SDR UALA2012041702315

Service difficulty report · Proximity Switch · Boeing 767322

Difficulty date: April 16, 2012
Submitted: June 15, 2012
Operation: Air carrier
Aircraft: N676UA
Make and model: Boeing 767322
Aircraft serial: 30028
Aircraft time: 40,910 hours, 10,200 cycles
Engine: Pwa PW4052
System (JASC): 2781 · Leading Edge Slat Position Indicating System
Part: Proximity Switch
Condition: Faulted
Location: Slat System
Stage of operation: IN
How discovered: 9
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

BITE PSEU FAULTING SENSOR 294 SLAT NR 12 LEADING EDGE SENSOR. ACCOMPLISHED TROUBLESHOOTING PER MM 27-88-00 PG 901. CHECKED RESISTANCE OF SENSOR 8-935-01 SHOULD BE 16-18 OHMS BUT IT READS 23 OHMS. REF WDM 27-88-22 SH2 CHECKED RESISTANCE BETWEEN PINS AT CONNECTOR D2166A H15 AND G15 AND FOUND RESISTANCE TO BE HIGH. GAP ON S294 FOUND OK, REF WDM 27-88-22 SHT2, CHECKED WIRES BETWEEN CONNECTORS D4378P & D2166A PINS 11 & 12. CHECKED WIRES BETWEEN CONNECTORS D4378J & SP 226, SP228, GOOD. REPLACED S294 PROXIMITY SWITCH PER MM.