Service difficulty report · Compensator · Boeing 737890

Difficulty date
February 17, 2023
Submitted
February 22, 2023
Operation
Air carrier
Aircraft
N530AS
Make and model
Boeing 737890
Aircraft serial
36578
Aircraft time
45,777 hours, 13,340 cycles
Part
Compensator
Part number
2020202
Part serial
12167
Condition
Faulty
Location
Right Main Tank
Part time
37,311 hours, 10,819 cycles
Stage of operation
CR
How discovered
V
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

AFTER CENTER TANK EMPTY & CENTER FUEL PUMPS OFF APPROX 10 MINS LATER RT TANK FUEL QTY 1060 LB LESS THAN LT. BECAUSE TOTAL FUEL QTY REFLECTED AS PLANNED, FUEL LEAK WAS NOT SUSPECTED & BALANCED FUEL VIA CROSSFEED. RT QTY CONTINUED TO DECREASE 100 LB OVER 25 MINS COMPARED TO LT. #1 ENG FUEL USED 6.52, #2 USED 6.42 UPON BLOCK IN. GROUNDED. ACCOMP TANK & COMPENSATOR UNIT RESISTANCE & CAPACITANCE CHECKS, FOUND COMPENSATOR & 6 TANK UNITS BAD IAW AMM 28-41-21-710-801. REPLACED TANK UNITS 4 THROUGH 8 IAW AMM 28-41-21/401. REPLACED COMP PROBE, TU'S 1, 2, 3, REF AMM 28-41-21. TANK & COMP UNITS TEST NOW CHECKS GOOD. ALL VALUES ARE WITHIN LIMITS REF AMM 28-41-21/501. #2 FQIS TEST GOOD REF AMM TASK 28-41-00-730-801.