SDR AALA201904059020

Service difficulty report · Valve · Boeing 777223

Difficulty date: February 6, 2019
Submitted: April 5, 2019
Operation: Air carrier
Aircraft: N776AN
Make and model: Boeing 777223
Aircraft serial: 29582
Aircraft time: 80,592 hours, 9,751 cycles
System (JASC): 2820 · Aircraft Fuel Distribution System
Part: Valve
Condition: Faulty
Location: Fuel System
Stage of operation: NR
How discovered: 9
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

AIRCRAFT WAS GROUNDED: 1 HOUR AND 30 MINUTES INTO FLIGHT RIGHT FUEL TANK INDICATED 2600 LESS THAN LEFT TANK. CENTER TANK WAS SUPPLYING, TOTALIZER NORMAL AND FUEL BURN SYMETRIC. AIRCRAFT WAS LEFT WING HEAVY, SUSPECT WEAK RIGHT CENTER PUMP. MAINTENANCE REPLACED CENTER TANK RIGHT HAND REFUEL VALVE IAW AMM 28-21-02, REPLACED CENTER TANK RIGHT HAND DEFUEL VALVE IAW AMM 28-26-01, REPLACED CENTER TANK RIGHT HAND #6 FQIS TANK UNIT AMM 28-41-02 AND PERFORMED SATISFACTORY OPERATIONAL CHECK.