SDR UALA2011030201028

Service difficulty report · Module · Boeing 757222

Difficulty date: February 28, 2011
Submitted: March 4, 2011
Operation: Air carrier
Aircraft: N545UA
Make and model: Boeing 757222
Aircraft serial: 25323
Aircraft time: 73,224 hours, 21,224 cycles
Engine: Pwa PW2037
System (JASC): 3418 · Stall Warning System
Part: Module
Condition: Faulty
Location: Stall Warning
Stage of operation: IN
How discovered: C
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

STALL WARNING OPS CHECK FAILS STEP B8, ALL OTHER STEPS CHECK OKAY. CAPT'S SIDE DOES NOT DISPLAY PITCH LIMIT INDICATOR AND NO STICK SHAKER WITH AIR DATA SWITCH IN ALT. FOUND 115V AC ON PIN 5 WITH SOURCE SWITCH IN ALT. FOUND 115V AC AT PIN 6 WITH SOURCE SWITCH IN NORMAL. MEASURED AT CONNECTOR D3925. SWAPPED STALL WARNING COMPUTERS, NO HELP. RETURNED TO ORIGINAL POSITIONS PER MM. REPLACED AIR DATA SOURCE SWITCH MASTER MODULE PER MM.