SDR UALA2011080103968

Service difficulty report · Probe · Boeing 777222

Difficulty date: August 1, 2011
Submitted: September 6, 2011
Operation: Air carrier
Aircraft: N793UA
Make and model: Boeing 777222
Aircraft serial: 26946
Aircraft time: 62,180 hours, 9,011 cycles
Engine: Pwa PW40903
System (JASC): 2842 · Fuel Quantity Sensor
Part: Probe
Condition: Faulty
Location: Fuel Tank
Stage of operation: IN
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

PRIOR TO DEPT, CTR FUEL QTY DROPPED 20K LBS. RESET CB FOR PROCESSOR AND QTY READS OK BUT DENSIOMETER READING STILL BLANK. VERIFIED QTY WITH STICKS. FUEL UPLIFT READINGS OK. RPL CTR TANK DENS PER MM. NEEDS FQPU OPS CHECK AND FQIS OPS CHECK. PERFORMED FQIS OPS CHK, CHECK GOOD. REF DF948, RECOMMEND REPLACING PROBE NR 3 IN RT CTR TANK. M28249 TANK UNIT SIGNAL IS OUT OF RANGE. RPLC'D PROBE NR 3 IN RH CTR TANK. NEED TO ACC TASK 28-41-00-710-801 & 28-41-00-710-802. PERFORMED FQIS OPS CK REF MM, CHKS GOOD.