY MODULE, TRANSFERRED APU TO EXTERNAL PWR, COULD NOT DUPLICATE FAULT, VERIFIED NO VOLTAGE AT RAT CNTRL VALVE WITH MANUAL SWITCH OFF, CYCLED SWITCH AND POWER CHECKS OK. ACCOMPISHED INPECTION AND STOWING OF RAM AIR TURBINE.