Service difficulty report · Processor · Boeing 7377H4

Difficulty date
October 18, 2025
Submitted
June 5, 2026
Operation
Air carrier
Aircraft
N479WN
Make and model
Boeing 7377H4
Aircraft serial
33990
Aircraft time
70,135 hours, 42,348 cycles
Part
Processor
Condition
Leaking
Location
Zone 600
Stage of operation
CR
How discovered
V
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

SUSPECTED FUEL LEAK. ALSO FUEL IMBALANCE RT SIDE FIRST THEN LEFT SIDE. 5.8 AT GATE IN JAX. SUPPOSED TO LAND WITH 6.6 IN MCO. ALSO HAD 6.3 AT GATE IN JAX. IT NOW STATES 5.7 (6.6). NH 30 DAYS. ACCOMPD GVI OF MAIN WING & CENTER TANKS PER AMM 28-11-00; NO LEAKS NOTED. ACCOMPD TANK FQIS TO STICK COMPARISON CHK PER AMM 28-41-00; FOUND NR 2 MAIN TANK OUT OF TOLERANCE. OK TO CONTINUE PER MEL 28-6-01. PERFORMED TANK & COMPENSATOR UNITS - FUEL QTY IND SYS HEALTH CHK IAW AMM 28-41-21 & FOUND TANK UNIT 7 BELOW NORMAL READING. R & R FUEL QTY PROCESSOR IAW AMM 28-41-81. FUEL QTY PROCESSOR UNIT INSTALL TEST REQUIRED. PERFORMED FUEL QTY PROCESSOR UNIT INSTALL TEST PER AMM 28-41-81; NO DEFECTS NOTED AT THIS TIME. R&R RT WNG FUEL QTY COMP & F3, F4, F5, F6, F7, & F8 FUEL QTY UNITS. RT WNG FUEL QTY OPS CHKD GOOD IAW AMM 28-41-21.

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