Service difficulty report · Tank Unit · Boeing 7377H4

Difficulty date
July 24, 2026
Submitted
July 29, 2026
Operation
Air carrier
Aircraft
N250WN
Make and model
Boeing 7377H4
Aircraft serial
34972
Aircraft time
65,186 hours, 39,629 cycles
Part
Tank Unit
Part number
202000207
Part serial
786422
Condition
Leaking
Location
Zone 600
Stage of operation
CL
How discovered
O
Nature of condition
K
Precautionary procedure
O

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

What was found

INFLIGHT, NR 2 FUEL IMBALANCE CLIMBING THROUGH FL 250, NOTICED NR 2 FUEL QTY DECREASE BELOW NR 1 ENG QTY. FUEL IMBALANCE WAS GREATER THAN 3,000LBS. CREW RAN QRH & SHUTDOWN ENG. ON ACFT REACHING GATE, INSPECTED ACFT FOR OBVIOUS SIGNS OF A FUEL LEAK IAW AMM 28-11-00. FOUND NO OBVIOUS SIGNS OF A FUEL LEAK FROM RT ENGINE, RT WING OR WHEEL WELL AREAS. CHKD FUEL QTY AT REFUEL/DEFUEL PANEL. LT WING HAD 6260 & RT WING 3910 CENTER READ ZERO. CHKD FUEL QTY ON EICAS, FOUND TO BE CONSISTENT WITH FUEL PANEL. TRANSFERED LT WING TO RT, TO ABOUT EVEN. PERFORMED FQIS BITE TEST IAW FIM 28-41, TASK 801. FOUND NO FAULTS STORED OR CURRENT FAULTS. PERFORMED NR 1 & 2 ENG RUNS IAW AMM 72-00-00, FOR 5 MINS. FOUND NO ABNORMAL FUEL FLUCTUATIONS & NO LEAKS NOTED AFTER SHUTDOWN. PERFORMED FUEL MEASURING STICK READINGS WHEN TANKS WERE ABOUT EVEN GOT STICK 4 ON RT TO READ ABOUT 5.4 WITHIN LIMITS. TRANSFERRED FUEL BACK TO ORIGINAL NUMBRS AT ARRIVAL TO GATE AND STICK 3 TO READ 11.2, WITHIN LIMITS OF SP#28 OF MEL 28-6-01.R & R RT WING TANK COMPENSATOR & TANK UNITS , F2, F3, & F5 IAW AMM 28-41-21

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