Service difficulty report · Resistor · Boeing 7879

Difficulty date
January 7, 2026
Submitted
January 12, 2026
Operation
Air carrier
Aircraft
N27959
Make and model
Boeing 7879
Aircraft serial
36407
Aircraft time
48,772 hours, 4,660 cycles
Part
Resistor
Part number
70000290231
Condition
Burned
Location
Zone 200
Stage of operation
IN
How discovered
V
Nature of condition
M
Precautionary procedure
K

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

What was found

MANY STATUS MSGS NITRO GEN SYS ELEC ENG START R2. FOUND R2 ATRUC TRIPPED ON ESIC. PRESENT LEG FAULT MAINTENCE MSG 24-17504 RELATED TO THE MULTIPLE STATUS MESSAGES. FOUND R2 SOFT START RESISTOR (R2 SSRA) BURNED (DAMAGED) IN THE P200 PANEL. FOLLOWED FIM 24-30-F5-69A-421A. (MSG 24-17504). STARTED REMOVAL OF RESISTOR - UNABLE TO SEPERATE FROM CONNECTOR. ADDED PHOTOS OF DAMAGED RESISTOR. ALL PARTS BAGGED AND TIED TO AREA. PLACED NEW PART TAPED TO P200 PANEL. REMOVED R2 SOFT START RESISTOR ASSEMBLY, M2409024, FROM P200 PANEL. SOCKET LOCK ASSY DAMAGED AT POSITION NR 1. SOFT START RESISTOR, 15 AMP CONTACTOR & CONTACTOR LOCATED ON R&E DESK. RESISTOR, PPDS, SOFT START, M&E 78-2400-3-0030 FOUND BURNED. REMOVED WIRE FROM R2 SOFT START RESISTOR CONNECTOR AT POSITION NR 2 DUE TO INTERNAL HEAT DAMAGE. REPLACED P200 SOFT START RESISTOR ASSEMBLY IN REF TO DMC-B787-A-24-15-09-00A-520A-A, AND INSTALLED NEW CONTACT ON WIRE W100206-00027-16 REF DMC-B787-A-24-35-22-02A-051A-D AND SWPM 20-52-99, OPS CHECK GOOD. STATUS MESSAGES CLEARED, NORMAL ADD EMP:U138152 INDICATIONS ON ESIC PAGE. NO ACTIVE FAULTS AT THIS TIME.

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