Service difficulty report · Relay · Boeing 767306

Difficulty date
August 9, 2019
Submitted
August 21, 2019
Operation
Air carrier
Aircraft
N1409A
Make and model
Boeing 767306
Aircraft serial
27960
Aircraft time
90,821 hours, 17,321 cycles
Part
Relay
Part number
MS274182B
Condition
Unknown
Location
Fuel Pump
Stage of operation
NR
How discovered
O
Nature of condition
N
Precautionary procedure
H

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

What was found

LEFT CENTER PUMP LOW PRESSURE LIGHT ILLUMINATED. TROUBLESHOT THE LEFT CENTER BOOST PUMP IAW FIM 28-22 FT 805, NO FAULTS NOTED. THE LEFT CENTER LIGHT STARTS FLASHING AROUND 1500 POUNDS, THIS IS NORMAL. RT CTR WILL PUMP TO .4 POUNDS. REOPENED ORIGINAL MDDR 116005. MX ACTION COMPLIED WITH NO FURTHER DEFECTS NOTED. PERFORMED A VISUAL INSPECTION, SHAKE DOWN OF LT AUX TANK BOOST PUMP WIRING IAW WDM 28-22-12, SHEET 1. FROM P6 PANEL CIRCUIT BREAKER C369 TO E/E P36 PANEL, PLUG D5894. NO WIRING DEFECTS NOTED. AS A PRECAUTION, R & R RELAY K633, LT PUMP OPS NORMAL, COULD NOT DUPLICATE FAILURE. RECOMMEND REPLACING RELAY K329, REMOVED AND REPLACED RELAY K329 IAW WD 28-22-12. OPS CHECKED NORMAL. REVERSED MAINTENANCE ACTION IAW DDG 28-22-02A. MONITORED LH FUEL PUMP FOR FUEL MIGRATION, NO MIGRATION NOTED.